scripts/checkpatch.pl

   1 #!/usr/bin/perl -w
   2 # (c) 2001, Dave Jones. (the file handling bit)
   3 # (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
   4 # (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
   5 # (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
   6 # Licensed under the terms of the GNU GPL License version 2
   7
   8 use strict;
   9
  10 my $P = $0;
  11 $P =~ s@.*/@@g;
  12
  13 my $V = '0.32';
  14
  15 use Getopt::Long qw(:config no_auto_abbrev);
  16
  17 my $quiet = 0;
  18 my $tree = 1;
  19 my $chk_signoff = 1;
  20 my $chk_patch = 1;
  21 my $tst_only;
  22 my $emacs = 0;
  23 my $terse = 0;
  24 my $file = 0;
  25 my $check = 0;
  26 my $summary = 1;
  27 my $mailback = 0;
  28 my $summary_file = 0;
  29 my $show_types = 0;
  30 my $root;
  31 my %debug;
  32 my %ignore_type = ();
  33 my @ignore = ();
  34 my $help = 0;
  35 my $configuration_file = ".checkpatch.conf";
  36 my $max_line_length = 80;
  37
  38 sub help {
  39         my ($exitcode) = @_;
  40
  41         print << "EOM";
  42 Usage: $P [OPTION]... [FILE]...
  43 Version: $V
  44
  45 Options:
  46   -q, --quiet                quiet
  47   --no-tree                  run without a kernel tree
  48   --no-signoff               do not check for 'Signed-off-by' line
  49   --patch                    treat FILE as patchfile (default)
  50   --emacs                    emacs compile window format
  51   --terse                    one line per report
  52   -f, --file                 treat FILE as regular source file
  53   --subjective, --strict     enable more subjective tests
  54   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  55   --max-line-length=n        set the maximum line length, if exceeded, warn
  56   --show-types               show the message "types" in the output
  57   --root=PATH                PATH to the kernel tree root
  58   --no-summary               suppress the per-file summary
  59   --mailback                 only produce a report in case of warnings/errors
  60   --summary-file             include the filename in summary
  61   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
  62                              'values', 'possible', 'type', and 'attr' (default
  63                              is all off)
  64   --test-only=WORD           report only warnings/errors containing WORD
  65                              literally
  66   -h, --help, --version      display this help and exit
  67
  68 When FILE is - read standard input.
  69 EOM
  70
  71         exit($exitcode);
  72 }
  73
  74 my $conf = which_conf($configuration_file);
  75 if (-f $conf) {
  76         my @conf_args;
  77         open(my $conffile, '<', "$conf")
  78             or warn "$P: Can't find a readable $configuration_file file $!\n";
  79
  80         while (<$conffile>) {
  81                 my $line = $_;
  82
  83                 $line =~ s/\s*\n?$//g;
  84                 $line =~ s/^\s*//g;
  85                 $line =~ s/\s+/ /g;
  86
  87                 next if ($line =~ m/^\s*#/);
  88                 next if ($line =~ m/^\s*$/);
  89
  90                 my @words = split(" ", $line);
  91                 foreach my $word (@words) {
  92                         last if ($word =~ m/^#/);
  93                         push (@conf_args, $word);
  94                 }
  95         }
  96         close($conffile);
  97         unshift(@ARGV, @conf_args) if @conf_args;
  98 }
  99
 100 GetOptions(
 101         'q|quiet+'      => \$quiet,
 102         'tree!'         => \$tree,
 103         'signoff!'      => \$chk_signoff,
 104         'patch!'        => \$chk_patch,
 105         'emacs!'        => \$emacs,
 106         'terse!'        => \$terse,
 107         'f|file!'       => \$file,
 108         'subjective!'   => \$check,
 109         'strict!'       => \$check,
 110         'ignore=s'      => \@ignore,
 111         'show-types!'   => \$show_types,
 112         'max-line-length=i' => \$max_line_length,
 113         'root=s'        => \$root,
 114         'summary!'      => \$summary,
 115         'mailback!'     => \$mailback,
 116         'summary-file!' => \$summary_file,
 117
 118         'debug=s'       => \%debug,
 119         'test-only=s'   => \$tst_only,
 120         'h|help'        => \$help,
 121         'version'       => \$help
 122 ) or help(1);
 123
 124 help(0) if ($help);
 125
 126 my $exit = 0;
 127
 128 if ($#ARGV < 0) {
 129         print "$P: no input files\n";
 130         exit(1);
 131 }
 132
 133 @ignore = split(/,/, join(',',@ignore));
 134 foreach my $word (@ignore) {
 135         $word =~ s/\s*\n?$//g;
 136         $word =~ s/^\s*//g;
 137         $word =~ s/\s+/ /g;
 138         $word =~ tr/[a-z]/[A-Z]/;
 139
 140         next if ($word =~ m/^\s*#/);
 141         next if ($word =~ m/^\s*$/);
 142
 143         $ignore_type{$word}++;
 144 }
 145
 146 my $dbg_values = 0;
 147 my $dbg_possible = 0;
 148 my $dbg_type = 0;
 149 my $dbg_attr = 0;
 150 for my $key (keys %debug) {
 151         ## no critic
 152         eval "\${dbg_$key} = '$debug{$key}';";
 153         die "$@" if ($@);
 154 }
 155
 156 my $rpt_cleaners = 0;
 157
 158 if ($terse) {
 159         $emacs = 1;
 160         $quiet++;
 161 }
 162
 163 if ($tree) {
 164         if (defined $root) {
 165                 if (!top_of_kernel_tree($root)) {
 166                         die "$P: $root: --root does not point at a valid tree\n";
 167                 }
 168         } else {
 169                 if (top_of_kernel_tree('.')) {
 170                         $root = '.';
 171                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 172                                                 top_of_kernel_tree($1)) {
 173                         $root = $1;
 174                 }
 175         }
 176
 177         if (!defined $root) {
 178                 print "Must be run from the top-level dir. of a kernel tree\n";
 179                 exit(2);
 180         }
 181 }
 182
 183 my $emitted_corrupt = 0;
 184
 185 our $Ident      = qr{
 186                         [A-Za-z_][A-Za-z\d_]*
 187                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 188                 }x;
 189 our $Storage    = qr{extern|static|asmlinkage};
 190 our $Sparse     = qr{
 191                         __user|
 192                         __kernel|
 193                         __force|
 194                         __iomem|
 195                         __must_check|
 196                         __init_refok|
 197                         __kprobes|
 198                         __ref|
 199                         __rcu
 200                 }x;
 201
 202 # Notes to $Attribute:
 203 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 204 our $Attribute  = qr{
 205                         const|
 206                         __percpu|
 207                         __nocast|
 208                         __safe|
 209                         __bitwise__|
 210                         __packed__|
 211                         __packed2__|
 212                         __naked|
 213                         __maybe_unused|
 214                         __always_unused|
 215                         __noreturn|
 216                         __used|
 217                         __cold|
 218                         __noclone|
 219                         __deprecated|
 220                         __read_mostly|
 221                         __kprobes|
 222                         __(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
 223                         ____cacheline_aligned|
 224                         ____cacheline_aligned_in_smp|
 225                         ____cacheline_internodealigned_in_smp|
 226                         __weak
 227                   }x;
 228 our $Modifier;
 229 our $Inline     = qr{inline|__always_inline|noinline};
 230 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 231 our $Lval       = qr{$Ident(?:$Member)*};
 232
 233 our $Float_hex  = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
 234 our $Float_dec  = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
 235 our $Float_int  = qr{(?i)[0-9]+e-?[0-9]+[fl]?};
 236 our $Float      = qr{$Float_hex|$Float_dec|$Float_int};
 237 our $Constant   = qr{$Float|(?i)(?:0x[0-9a-f]+|[0-9]+)[ul]*};
 238 our $Assignment = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
 239 our $Compare    = qr{<=|>=|==|!=|<|>};
 240 our $Operators  = qr{
 241                         <=|>=|==|!=|
 242                         =>|->|<<|>>|<|>|!|~|
 243                         &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
 244                   }x;
 245
 246 our $NonptrType;
 247 our $Type;
 248 our $Declare;
 249
 250 our $NON_ASCII_UTF8     = qr{
 251         [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
 252         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 253         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 254         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 255         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 256         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 257         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 258 }x;
 259
 260 our $UTF8       = qr{
 261         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 262         | $NON_ASCII_UTF8
 263 }x;
 264
 265 our $typeTypedefs = qr{(?x:
 266         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 267         atomic_t
 268 )};
 269
 270 our $logFunctions = qr{(?x:
 271         printk(?:_ratelimited|_once|)|
 272         [a-z0-9]+_(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
 273         WARN(?:_RATELIMIT|_ONCE|)|
 274         panic|
 275         MODULE_[A-Z_]+
 276 )};
 277
 278 our $signature_tags = qr{(?xi:
 279         Signed-off-by:|
 280         Acked-by:|
 281         Tested-by:|
 282         Reviewed-by:|
 283         Reported-by:|
 284         To:|
 285         Cc:
 286 )};
 287
 288 our @typeList = (
 289         qr{void},
 290         qr{(?:unsigned\s+)?char},
 291         qr{(?:unsigned\s+)?short},
 292         qr{(?:unsigned\s+)?int},
 293         qr{(?:unsigned\s+)?long},
 294         qr{(?:unsigned\s+)?long\s+int},
 295         qr{(?:unsigned\s+)?long\s+long},
 296         qr{(?:unsigned\s+)?long\s+long\s+int},
 297         qr{unsigned},
 298         qr{float},
 299         qr{double},
 300         qr{bool},
 301         qr{struct\s+$Ident},
 302         qr{union\s+$Ident},
 303         qr{enum\s+$Ident},
 304         qr{${Ident}_t},
 305         qr{${Ident}_handler},
 306         qr{${Ident}_handler_fn},
 307 );
 308 our @modifierList = (
 309         qr{fastcall},
 310 );
 311
 312 our $allowed_asm_includes = qr{(?x:
 313         irq|
 314         memory
 315 )};
 316 # memory.h: ARM has a custom one
 317
 318 sub build_types {
 319         my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
 320         my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
 321         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 322         $NonptrType     = qr{
 323                         (?:$Modifier\s+|const\s+)*
 324                         (?:
 325                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
 326                                 (?:$typeTypedefs\b)|
 327                                 (?:${all}\b)
 328                         )
 329                         (?:\s+$Modifier|\s+const)*
 330                   }x;
 331         $Type   = qr{
 332                         $NonptrType
 333                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*|\[\])+|(?:\s*\[\s*\])+)?
 334                         (?:\s+$Inline|\s+$Modifier)*
 335                   }x;
 336         $Declare        = qr{(?:$Storage\s+)?$Type};
 337 }
 338 build_types();
 339
 340
 341 our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
 342
 343 # Using $balanced_parens, $LvalOrFunc, or $FuncArg
 344 # requires at least perl version v5.10.0
 345 # Any use must be runtime checked with $^V
 346
 347 our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
 348 our $LvalOrFunc = qr{($Lval)\s*($balanced_parens{0,1})\s*};
 349 our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)};
 350
 351 sub deparenthesize {
 352         my ($string) = @_;
 353         return "" if (!defined($string));
 354         $string =~ s@^\s*\(\s*@@g;
 355         $string =~ s@\s*\)\s*$@@g;
 356         $string =~ s@\s+@ @g;
 357         return $string;
 358 }
 359
 360 $chk_signoff = 0 if ($file);
 361
 362 my @rawlines = ();
 363 my @lines = ();
 364 my $vname;
 365 for my $filename (@ARGV) {
 366         my $FILE;
 367         if ($file) {
 368                 open($FILE, '-|', "diff -u /dev/null $filename") ||
 369                         die "$P: $filename: diff failed - $!\n";
 370         } elsif ($filename eq '-') {
 371                 open($FILE, '<&STDIN');
 372         } else {
 373                 open($FILE, '<', "$filename") ||
 374                         die "$P: $filename: open failed - $!\n";
 375         }
 376         if ($filename eq '-') {
 377                 $vname = 'Your patch';
 378         } else {
 379                 $vname = $filename;
 380         }
 381         while (<$FILE>) {
 382                 chomp;
 383                 push(@rawlines, $_);
 384         }
 385         close($FILE);
 386         if (!process($filename)) {
 387                 $exit = 1;
 388         }
 389         @rawlines = ();
 390         @lines = ();
 391 }
 392
 393 exit($exit);
 394
 395 sub top_of_kernel_tree {
 396         my ($root) = @_;
 397
 398         my @tree_check = (
 399                 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
 400                 "README", "Documentation", "arch", "include", "drivers",
 401                 "fs", "init", "ipc", "kernel", "lib", "scripts",
 402         );
 403
 404         foreach my $check (@tree_check) {
 405                 if (! -e $root . '/' . $check) {
 406                         return 0;
 407                 }
 408         }
 409         return 1;
 410 }
 411
 412 sub parse_email {
 413         my ($formatted_email) = @_;
 414
 415         my $name = "";
 416         my $address = "";
 417         my $comment = "";
 418
 419         if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
 420                 $name = $1;
 421                 $address = $2;
 422                 $comment = $3 if defined $3;
 423         } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
 424                 $address = $1;
 425                 $comment = $2 if defined $2;
 426         } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
 427                 $address = $1;
 428                 $comment = $2 if defined $2;
 429                 $formatted_email =~ s/$address.*$//;
 430                 $name = $formatted_email;
 431                 $name =~ s/^\s+|\s+$//g;
 432                 $name =~ s/^\"|\"$//g;
 433                 # If there's a name left after stripping spaces and
 434                 # leading quotes, and the address doesn't have both
 435                 # leading and trailing angle brackets, the address
 436                 # is invalid. ie:
 437                 #   "joe smith joe@smith.com" bad
 438                 #   "joe smith <joe@smith.com" bad
 439                 if ($name ne "" && $address !~ /^<[^>]+>$/) {
 440                         $name = "";
 441                         $address = "";
 442                         $comment = "";
 443                 }
 444         }
 445
 446         $name =~ s/^\s+|\s+$//g;
 447         $name =~ s/^\"|\"$//g;
 448         $address =~ s/^\s+|\s+$//g;
 449         $address =~ s/^\<|\>$//g;
 450
 451         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 452                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 453                 $name = "\"$name\"";
 454         }
 455
 456         return ($name, $address, $comment);
 457 }
 458
 459 sub format_email {
 460         my ($name, $address) = @_;
 461
 462         my $formatted_email;
 463
 464         $name =~ s/^\s+|\s+$//g;
 465         $name =~ s/^\"|\"$//g;
 466         $address =~ s/^\s+|\s+$//g;
 467
 468         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 469                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 470                 $name = "\"$name\"";
 471         }
 472
 473         if ("$name" eq "") {
 474                 $formatted_email = "$address";
 475         } else {
 476                 $formatted_email = "$name <$address>";
 477         }
 478
 479         return $formatted_email;
 480 }
 481
 482 sub which_conf {
 483         my ($conf) = @_;
 484
 485         foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
 486                 if (-e "$path/$conf") {
 487                         return "$path/$conf";
 488                 }
 489         }
 490
 491         return "";
 492 }
 493
 494 sub expand_tabs {
 495         my ($str) = @_;
 496
 497         my $res = '';
 498         my $n = 0;
 499         for my $c (split(//, $str)) {
 500                 if ($c eq "\t") {
 501                         $res .= ' ';
 502                         $n++;
 503                         for (; ($n % 8) != 0; $n++) {
 504                                 $res .= ' ';
 505                         }
 506                         next;
 507                 }
 508                 $res .= $c;
 509                 $n++;
 510         }
 511
 512         return $res;
 513 }
 514 sub copy_spacing {
 515         (my $res = shift) =~ tr/\t/ /c;
 516         return $res;
 517 }
 518
 519 sub line_stats {
 520         my ($line) = @_;
 521
 522         # Drop the diff line leader and expand tabs
 523         $line =~ s/^.//;
 524         $line = expand_tabs($line);
 525
 526         # Pick the indent from the front of the line.
 527         my ($white) = ($line =~ /^(\s*)/);
 528
 529         return (length($line), length($white));
 530 }
 531
 532 my $sanitise_quote = '';
 533
 534 sub sanitise_line_reset {
 535         my ($in_comment) = @_;
 536
 537         if ($in_comment) {
 538                 $sanitise_quote = '*/';
 539         } else {
 540                 $sanitise_quote = '';
 541         }
 542 }
 543 sub sanitise_line {
 544         my ($line) = @_;
 545
 546         my $res = '';
 547         my $l = '';
 548
 549         my $qlen = 0;
 550         my $off = 0;
 551         my $c;
 552
 553         # Always copy over the diff marker.
 554         $res = substr($line, 0, 1);
 555
 556         for ($off = 1; $off < length($line); $off++) {
 557                 $c = substr($line, $off, 1);
 558
 559                 # Comments we are wacking completly including the begin
 560                 # and end, all to $;.
 561                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 562                         $sanitise_quote = '*/';
 563
 564                         substr($res, $off, 2, "$;$;");
 565                         $off++;
 566                         next;
 567                 }
 568                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 569                         $sanitise_quote = '';
 570                         substr($res, $off, 2, "$;$;");
 571                         $off++;
 572                         next;
 573                 }
 574                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 575                         $sanitise_quote = '//';
 576
 577                         substr($res, $off, 2, $sanitise_quote);
 578                         $off++;
 579                         next;
 580                 }
 581
 582                 # A \ in a string means ignore the next character.
 583                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 584                     $c eq "\\") {
 585                         substr($res, $off, 2, 'XX');
 586                         $off++;
 587                         next;
 588                 }
 589                 # Regular quotes.
 590                 if ($c eq "'" || $c eq '"') {
 591                         if ($sanitise_quote eq '') {
 592                                 $sanitise_quote = $c;
 593
 594                                 substr($res, $off, 1, $c);
 595                                 next;
 596                         } elsif ($sanitise_quote eq $c) {
 597                                 $sanitise_quote = '';
 598                         }
 599                 }
 600
 601                 #print "c<$c> SQ<$sanitise_quote>\n";
 602                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
 603                         substr($res, $off, 1, $;);
 604                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
 605                         substr($res, $off, 1, $;);
 606                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
 607                         substr($res, $off, 1, 'X');
 608                 } else {
 609                         substr($res, $off, 1, $c);
 610                 }
 611         }
 612
 613         if ($sanitise_quote eq '//') {
 614                 $sanitise_quote = '';
 615         }
 616
 617         # The pathname on a #include may be surrounded by '<' and '>'.
 618         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
 619                 my $clean = 'X' x length($1);
 620                 $res =~ s@\<.*\>@<$clean>@;
 621
 622         # The whole of a #error is a string.
 623         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
 624                 my $clean = 'X' x length($1);
 625                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
 626         }
 627
 628         return $res;
 629 }
 630
 631 sub ctx_statement_block {
 632         my ($linenr, $remain, $off) = @_;
 633         my $line = $linenr - 1;
 634         my $blk = '';
 635         my $soff = $off;
 636         my $coff = $off - 1;
 637         my $coff_set = 0;
 638
 639         my $loff = 0;
 640
 641         my $type = '';
 642         my $level = 0;
 643         my @stack = ();
 644         my $p;
 645         my $c;
 646         my $len = 0;
 647
 648         my $remainder;
 649         while (1) {
 650                 @stack = (['', 0]) if ($#stack == -1);
 651
 652                 #warn "CSB: blk<$blk> remain<$remain>\n";
 653                 # If we are about to drop off the end, pull in more
 654                 # context.
 655                 if ($off >= $len) {
 656                         for (; $remain > 0; $line++) {
 657                                 last if (!defined $lines[$line]);
 658                                 next if ($lines[$line] =~ /^-/);
 659                                 $remain--;
 660                                 $loff = $len;
 661                                 $blk .= $lines[$line] . "\n";
 662                                 $len = length($blk);
 663                                 $line++;
 664                                 last;
 665                         }
 666                         # Bail if there is no further context.
 667                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
 668                         if ($off >= $len) {
 669                                 last;
 670                         }
 671                         if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
 672                                 $level++;
 673                                 $type = '#';
 674                         }
 675                 }
 676                 $p = $c;
 677                 $c = substr($blk, $off, 1);
 678                 $remainder = substr($blk, $off);
 679
 680                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
 681
 682                 # Handle nested #if/#else.
 683                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
 684                         push(@stack, [ $type, $level ]);
 685                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
 686                         ($type, $level) = @{$stack[$#stack - 1]};
 687                 } elsif ($remainder =~ /^#\s*endif\b/) {
 688                         ($type, $level) = @{pop(@stack)};
 689                 }
 690
 691                 # Statement ends at the ';' or a close '}' at the
 692                 # outermost level.
 693                 if ($level == 0 && $c eq ';') {
 694                         last;
 695                 }
 696
 697                 # An else is really a conditional as long as its not else if
 698                 if ($level == 0 && $coff_set == 0 &&
 699                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
 700                                 $remainder =~ /^(else)(?:\s|{)/ &&
 701                                 $remainder !~ /^else\s+if\b/) {
 702                         $coff = $off + length($1) - 1;
 703                         $coff_set = 1;
 704                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
 705                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
 706                 }
 707
 708                 if (($type eq '' || $type eq '(') && $c eq '(') {
 709                         $level++;
 710                         $type = '(';
 711                 }
 712                 if ($type eq '(' && $c eq ')') {
 713                         $level--;
 714                         $type = ($level != 0)? '(' : '';
 715
 716                         if ($level == 0 && $coff < $soff) {
 717                                 $coff = $off;
 718                                 $coff_set = 1;
 719                                 #warn "CSB: mark coff<$coff>\n";
 720                         }
 721                 }
 722                 if (($type eq '' || $type eq '{') && $c eq '{') {
 723                         $level++;
 724                         $type = '{';
 725                 }
 726                 if ($type eq '{' && $c eq '}') {
 727                         $level--;
 728                         $type = ($level != 0)? '{' : '';
 729
 730                         if ($level == 0) {
 731                                 if (substr($blk, $off + 1, 1) eq ';') {
 732                                         $off++;
 733                                 }
 734                                 last;
 735                         }
 736                 }
 737                 # Preprocessor commands end at the newline unless escaped.
 738                 if ($type eq '#' && $c eq "\n" && $p ne "\\") {
 739                         $level--;
 740                         $type = '';
 741                         $off++;
 742                         last;
 743                 }
 744                 $off++;
 745         }
 746         # We are truly at the end, so shuffle to the next line.
 747         if ($off == $len) {
 748                 $loff = $len + 1;
 749                 $line++;
 750                 $remain--;
 751         }
 752
 753         my $statement = substr($blk, $soff, $off - $soff + 1);
 754         my $condition = substr($blk, $soff, $coff - $soff + 1);
 755
 756         #warn "STATEMENT<$statement>\n";
 757         #warn "CONDITION<$condition>\n";
 758
 759         #print "coff<$coff> soff<$off> loff<$loff>\n";
 760
 761         return ($statement, $condition,
 762                         $line, $remain + 1, $off - $loff + 1, $level);
 763 }
 764
 765 sub statement_lines {
 766         my ($stmt) = @_;
 767
 768         # Strip the diff line prefixes and rip blank lines at start and end.
 769         $stmt =~ s/(^|\n)./$1/g;
 770         $stmt =~ s/^\s*//;
 771         $stmt =~ s/\s*$//;
 772
 773         my @stmt_lines = ($stmt =~ /\n/g);
 774
 775         return $#stmt_lines + 2;
 776 }
 777
 778 sub statement_rawlines {
 779         my ($stmt) = @_;
 780
 781         my @stmt_lines = ($stmt =~ /\n/g);
 782
 783         return $#stmt_lines + 2;
 784 }
 785
 786 sub statement_block_size {
 787         my ($stmt) = @_;
 788
 789         $stmt =~ s/(^|\n)./$1/g;
 790         $stmt =~ s/^\s*{//;
 791         $stmt =~ s/}\s*$//;
 792         $stmt =~ s/^\s*//;
 793         $stmt =~ s/\s*$//;
 794
 795         my @stmt_lines = ($stmt =~ /\n/g);
 796         my @stmt_statements = ($stmt =~ /;/g);
 797
 798         my $stmt_lines = $#stmt_lines + 2;
 799         my $stmt_statements = $#stmt_statements + 1;
 800
 801         if ($stmt_lines > $stmt_statements) {
 802                 return $stmt_lines;
 803         } else {
 804                 return $stmt_statements;
 805         }
 806 }
 807
 808 sub ctx_statement_full {
 809         my ($linenr, $remain, $off) = @_;
 810         my ($statement, $condition, $level);
 811
 812         my (@chunks);
 813
 814         # Grab the first conditional/block pair.
 815         ($statement, $condition, $linenr, $remain, $off, $level) =
 816                                 ctx_statement_block($linenr, $remain, $off);
 817         #print "F: c<$condition> s<$statement> remain<$remain>\n";
 818         push(@chunks, [ $condition, $statement ]);
 819         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
 820                 return ($level, $linenr, @chunks);
 821         }
 822
 823         # Pull in the following conditional/block pairs and see if they
 824         # could continue the statement.
 825         for (;;) {
 826                 ($statement, $condition, $linenr, $remain, $off, $level) =
 827                                 ctx_statement_block($linenr, $remain, $off);
 828                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
 829                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
 830                 #print "C: push\n";
 831                 push(@chunks, [ $condition, $statement ]);
 832         }
 833
 834         return ($level, $linenr, @chunks);
 835 }
 836
 837 sub ctx_block_get {
 838         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
 839         my $line;
 840         my $start = $linenr - 1;
 841         my $blk = '';
 842         my @o;
 843         my @c;
 844         my @res = ();
 845
 846         my $level = 0;
 847         my @stack = ($level);
 848         for ($line = $start; $remain > 0; $line++) {
 849                 next if ($rawlines[$line] =~ /^-/);
 850                 $remain--;
 851
 852                 $blk .= $rawlines[$line];
 853
 854                 # Handle nested #if/#else.
 855                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
 856                         push(@stack, $level);
 857                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
 858                         $level = $stack[$#stack - 1];
 859                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
 860                         $level = pop(@stack);
 861                 }
 862
 863                 foreach my $c (split(//, $lines[$line])) {
 864                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
 865                         if ($off > 0) {
 866                                 $off--;
 867                                 next;
 868                         }
 869
 870                         if ($c eq $close && $level > 0) {
 871                                 $level--;
 872                                 last if ($level == 0);
 873                         } elsif ($c eq $open) {
 874                                 $level++;
 875                         }
 876                 }
 877
 878                 if (!$outer || $level <= 1) {
 879                         push(@res, $rawlines[$line]);
 880                 }
 881
 882                 last if ($level == 0);
 883         }
 884
 885         return ($level, @res);
 886 }
 887 sub ctx_block_outer {
 888         my ($linenr, $remain) = @_;
 889
 890         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
 891         return @r;
 892 }
 893 sub ctx_block {
 894         my ($linenr, $remain) = @_;
 895
 896         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 897         return @r;
 898 }
 899 sub ctx_statement {
 900         my ($linenr, $remain, $off) = @_;
 901
 902         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 903         return @r;
 904 }
 905 sub ctx_block_level {
 906         my ($linenr, $remain) = @_;
 907
 908         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 909 }
 910 sub ctx_statement_level {
 911         my ($linenr, $remain, $off) = @_;
 912
 913         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 914 }
 915
 916 sub ctx_locate_comment {
 917         my ($first_line, $end_line) = @_;
 918
 919         # Catch a comment on the end of the line itself.
 920         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
 921         return $current_comment if (defined $current_comment);
 922
 923         # Look through the context and try and figure out if there is a
 924         # comment.
 925         my $in_comment = 0;
 926         $current_comment = '';
 927         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
 928                 my $line = $rawlines[$linenr - 1];
 929                 #warn "           $line\n";
 930                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
 931                         $in_comment = 1;
 932                 }
 933                 if ($line =~ m@/\*@) {
 934                         $in_comment = 1;
 935                 }
 936                 if (!$in_comment && $current_comment ne '') {
 937                         $current_comment = '';
 938                 }
 939                 $current_comment .= $line . "\n" if ($in_comment);
 940                 if ($line =~ m@\*/@) {
 941                         $in_comment = 0;
 942                 }
 943         }
 944
 945         chomp($current_comment);
 946         return($current_comment);
 947 }
 948 sub ctx_has_comment {
 949         my ($first_line, $end_line) = @_;
 950         my $cmt = ctx_locate_comment($first_line, $end_line);
 951
 952         ##print "LINE: $rawlines[$end_line - 1 ]\n";
 953         ##print "CMMT: $cmt\n";
 954
 955         return ($cmt ne '');
 956 }
 957
 958 sub raw_line {
 959         my ($linenr, $cnt) = @_;
 960
 961         my $offset = $linenr - 1;
 962         $cnt++;
 963
 964         my $line;
 965         while ($cnt) {
 966                 $line = $rawlines[$offset++];
 967                 next if (defined($line) && $line =~ /^-/);
 968                 $cnt--;
 969         }
 970
 971         return $line;
 972 }
 973
 974 sub cat_vet {
 975         my ($vet) = @_;
 976         my ($res, $coded);
 977
 978         $res = '';
 979         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
 980                 $res .= $1;
 981                 if ($2 ne '') {
 982                         $coded = sprintf("^%c", unpack('C', $2) + 64);
 983                         $res .= $coded;
 984                 }
 985         }
 986         $res =~ s/$/\$/;
 987
 988         return $res;
 989 }
 990
 991 my $av_preprocessor = 0;
 992 my $av_pending;
 993 my @av_paren_type;
 994 my $av_pend_colon;
 995
 996 sub annotate_reset {
 997         $av_preprocessor = 0;
 998         $av_pending = '_';
 999         @av_paren_type = ('E');
1000         $av_pend_colon = 'O';
1001 }
1002
1003 sub annotate_values {
1004         my ($stream, $type) = @_;
1005
1006         my $res;
1007         my $var = '_' x length($stream);
1008         my $cur = $stream;
1009
1010         print "$stream\n" if ($dbg_values > 1);
1011
1012         while (length($cur)) {
1013                 @av_paren_type = ('E') if ($#av_paren_type < 0);
1014                 print " <" . join('', @av_paren_type) .
1015                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
1016                 if ($cur =~ /^(\s+)/o) {
1017                         print "WS($1)\n" if ($dbg_values > 1);
1018                         if ($1 =~ /\n/ && $av_preprocessor) {
1019                                 $type = pop(@av_paren_type);
1020                                 $av_preprocessor = 0;
1021                         }
1022
1023                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1024                         print "CAST($1)\n" if ($dbg_values > 1);
1025                         push(@av_paren_type, $type);
1026                         $type = 'c';
1027
1028                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1029                         print "DECLARE($1)\n" if ($dbg_values > 1);
1030                         $type = 'T';
1031
1032                 } elsif ($cur =~ /^($Modifier)\s*/) {
1033                         print "MODIFIER($1)\n" if ($dbg_values > 1);
1034                         $type = 'T';
1035
1036                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1037                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1038                         $av_preprocessor = 1;
1039                         push(@av_paren_type, $type);
1040                         if ($2 ne '') {
1041                                 $av_pending = 'N';
1042                         }
1043                         $type = 'E';
1044
1045                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1046                         print "UNDEF($1)\n" if ($dbg_values > 1);
1047                         $av_preprocessor = 1;
1048                         push(@av_paren_type, $type);
1049
1050                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1051                         print "PRE_START($1)\n" if ($dbg_values > 1);
1052                         $av_preprocessor = 1;
1053
1054                         push(@av_paren_type, $type);
1055                         push(@av_paren_type, $type);
1056                         $type = 'E';
1057
1058                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1059                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1060                         $av_preprocessor = 1;
1061
1062                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1063
1064                         $type = 'E';
1065
1066                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1067                         print "PRE_END($1)\n" if ($dbg_values > 1);
1068
1069                         $av_preprocessor = 1;
1070
1071                         # Assume all arms of the conditional end as this
1072                         # one does, and continue as if the #endif was not here.
1073                         pop(@av_paren_type);
1074                         push(@av_paren_type, $type);
1075                         $type = 'E';
1076
1077                 } elsif ($cur =~ /^(\\\n)/o) {
1078                         print "PRECONT($1)\n" if ($dbg_values > 1);
1079
1080                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1081                         print "ATTR($1)\n" if ($dbg_values > 1);
1082                         $av_pending = $type;
1083                         $type = 'N';
1084
1085                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1086                         print "SIZEOF($1)\n" if ($dbg_values > 1);
1087                         if (defined $2) {
1088                                 $av_pending = 'V';
1089                         }
1090                         $type = 'N';
1091
1092                 } elsif ($cur =~ /^(if|while|for)\b/o) {
1093                         print "COND($1)\n" if ($dbg_values > 1);
1094                         $av_pending = 'E';
1095                         $type = 'N';
1096
1097                 } elsif ($cur =~/^(case)/o) {
1098                         print "CASE($1)\n" if ($dbg_values > 1);
1099                         $av_pend_colon = 'C';
1100                         $type = 'N';
1101
1102                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1103                         print "KEYWORD($1)\n" if ($dbg_values > 1);
1104                         $type = 'N';
1105
1106                 } elsif ($cur =~ /^(\()/o) {
1107                         print "PAREN('$1')\n" if ($dbg_values > 1);
1108                         push(@av_paren_type, $av_pending);
1109                         $av_pending = '_';
1110                         $type = 'N';
1111
1112                 } elsif ($cur =~ /^(\))/o) {
1113                         my $new_type = pop(@av_paren_type);
1114                         if ($new_type ne '_') {
1115                                 $type = $new_type;
1116                                 print "PAREN('$1') -> $type\n"
1117                                                         if ($dbg_values > 1);
1118                         } else {
1119                                 print "PAREN('$1')\n" if ($dbg_values > 1);
1120                         }
1121
1122                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
1123                         print "FUNC($1)\n" if ($dbg_values > 1);
1124                         $type = 'V';
1125                         $av_pending = 'V';
1126
1127                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1128                         if (defined $2 && $type eq 'C' || $type eq 'T') {
1129                                 $av_pend_colon = 'B';
1130                         } elsif ($type eq 'E') {
1131                                 $av_pend_colon = 'L';
1132                         }
1133                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1134                         $type = 'V';
1135
1136                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
1137                         print "IDENT($1)\n" if ($dbg_values > 1);
1138                         $type = 'V';
1139
1140                 } elsif ($cur =~ /^($Assignment)/o) {
1141                         print "ASSIGN($1)\n" if ($dbg_values > 1);
1142                         $type = 'N';
1143
1144                 } elsif ($cur =~/^(;|{|})/) {
1145                         print "END($1)\n" if ($dbg_values > 1);
1146                         $type = 'E';
1147                         $av_pend_colon = 'O';
1148
1149                 } elsif ($cur =~/^(,)/) {
1150                         print "COMMA($1)\n" if ($dbg_values > 1);
1151                         $type = 'C';
1152
1153                 } elsif ($cur =~ /^(\?)/o) {
1154                         print "QUESTION($1)\n" if ($dbg_values > 1);
1155                         $type = 'N';
1156
1157                 } elsif ($cur =~ /^(:)/o) {
1158                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1159
1160                         substr($var, length($res), 1, $av_pend_colon);
1161                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1162                                 $type = 'E';
1163                         } else {
1164                                 $type = 'N';
1165                         }
1166                         $av_pend_colon = 'O';
1167
1168                 } elsif ($cur =~ /^(\[)/o) {
1169                         print "CLOSE($1)\n" if ($dbg_values > 1);
1170                         $type = 'N';
1171
1172                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1173                         my $variant;
1174
1175                         print "OPV($1)\n" if ($dbg_values > 1);
1176                         if ($type eq 'V') {
1177                                 $variant = 'B';
1178                         } else {
1179                                 $variant = 'U';
1180                         }
1181
1182                         substr($var, length($res), 1, $variant);
1183                         $type = 'N';
1184
1185                 } elsif ($cur =~ /^($Operators)/o) {
1186                         print "OP($1)\n" if ($dbg_values > 1);
1187                         if ($1 ne '++' && $1 ne '--') {
1188                                 $type = 'N';
1189                         }
1190
1191                 } elsif ($cur =~ /(^.)/o) {
1192                         print "C($1)\n" if ($dbg_values > 1);
1193                 }
1194                 if (defined $1) {
1195                         $cur = substr($cur, length($1));
1196                         $res .= $type x length($1);
1197                 }
1198         }
1199
1200         return ($res, $var);
1201 }
1202
1203 sub possible {
1204         my ($possible, $line) = @_;
1205         my $notPermitted = qr{(?:
1206                 ^(?:
1207                         $Modifier|
1208                         $Storage|
1209                         $Type|
1210                         DEFINE_\S+
1211                 )$|
1212                 ^(?:
1213                         goto|
1214                         return|
1215                         case|
1216                         else|
1217                         asm|__asm__|
1218                         do|
1219                         \#|
1220                         \#\#|
1221                 )(?:\s|$)|
1222                 ^(?:typedef|struct|enum)\b
1223             )}x;
1224         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1225         if ($possible !~ $notPermitted) {
1226                 # Check for modifiers.
1227                 $possible =~ s/\s*$Storage\s*//g;
1228                 $possible =~ s/\s*$Sparse\s*//g;
1229                 if ($possible =~ /^\s*$/) {
1230
1231                 } elsif ($possible =~ /\s/) {
1232                         $possible =~ s/\s*$Type\s*//g;
1233                         for my $modifier (split(' ', $possible)) {
1234                                 if ($modifier !~ $notPermitted) {
1235                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1236                                         push(@modifierList, $modifier);
1237                                 }
1238                         }
1239
1240                 } else {
1241                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1242                         push(@typeList, $possible);
1243                 }
1244                 build_types();
1245         } else {
1246                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1247         }
1248 }
1249
1250 my $prefix = '';
1251
1252 sub show_type {
1253        return !defined $ignore_type{$_[0]};
1254 }
1255
1256 sub report {
1257         if (!show_type($_[1]) ||
1258             (defined $tst_only && $_[2] !~ /\Q$tst_only\E/)) {
1259                 return 0;
1260         }
1261         my $line;
1262         if ($show_types) {
1263                 $line = "$prefix$_[0]:$_[1]: $_[2]\n";
1264         } else {
1265                 $line = "$prefix$_[0]: $_[2]\n";
1266         }
1267         $line = (split('\n', $line))[0] . "\n" if ($terse);
1268
1269         push(our @report, $line);
1270
1271         return 1;
1272 }
1273 sub report_dump {
1274         our @report;
1275 }
1276
1277 sub ERROR {
1278         if (report("ERROR", $_[0], $_[1])) {
1279                 our $clean = 0;
1280                 our $cnt_error++;
1281         }
1282 }
1283 sub WARN {
1284         if (report("WARNING", $_[0], $_[1])) {
1285                 our $clean = 0;
1286                 our $cnt_warn++;
1287         }
1288 }
1289 sub CHK {
1290         if ($check && report("CHECK", $_[0], $_[1])) {
1291                 our $clean = 0;
1292                 our $cnt_chk++;
1293         }
1294 }
1295
1296 sub check_absolute_file {
1297         my ($absolute, $herecurr) = @_;
1298         my $file = $absolute;
1299
1300         ##print "absolute<$absolute>\n";
1301
1302         # See if any suffix of this path is a path within the tree.
1303         while ($file =~ s@^[^/]*/@@) {
1304                 if (-f "$root/$file") {
1305                         ##print "file<$file>\n";
1306                         last;
1307                 }
1308         }
1309         if (! -f _)  {
1310                 return 0;
1311         }
1312
1313         # It is, so see if the prefix is acceptable.
1314         my $prefix = $absolute;
1315         substr($prefix, -length($file)) = '';
1316
1317         ##print "prefix<$prefix>\n";
1318         if ($prefix ne ".../") {
1319                 WARN("USE_RELATIVE_PATH",
1320                      "use relative pathname instead of absolute in changelog text\n" . $herecurr);
1321         }
1322 }
1323
1324 sub pos_last_openparen {
1325         my ($line) = @_;
1326
1327         my $pos = 0;
1328
1329         my $opens = $line =~ tr/\(/\(/;
1330         my $closes = $line =~ tr/\)/\)/;
1331
1332         my $last_openparen = 0;
1333
1334         if (($opens == 0) || ($closes >= $opens)) {
1335                 return -1;
1336         }
1337
1338         my $len = length($line);
1339
1340         for ($pos = 0; $pos < $len; $pos++) {
1341                 my $string = substr($line, $pos);
1342                 if ($string =~ /^($FuncArg|$balanced_parens)/) {
1343                         $pos += length($1) - 1;
1344                 } elsif (substr($line, $pos, 1) eq '(') {
1345                         $last_openparen = $pos;
1346                 } elsif (index($string, '(') == -1) {
1347                         last;
1348                 }
1349         }
1350
1351         return $last_openparen + 1;
1352 }
1353
1354 sub process {
1355         my $filename = shift;
1356
1357         my $linenr=0;
1358         my $prevline="";
1359         my $prevrawline="";
1360         my $stashline="";
1361         my $stashrawline="";
1362
1363         my $length;
1364         my $indent;
1365         my $previndent=0;
1366         my $stashindent=0;
1367
1368         our $clean = 1;
1369         my $signoff = 0;
1370         my $is_patch = 0;
1371
1372         my $in_header_lines = 1;
1373         my $in_commit_log = 0;          #Scanning lines before patch
1374
1375         my $non_utf8_charset = 0;
1376
1377         our @report = ();
1378         our $cnt_lines = 0;
1379         our $cnt_error = 0;
1380         our $cnt_warn = 0;
1381         our $cnt_chk = 0;
1382
1383         # Trace the real file/line as we go.
1384         my $realfile = '';
1385         my $realline = 0;
1386         my $realcnt = 0;
1387         my $here = '';
1388         my $in_comment = 0;
1389         my $comment_edge = 0;
1390         my $first_line = 0;
1391         my $p1_prefix = '';
1392
1393         my $prev_values = 'E';
1394
1395         # suppression flags
1396         my %suppress_ifbraces;
1397         my %suppress_whiletrailers;
1398         my %suppress_export;
1399         my $suppress_statement = 0;
1400
1401         my %camelcase = ();
1402
1403         # Pre-scan the patch sanitizing the lines.
1404         # Pre-scan the patch looking for any __setup documentation.
1405         #
1406         my @setup_docs = ();
1407         my $setup_docs = 0;
1408
1409         sanitise_line_reset();
1410         my $line;
1411         foreach my $rawline (@rawlines) {
1412                 $linenr++;
1413                 $line = $rawline;
1414
1415                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
1416                         $setup_docs = 0;
1417                         if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1418                                 $setup_docs = 1;
1419                         }
1420                         #next;
1421                 }
1422                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1423                         $realline=$1-1;
1424                         if (defined $2) {
1425                                 $realcnt=$3+1;
1426                         } else {
1427                                 $realcnt=1+1;
1428                         }
1429                         $in_comment = 0;
1430
1431                         # Guestimate if this is a continuing comment.  Run
1432                         # the context looking for a comment "edge".  If this
1433                         # edge is a close comment then we must be in a comment
1434                         # at context start.
1435                         my $edge;
1436                         my $cnt = $realcnt;
1437                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1438                                 next if (defined $rawlines[$ln - 1] &&
1439                                          $rawlines[$ln - 1] =~ /^-/);
1440                                 $cnt--;
1441                                 #print "RAW<$rawlines[$ln - 1]>\n";
1442                                 last if (!defined $rawlines[$ln - 1]);
1443                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1444                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1445                                         ($edge) = $1;
1446                                         last;
1447                                 }
1448                         }
1449                         if (defined $edge && $edge eq '*/') {
1450                                 $in_comment = 1;
1451                         }
1452
1453                         # Guestimate if this is a continuing comment.  If this
1454                         # is the start of a diff block and this line starts
1455                         # ' *' then it is very likely a comment.
1456                         if (!defined $edge &&
1457                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1458                         {
1459                                 $in_comment = 1;
1460                         }
1461
1462                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1463                         sanitise_line_reset($in_comment);
1464
1465                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1466                         # Standardise the strings and chars within the input to
1467                         # simplify matching -- only bother with positive lines.
1468                         $line = sanitise_line($rawline);
1469                 }
1470                 push(@lines, $line);
1471
1472                 if ($realcnt > 1) {
1473                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1474                 } else {
1475                         $realcnt = 0;
1476                 }
1477
1478                 #print "==>$rawline\n";
1479                 #print "-->$line\n";
1480
1481                 if ($setup_docs && $line =~ /^\+/) {
1482                         push(@setup_docs, $line);
1483                 }
1484         }
1485
1486         $prefix = '';
1487
1488         $realcnt = 0;
1489         $linenr = 0;
1490         foreach my $line (@lines) {
1491                 $linenr++;
1492
1493                 my $rawline = $rawlines[$linenr - 1];
1494
1495 #extract the line range in the file after the patch is applied
1496                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1497                         $is_patch = 1;
1498                         $first_line = $linenr + 1;
1499                         $realline=$1-1;
1500                         if (defined $2) {
1501                                 $realcnt=$3+1;
1502                         } else {
1503                                 $realcnt=1+1;
1504                         }
1505                         annotate_reset();
1506                         $prev_values = 'E';
1507
1508                         %suppress_ifbraces = ();
1509                         %suppress_whiletrailers = ();
1510                         %suppress_export = ();
1511                         $suppress_statement = 0;
1512                         next;
1513
1514 # track the line number as we move through the hunk, note that
1515 # new versions of GNU diff omit the leading space on completely
1516 # blank context lines so we need to count that too.
1517                 } elsif ($line =~ /^( |\+|$)/) {
1518                         $realline++;
1519                         $realcnt-- if ($realcnt != 0);
1520
1521                         # Measure the line length and indent.
1522                         ($length, $indent) = line_stats($rawline);
1523
1524                         # Track the previous line.
1525                         ($prevline, $stashline) = ($stashline, $line);
1526                         ($previndent, $stashindent) = ($stashindent, $indent);
1527                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1528
1529                         #warn "line<$line>\n";
1530
1531                 } elsif ($realcnt == 1) {
1532                         $realcnt--;
1533                 }
1534
1535                 my $hunk_line = ($realcnt != 0);
1536
1537 #make up the handle for any error we report on this line
1538                 $prefix = "$filename:$realline: " if ($emacs && $file);
1539                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
1540
1541                 $here = "#$linenr: " if (!$file);
1542                 $here = "#$realline: " if ($file);
1543
1544                 # extract the filename as it passes
1545                 if ($line =~ /^diff --git.*?(\S+)$/) {
1546                         $realfile = $1;
1547                         $realfile =~ s@^([^/]*)/@@;
1548                         $in_commit_log = 0;
1549                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1550                         $realfile = $1;
1551                         $realfile =~ s@^([^/]*)/@@;
1552                         $in_commit_log = 0;
1553
1554                         $p1_prefix = $1;
1555                         if (!$file && $tree && $p1_prefix ne '' &&
1556                             -e "$root/$p1_prefix") {
1557                                 WARN("PATCH_PREFIX",
1558                                      "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1559                         }
1560
1561                         if ($realfile =~ m@^include/asm/@) {
1562                                 ERROR("MODIFIED_INCLUDE_ASM",
1563                                       "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
1564                         }
1565                         next;
1566                 }
1567
1568                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1569
1570                 my $hereline = "$here\n$rawline\n";
1571                 my $herecurr = "$here\n$rawline\n";
1572                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
1573
1574                 $cnt_lines++ if ($realcnt != 0);
1575
1576 # Check for incorrect file permissions
1577                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1578                         my $permhere = $here . "FILE: $realfile\n";
1579                         if ($realfile =~ /(Makefile|Kconfig|\.c|\.h|\.S|\.tmpl)$/) {
1580                                 ERROR("EXECUTE_PERMISSIONS",
1581                                       "do not set execute permissions for source files\n" . $permhere);
1582                         }
1583                 }
1584
1585 # Check the patch for a signoff:
1586                 if ($line =~ /^\s*signed-off-by:/i) {
1587                         $signoff++;
1588                         $in_commit_log = 0;
1589                 }
1590
1591 # Check signature styles
1592                 if (!$in_header_lines &&
1593                     $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
1594                         my $space_before = $1;
1595                         my $sign_off = $2;
1596                         my $space_after = $3;
1597                         my $email = $4;
1598                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
1599
1600                         if ($sign_off !~ /$signature_tags/) {
1601                                 WARN("BAD_SIGN_OFF",
1602                                      "Non-standard signature: $sign_off\n" . $herecurr);
1603                         }
1604                         if (defined $space_before && $space_before ne "") {
1605                                 WARN("BAD_SIGN_OFF",
1606                                      "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr);
1607                         }
1608                         if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
1609                                 WARN("BAD_SIGN_OFF",
1610                                      "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr);
1611                         }
1612                         if (!defined $space_after || $space_after ne " ") {
1613                                 WARN("BAD_SIGN_OFF",
1614                                      "Use a single space after $ucfirst_sign_off\n" . $herecurr);
1615                         }
1616
1617                         my ($email_name, $email_address, $comment) = parse_email($email);
1618                         my $suggested_email = format_email(($email_name, $email_address));
1619                         if ($suggested_email eq "") {
1620                                 ERROR("BAD_SIGN_OFF",
1621                                       "Unrecognized email address: '$email'\n" . $herecurr);
1622                         } else {
1623                                 my $dequoted = $suggested_email;
1624                                 $dequoted =~ s/^"//;
1625                                 $dequoted =~ s/" </ </;
1626                                 # Don't force email to have quotes
1627                                 # Allow just an angle bracketed address
1628                                 if ("$dequoted$comment" ne $email &&
1629                                     "<$email_address>$comment" ne $email &&
1630                                     "$suggested_email$comment" ne $email) {
1631                                         WARN("BAD_SIGN_OFF",
1632                                              "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
1633                                 }
1634                         }
1635                 }
1636
1637 # Check for wrappage within a valid hunk of the file
1638                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1639                         ERROR("CORRUPTED_PATCH",
1640                               "patch seems to be corrupt (line wrapped?)\n" .
1641                                 $herecurr) if (!$emitted_corrupt++);
1642                 }
1643
1644 # Check for absolute kernel paths.
1645                 if ($tree) {
1646                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
1647                                 my $file = $1;
1648
1649                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
1650                                     check_absolute_file($1, $herecurr)) {
1651                                         #
1652                                 } else {
1653                                         check_absolute_file($file, $herecurr);
1654                                 }
1655                         }
1656                 }
1657
1658 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1659                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1660                     $rawline !~ m/^$UTF8*$/) {
1661                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1662
1663                         my $blank = copy_spacing($rawline);
1664                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1665                         my $hereptr = "$hereline$ptr\n";
1666
1667                         CHK("INVALID_UTF8",
1668                             "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1669                 }
1670
1671 # Check if it's the start of a commit log
1672 # (not a header line and we haven't seen the patch filename)
1673                 if ($in_header_lines && $realfile =~ /^$/ &&
1674                     $rawline !~ /^(commit\b|from\b|[\w-]+:).+$/i) {
1675                         $in_header_lines = 0;
1676                         $in_commit_log = 1;
1677                 }
1678
1679 # Check if there is UTF-8 in a commit log when a mail header has explicitly
1680 # declined it, i.e defined some charset where it is missing.
1681                 if ($in_header_lines &&
1682                     $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
1683                     $1 !~ /utf-8/i) {
1684                         $non_utf8_charset = 1;
1685                 }
1686
1687                 if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
1688                     $rawline =~ /$NON_ASCII_UTF8/) {
1689                         WARN("UTF8_BEFORE_PATCH",
1690                             "8-bit UTF-8 used in possible commit log\n" . $herecurr);
1691                 }
1692
1693 # ignore non-hunk lines and lines being removed
1694                 next if (!$hunk_line || $line =~ /^-/);
1695
1696 #trailing whitespace
1697                 if ($line =~ /^\+.*\015/) {
1698                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1699                         ERROR("DOS_LINE_ENDINGS",
1700                               "DOS line endings\n" . $herevet);
1701
1702                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1703                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1704                         ERROR("TRAILING_WHITESPACE",
1705                               "trailing whitespace\n" . $herevet);
1706                         $rpt_cleaners = 1;
1707                 }
1708
1709 # check for Kconfig help text having a real description
1710 # Only applies when adding the entry originally, after that we do not have
1711 # sufficient context to determine whether it is indeed long enough.
1712                 if ($realfile =~ /Kconfig/ &&
1713                     $line =~ /.\s*config\s+/) {
1714                         my $length = 0;
1715                         my $cnt = $realcnt;
1716                         my $ln = $linenr + 1;
1717                         my $f;
1718                         my $is_start = 0;
1719                         my $is_end = 0;
1720                         for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
1721                                 $f = $lines[$ln - 1];
1722                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
1723                                 $is_end = $lines[$ln - 1] =~ /^\+/;
1724
1725                                 next if ($f =~ /^-/);
1726
1727                                 if ($lines[$ln - 1] =~ /.\s*(?:bool|tristate)\s*\"/) {
1728                                         $is_start = 1;
1729                                 } elsif ($lines[$ln - 1] =~ /.\s*(?:---)?help(?:---)?$/) {
1730                                         $length = -1;
1731                                 }
1732
1733                                 $f =~ s/^.//;
1734                                 $f =~ s/#.*//;
1735                                 $f =~ s/^\s+//;
1736                                 next if ($f =~ /^$/);
1737                                 if ($f =~ /^\s*config\s/) {
1738                                         $is_end = 1;
1739                                         last;
1740                                 }
1741                                 $length++;
1742                         }
1743                         WARN("CONFIG_DESCRIPTION",
1744                              "please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($is_start && $is_end && $length < 4);
1745                         #print "is_start<$is_start> is_end<$is_end> length<$length>\n";
1746                 }
1747
1748 # discourage the addition of CONFIG_EXPERIMENTAL in Kconfig.
1749                 if ($realfile =~ /Kconfig/ &&
1750                     $line =~ /.\s*depends on\s+.*\bEXPERIMENTAL\b/) {
1751                         WARN("CONFIG_EXPERIMENTAL",
1752                              "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
1753                 }
1754
1755                 if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
1756                     ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
1757                         my $flag = $1;
1758                         my $replacement = {
1759                                 'EXTRA_AFLAGS' =>   'asflags-y',
1760                                 'EXTRA_CFLAGS' =>   'ccflags-y',
1761                                 'EXTRA_CPPFLAGS' => 'cppflags-y',
1762                                 'EXTRA_LDFLAGS' =>  'ldflags-y',
1763                         };
1764
1765                         WARN("DEPRECATED_VARIABLE",
1766                              "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
1767                 }
1768
1769 # check we are in a valid source file if not then ignore this hunk
1770                 next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
1771
1772 #line length limit
1773                 if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
1774                     $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
1775                     !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ ||
1776                     $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1777                     $length > $max_line_length)
1778                 {
1779                         WARN("LONG_LINE",
1780                              "line over $max_line_length characters\n" . $herecurr);
1781                 }
1782
1783 # Check for user-visible strings broken across lines, which breaks the ability
1784 # to grep for the string.  Limited to strings used as parameters (those
1785 # following an open parenthesis), which almost completely eliminates false
1786 # positives, as well as warning only once per parameter rather than once per
1787 # line of the string.  Make an exception when the previous string ends in a
1788 # newline (multiple lines in one string constant) or \n\t (common in inline
1789 # assembly to indent the instruction on the following line).
1790                 if ($line =~ /^\+\s*"/ &&
1791                     $prevline =~ /"\s*$/ &&
1792                     $prevline =~ /\(/ &&
1793                     $prevrawline !~ /\\n(?:\\t)*"\s*$/) {
1794                         WARN("SPLIT_STRING",
1795                              "quoted string split across lines\n" . $hereprev);
1796                 }
1797
1798 # check for spaces before a quoted newline
1799                 if ($rawline =~ /^.*\".*\s\\n/) {
1800                         WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
1801                              "unnecessary whitespace before a quoted newline\n" . $herecurr);
1802                 }
1803
1804 # check for adding lines without a newline.
1805                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1806                         WARN("MISSING_EOF_NEWLINE",
1807                              "adding a line without newline at end of file\n" . $herecurr);
1808                 }
1809
1810 # Blackfin: use hi/lo macros
1811                 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
1812                         if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
1813                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1814                                 ERROR("LO_MACRO",
1815                                       "use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
1816                         }
1817                         if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
1818                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1819                                 ERROR("HI_MACRO",
1820                                       "use the HI() macro, not (... >> 16)\n" . $herevet);
1821                         }
1822                 }
1823
1824 # check we are in a valid source file C or perl if not then ignore this hunk
1825                 next if ($realfile !~ /\.(h|c|pl)$/);
1826
1827 # at the beginning of a line any tabs must come first and anything
1828 # more than 8 must use tabs.
1829                 if ($rawline =~ /^\+\s* \t\s*\S/ ||
1830                     $rawline =~ /^\+\s*        \s*/) {
1831                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1832                         ERROR("CODE_INDENT",
1833                               "code indent should use tabs where possible\n" . $herevet);
1834                         $rpt_cleaners = 1;
1835                 }
1836
1837 # check for space before tabs.
1838                 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
1839                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1840                         WARN("SPACE_BEFORE_TAB",
1841                              "please, no space before tabs\n" . $herevet);
1842                 }
1843
1844 # check for && or || at the start of a line
1845                 if ($rawline =~ /^\+\s*(&&|\|\|)/) {
1846                         CHK("LOGICAL_CONTINUATIONS",
1847                             "Logical continuations should be on the previous line\n" . $hereprev);
1848                 }
1849
1850 # check multi-line statement indentation matches previous line
1851                 if ($^V && $^V ge 5.10.0 &&
1852                     $prevline =~ /^\+(\t*)(if \(|$Ident\().*(\&\&|\|\||,)\s*$/) {
1853                         $prevline =~ /^\+(\t*)(.*)$/;
1854                         my $oldindent = $1;
1855                         my $rest = $2;
1856
1857                         my $pos = pos_last_openparen($rest);
1858                         if ($pos >= 0) {
1859                                 $line =~ /^(\+| )([ \t]*)/;
1860                                 my $newindent = $2;
1861
1862                                 my $goodtabindent = $oldindent .
1863                                         "\t" x ($pos / 8) .
1864                                         " "  x ($pos % 8);
1865                                 my $goodspaceindent = $oldindent . " "  x $pos;
1866
1867                                 if ($newindent ne $goodtabindent &&
1868                                     $newindent ne $goodspaceindent) {
1869                                         CHK("PARENTHESIS_ALIGNMENT",
1870                                             "Alignment should match open parenthesis\n" . $hereprev);
1871                                 }
1872                         }
1873                 }
1874
1875                 if ($line =~ /^\+.*\*[ \t]*\)[ \t]+/) {
1876                         CHK("SPACING",
1877                             "No space is necessary after a cast\n" . $hereprev);
1878                 }
1879
1880                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
1881                     $rawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&
1882                     $prevrawline =~ /^\+[ \t]*$/) {
1883                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
1884                              "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
1885                 }
1886
1887                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
1888                     $rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&       #trailing */
1889                     $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&      #inline /*...*/
1890                     $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&       #trailing **/
1891                     $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {    #non blank */
1892                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
1893                              "networking block comments put the trailing */ on a separate line\n" . $herecurr);
1894                 }
1895
1896 # check for spaces at the beginning of a line.
1897 # Exceptions:
1898 #  1) within comments
1899 #  2) indented preprocessor commands
1900 #  3) hanging labels
1901                 if ($rawline =~ /^\+ / && $line !~ /\+ *(?:$;|#|$Ident:)/)  {
1902                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1903                         WARN("LEADING_SPACE",
1904                              "please, no spaces at the start of a line\n" . $herevet);
1905                 }
1906
1907 # check we are in a valid C source file if not then ignore this hunk
1908                 next if ($realfile !~ /\.(h|c)$/);
1909
1910 # discourage the addition of CONFIG_EXPERIMENTAL in #if(def).
1911                 if ($line =~ /^\+\s*\#\s*if.*\bCONFIG_EXPERIMENTAL\b/) {
1912                         WARN("CONFIG_EXPERIMENTAL",
1913                              "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
1914                 }
1915
1916 # check for RCS/CVS revision markers
1917                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
1918                         WARN("CVS_KEYWORD",
1919                              "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1920                 }
1921
1922 # Blackfin: don't use __builtin_bfin_[cs]sync
1923                 if ($line =~ /__builtin_bfin_csync/) {
1924                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1925                         ERROR("CSYNC",
1926                               "use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
1927                 }
1928                 if ($line =~ /__builtin_bfin_ssync/) {
1929                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1930                         ERROR("SSYNC",
1931                               "use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
1932                 }
1933
1934 # check for old HOTPLUG __dev<foo> section markings
1935                 if ($line =~ /\b(__dev(init|exit)(data|const|))\b/) {
1936                         WARN("HOTPLUG_SECTION",
1937                              "Using $1 is unnecessary\n" . $herecurr);
1938                 }
1939
1940 # Check for potential 'bare' types
1941                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1942                     $realline_next);
1943 #print "LINE<$line>\n";
1944                 if ($linenr >= $suppress_statement &&
1945                     $realcnt && $line =~ /.\s*\S/) {
1946                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1947                                 ctx_statement_block($linenr, $realcnt, 0);
1948                         $stat =~ s/\n./\n /g;
1949                         $cond =~ s/\n./\n /g;
1950
1951 #print "linenr<$linenr> <$stat>\n";
1952                         # If this statement has no statement boundaries within
1953                         # it there is no point in retrying a statement scan
1954                         # until we hit end of it.
1955                         my $frag = $stat; $frag =~ s/;+\s*$//;
1956                         if ($frag !~ /(?:{|;)/) {
1957 #print "skip<$line_nr_next>\n";
1958                                 $suppress_statement = $line_nr_next;
1959                         }
1960
1961                         # Find the real next line.
1962                         $realline_next = $line_nr_next;
1963                         if (defined $realline_next &&
1964                             (!defined $lines[$realline_next - 1] ||
1965                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1966                                 $realline_next++;
1967                         }
1968
1969                         my $s = $stat;
1970                         $s =~ s/{.*$//s;
1971
1972                         # Ignore goto labels.
1973                         if ($s =~ /$Ident:\*$/s) {
1974
1975                         # Ignore functions being called
1976                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1977
1978                         } elsif ($s =~ /^.\s*else\b/s) {
1979
1980                         # declarations always start with types
1981                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1982                                 my $type = $1;
1983                                 $type =~ s/\s+/ /g;
1984                                 possible($type, "A:" . $s);
1985
1986                         # definitions in global scope can only start with types
1987                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1988                                 possible($1, "B:" . $s);
1989                         }
1990
1991                         # any (foo ... *) is a pointer cast, and foo is a type
1992                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1993                                 possible($1, "C:" . $s);
1994                         }
1995
1996                         # Check for any sort of function declaration.
1997                         # int foo(something bar, other baz);
1998                         # void (*store_gdt)(x86_descr_ptr *);
1999                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
2000                                 my ($name_len) = length($1);
2001
2002                                 my $ctx = $s;
2003                                 substr($ctx, 0, $name_len + 1, '');
2004                                 $ctx =~ s/\)[^\)]*$//;
2005
2006                                 for my $arg (split(/\s*,\s*/, $ctx)) {
2007                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
2008
2009                                                 possible($1, "D:" . $s);
2010                                         }
2011                                 }
2012                         }
2013
2014                 }
2015
2016 #
2017 # Checks which may be anchored in the context.
2018 #
2019
2020 # Check for switch () and associated case and default
2021 # statements should be at the same indent.
2022                 if ($line=~/\bswitch\s*\(.*\)/) {
2023                         my $err = '';
2024                         my $sep = '';
2025                         my @ctx = ctx_block_outer($linenr, $realcnt);
2026                         shift(@ctx);
2027                         for my $ctx (@ctx) {
2028                                 my ($clen, $cindent) = line_stats($ctx);
2029                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
2030                                                         $indent != $cindent) {
2031                                         $err .= "$sep$ctx\n";
2032                                         $sep = '';
2033                                 } else {
2034                                         $sep = "[...]\n";
2035                                 }
2036                         }
2037                         if ($err ne '') {
2038                                 ERROR("SWITCH_CASE_INDENT_LEVEL",
2039                                       "switch and case should be at the same indent\n$hereline$err");
2040                         }
2041                 }
2042
2043 # if/while/etc brace do not go on next line, unless defining a do while loop,
2044 # or if that brace on the next line is for something else
2045                 if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
2046                         my $pre_ctx = "$1$2";
2047
2048                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
2049
2050                         if ($line =~ /^\+\t{6,}/) {
2051                                 WARN("DEEP_INDENTATION",
2052                                      "Too many leading tabs - consider code refactoring\n" . $herecurr);
2053                         }
2054
2055                         my $ctx_cnt = $realcnt - $#ctx - 1;
2056                         my $ctx = join("\n", @ctx);
2057
2058                         my $ctx_ln = $linenr;
2059                         my $ctx_skip = $realcnt;
2060
2061                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
2062                                         defined $lines[$ctx_ln - 1] &&
2063                                         $lines[$ctx_ln - 1] =~ /^-/)) {
2064                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
2065                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
2066                                 $ctx_ln++;
2067                         }
2068
2069                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
2070                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
2071
2072                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln -1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
2073                                 ERROR("OPEN_BRACE",
2074                                       "that open brace { should be on the previous line\n" .
2075                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
2076                         }
2077                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
2078                             $ctx =~ /\)\s*\;\s*$/ &&
2079                             defined $lines[$ctx_ln - 1])
2080                         {
2081                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
2082                                 if ($nindent > $indent) {
2083                                         WARN("TRAILING_SEMICOLON",
2084                                              "trailing semicolon indicates no statements, indent implies otherwise\n" .
2085                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
2086                                 }
2087                         }
2088                 }
2089
2090 # Check relative indent for conditionals and blocks.
2091                 if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
2092                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2093                                 ctx_statement_block($linenr, $realcnt, 0)
2094                                         if (!defined $stat);
2095                         my ($s, $c) = ($stat, $cond);
2096
2097                         substr($s, 0, length($c), '');
2098
2099                         # Make sure we remove the line prefixes as we have
2100                         # none on the first line, and are going to readd them
2101                         # where necessary.
2102                         $s =~ s/\n./\n/gs;
2103
2104                         # Find out how long the conditional actually is.
2105                         my @newlines = ($c =~ /\n/gs);
2106                         my $cond_lines = 1 + $#newlines;
2107
2108                         # We want to check the first line inside the block
2109                         # starting at the end of the conditional, so remove:
2110                         #  1) any blank line termination
2111                         #  2) any opening brace { on end of the line
2112                         #  3) any do (...) {
2113                         my $continuation = 0;
2114                         my $check = 0;
2115                         $s =~ s/^.*\bdo\b//;
2116                         $s =~ s/^\s*{//;
2117                         if ($s =~ s/^\s*\\//) {
2118                                 $continuation = 1;
2119                         }
2120                         if ($s =~ s/^\s*?\n//) {
2121                                 $check = 1;
2122                                 $cond_lines++;
2123                         }
2124
2125                         # Also ignore a loop construct at the end of a
2126                         # preprocessor statement.
2127                         if (($prevline =~ /^.\s*#\s*define\s/ ||
2128                             $prevline =~ /\\\s*$/) && $continuation == 0) {
2129                                 $check = 0;
2130                         }
2131
2132                         my $cond_ptr = -1;
2133                         $continuation = 0;
2134                         while ($cond_ptr != $cond_lines) {
2135                                 $cond_ptr = $cond_lines;
2136
2137                                 # If we see an #else/#elif then the code
2138                                 # is not linear.
2139                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
2140                                         $check = 0;
2141                                 }
2142
2143                                 # Ignore:
2144                                 #  1) blank lines, they should be at 0,
2145                                 #  2) preprocessor lines, and
2146                                 #  3) labels.
2147                                 if ($continuation ||
2148                                     $s =~ /^\s*?\n/ ||
2149                                     $s =~ /^\s*#\s*?/ ||
2150                                     $s =~ /^\s*$Ident\s*:/) {
2151                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
2152                                         if ($s =~ s/^.*?\n//) {
2153                                                 $cond_lines++;
2154                                         }
2155                                 }
2156                         }
2157
2158                         my (undef, $sindent) = line_stats("+" . $s);
2159                         my $stat_real = raw_line($linenr, $cond_lines);
2160
2161                         # Check if either of these lines are modified, else
2162                         # this is not this patch's fault.
2163                         if (!defined($stat_real) ||
2164                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
2165                                 $check = 0;
2166                         }
2167                         if (defined($stat_real) && $cond_lines > 1) {
2168                                 $stat_real = "[...]\n$stat_real";
2169                         }
2170
2171                         #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";
2172
2173                         if ($check && (($sindent % 8) != 0 ||
2174                             ($sindent <= $indent && $s ne ''))) {
2175                                 WARN("SUSPECT_CODE_INDENT",
2176                                      "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
2177                         }
2178                 }
2179
2180                 # Track the 'values' across context and added lines.
2181                 my $opline = $line; $opline =~ s/^./ /;
2182                 my ($curr_values, $curr_vars) =
2183                                 annotate_values($opline . "\n", $prev_values);
2184                 $curr_values = $prev_values . $curr_values;
2185                 if ($dbg_values) {
2186                         my $outline = $opline; $outline =~ s/\t/ /g;
2187                         print "$linenr > .$outline\n";
2188                         print "$linenr > $curr_values\n";
2189                         print "$linenr >  $curr_vars\n";
2190                 }
2191                 $prev_values = substr($curr_values, -1);
2192
2193 #ignore lines not being added
2194                 if ($line=~/^[^\+]/) {next;}
2195
2196 # TEST: allow direct testing of the type matcher.
2197                 if ($dbg_type) {
2198                         if ($line =~ /^.\s*$Declare\s*$/) {
2199                                 ERROR("TEST_TYPE",
2200                                       "TEST: is type\n" . $herecurr);
2201                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
2202                                 ERROR("TEST_NOT_TYPE",
2203                                       "TEST: is not type ($1 is)\n". $herecurr);
2204                         }
2205                         next;
2206                 }
2207 # TEST: allow direct testing of the attribute matcher.
2208                 if ($dbg_attr) {
2209                         if ($line =~ /^.\s*$Modifier\s*$/) {
2210                                 ERROR("TEST_ATTR",
2211                                       "TEST: is attr\n" . $herecurr);
2212                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
2213                                 ERROR("TEST_NOT_ATTR",
2214                                       "TEST: is not attr ($1 is)\n". $herecurr);
2215                         }
2216                         next;
2217                 }
2218
2219 # check for initialisation to aggregates open brace on the next line
2220                 if ($line =~ /^.\s*{/ &&
2221                     $prevline =~ /(?:^|[^=])=\s*$/) {
2222                         ERROR("OPEN_BRACE",
2223                               "that open brace { should be on the previous line\n" . $hereprev);
2224                 }
2225
2226 #
2227 # Checks which are anchored on the added line.
2228 #
2229
2230 # check for malformed paths in #include statements (uses RAW line)
2231                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
2232                         my $path = $1;
2233                         if ($path =~ m{//}) {
2234                                 ERROR("MALFORMED_INCLUDE",
2235                                       "malformed #include filename\n" . $herecurr);
2236                         }
2237                         if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
2238                                 ERROR("UAPI_INCLUDE",
2239                                       "No #include in ...include/uapi/... should use a uapi/ path prefix\n" . $herecurr);
2240                         }
2241                 }
2242
2243 # no C99 // comments
2244                 if ($line =~ m{//}) {
2245                         ERROR("C99_COMMENTS",
2246                               "do not use C99 // comments\n" . $herecurr);
2247                 }
2248                 # Remove C99 comments.
2249                 $line =~ s@//.*@@;
2250                 $opline =~ s@//.*@@;
2251
2252 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
2253 # the whole statement.
2254 #print "APW <$lines[$realline_next - 1]>\n";
2255                 if (defined $realline_next &&
2256                     exists $lines[$realline_next - 1] &&
2257                     !defined $suppress_export{$realline_next} &&
2258                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2259                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2260                         # Handle definitions which produce identifiers with
2261                         # a prefix:
2262                         #   XXX(foo);
2263                         #   EXPORT_SYMBOL(something_foo);
2264                         my $name = $1;
2265                         if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
2266                             $name =~ /^${Ident}_$2/) {
2267 #print "FOO C name<$name>\n";
2268                                 $suppress_export{$realline_next} = 1;
2269
2270                         } elsif ($stat !~ /(?:
2271                                 \n.}\s*$|
2272                                 ^.DEFINE_$Ident\(\Q$name\E\)|
2273                                 ^.DECLARE_$Ident\(\Q$name\E\)|
2274                                 ^.LIST_HEAD\(\Q$name\E\)|
2275                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
2276                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
2277                             )/x) {
2278 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
2279                                 $suppress_export{$realline_next} = 2;
2280                         } else {
2281                                 $suppress_export{$realline_next} = 1;
2282                         }
2283                 }
2284                 if (!defined $suppress_export{$linenr} &&
2285                     $prevline =~ /^.\s*$/ &&
2286                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2287                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2288 #print "FOO B <$lines[$linenr - 1]>\n";
2289                         $suppress_export{$linenr} = 2;
2290                 }
2291                 if (defined $suppress_export{$linenr} &&
2292                     $suppress_export{$linenr} == 2) {
2293                         WARN("EXPORT_SYMBOL",
2294                              "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
2295                 }
2296
2297 # check for global initialisers.
2298                 if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
2299                         ERROR("GLOBAL_INITIALISERS",
2300                               "do not initialise globals to 0 or NULL\n" .
2301                                 $herecurr);
2302                 }
2303 # check for static initialisers.
2304                 if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
2305                         ERROR("INITIALISED_STATIC",
2306                               "do not initialise statics to 0 or NULL\n" .
2307                                 $herecurr);
2308                 }
2309
2310 # check for static const char * arrays.
2311                 if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
2312                         WARN("STATIC_CONST_CHAR_ARRAY",
2313                              "static const char * array should probably be static const char * const\n" .
2314                                 $herecurr);
2315                }
2316
2317 # check for static char foo[] = "bar" declarations.
2318                 if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
2319                         WARN("STATIC_CONST_CHAR_ARRAY",
2320                              "static char array declaration should probably be static const char\n" .
2321                                 $herecurr);
2322                }
2323
2324 # check for declarations of struct pci_device_id
2325                 if ($line =~ /\bstruct\s+pci_device_id\s+\w+\s*\[\s*\]\s*\=\s*\{/) {
2326                         WARN("DEFINE_PCI_DEVICE_TABLE",
2327                              "Use DEFINE_PCI_DEVICE_TABLE for struct pci_device_id\n" . $herecurr);
2328                 }
2329
2330 # check for new typedefs, only function parameters and sparse annotations
2331 # make sense.
2332                 if ($line =~ /\btypedef\s/ &&
2333                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
2334                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
2335                     $line !~ /\b$typeTypedefs\b/ &&
2336                     $line !~ /\b__bitwise(?:__|)\b/) {
2337                         WARN("NEW_TYPEDEFS",
2338                              "do not add new typedefs\n" . $herecurr);
2339                 }
2340
2341 # * goes on variable not on type
2342                 # (char*[ const])
2343                 while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
2344                         #print "AA<$1>\n";
2345                         my ($from, $to) = ($2, $2);
2346
2347                         # Should start with a space.
2348                         $to =~ s/^(\S)/ $1/;
2349                         # Should not end with a space.
2350                         $to =~ s/\s+$//;
2351                         # '*'s should not have spaces between.
2352                         while ($to =~ s/\*\s+\*/\*\*/) {
2353                         }
2354
2355                         #print "from<$from> to<$to>\n";
2356                         if ($from ne $to) {
2357                                 ERROR("POINTER_LOCATION",
2358                                       "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
2359                         }
2360                 }
2361                 while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
2362                         #print "BB<$1>\n";
2363                         my ($from, $to, $ident) = ($2, $2, $3);
2364
2365                         # Should start with a space.
2366                         $to =~ s/^(\S)/ $1/;
2367                         # Should not end with a space.
2368                         $to =~ s/\s+$//;
2369                         # '*'s should not have spaces between.
2370                         while ($to =~ s/\*\s+\*/\*\*/) {
2371                         }
2372                         # Modifiers should have spaces.
2373                         $to =~ s/(\b$Modifier$)/$1 /;
2374
2375                         #print "from<$from> to<$to> ident<$ident>\n";
2376                         if ($from ne $to && $ident !~ /^$Modifier$/) {
2377                                 ERROR("POINTER_LOCATION",
2378                                       "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
2379                         }
2380                 }
2381
2382 # # no BUG() or BUG_ON()
2383 #               if ($line =~ /\b(BUG|BUG_ON)\b/) {
2384 #                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
2385 #                       print "$herecurr";
2386 #                       $clean = 0;
2387 #               }
2388
2389                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
2390                         WARN("LINUX_VERSION_CODE",
2391                              "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
2392                 }
2393
2394 # check for uses of printk_ratelimit
2395                 if ($line =~ /\bprintk_ratelimit\s*\(/) {
2396                         WARN("PRINTK_RATELIMITED",
2397 "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
2398                 }
2399
2400 # printk should use KERN_* levels.  Note that follow on printk's on the
2401 # same line do not need a level, so we use the current block context
2402 # to try and find and validate the current printk.  In summary the current
2403 # printk includes all preceding printk's which have no newline on the end.
2404 # we assume the first bad printk is the one to report.
2405                 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
2406                         my $ok = 0;
2407                         for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
2408                                 #print "CHECK<$lines[$ln - 1]\n";
2409                                 # we have a preceding printk if it ends
2410                                 # with "\n" ignore it, else it is to blame
2411                                 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
2412                                         if ($rawlines[$ln - 1] !~ m{\\n"}) {
2413                                                 $ok = 1;
2414                                         }
2415                                         last;
2416                                 }
2417                         }
2418                         if ($ok == 0) {
2419                                 WARN("PRINTK_WITHOUT_KERN_LEVEL",
2420                                      "printk() should include KERN_ facility level\n" . $herecurr);
2421                         }
2422                 }
2423
2424                 if ($line =~ /\bprintk\s*\(\s*KERN_([A-Z]+)/) {
2425                         my $orig = $1;
2426                         my $level = lc($orig);
2427                         $level = "warn" if ($level eq "warning");
2428                         my $level2 = $level;
2429                         $level2 = "dbg" if ($level eq "debug");
2430                         WARN("PREFER_PR_LEVEL",
2431                              "Prefer netdev_$level2(netdev, ... then dev_$level2(dev, ... then pr_$level(...  to printk(KERN_$orig ...\n" . $herecurr);
2432                 }
2433
2434                 if ($line =~ /\bpr_warning\s*\(/) {
2435                         WARN("PREFER_PR_LEVEL",
2436                              "Prefer pr_warn(... to pr_warning(...\n" . $herecurr);
2437                 }
2438
2439                 if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
2440                         my $orig = $1;
2441                         my $level = lc($orig);
2442                         $level = "warn" if ($level eq "warning");
2443                         $level = "dbg" if ($level eq "debug");
2444                         WARN("PREFER_DEV_LEVEL",
2445                              "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr);
2446                 }
2447
2448 # function brace can't be on same line, except for #defines of do while,
2449 # or if closed on same line
2450                 if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
2451                     !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
2452                         ERROR("OPEN_BRACE",
2453                               "open brace '{' following function declarations go on the next line\n" . $herecurr);
2454                 }
2455
2456 # open braces for enum, union and struct go on the same line.
2457                 if ($line =~ /^.\s*{/ &&
2458                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
2459                         ERROR("OPEN_BRACE",
2460                               "open brace '{' following $1 go on the same line\n" . $hereprev);
2461                 }
2462
2463 # missing space after union, struct or enum definition
2464                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
2465                     WARN("SPACING",
2466                          "missing space after $1 definition\n" . $herecurr);
2467                 }
2468
2469 # check for spacing round square brackets; allowed:
2470 #  1. with a type on the left -- int [] a;
2471 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
2472 #  3. inside a curly brace -- = { [0...10] = 5 }
2473                 while ($line =~ /(.*?\s)\[/g) {
2474                         my ($where, $prefix) = ($-[1], $1);
2475                         if ($prefix !~ /$Type\s+$/ &&
2476                             ($where != 0 || $prefix !~ /^.\s+$/) &&
2477                             $prefix !~ /[{,]\s+$/) {
2478                                 ERROR("BRACKET_SPACE",
2479                                       "space prohibited before open square bracket '['\n" . $herecurr);
2480                         }
2481                 }
2482
2483 # check for spaces between functions and their parentheses.
2484                 while ($line =~ /($Ident)\s+\(/g) {
2485                         my $name = $1;
2486                         my $ctx_before = substr($line, 0, $-[1]);
2487                         my $ctx = "$ctx_before$name";
2488
2489                         # Ignore those directives where spaces _are_ permitted.
2490                         if ($name =~ /^(?:
2491                                 if|for|while|switch|return|case|
2492                                 volatile|__volatile__|
2493                                 __attribute__|format|__extension__|
2494                                 asm|__asm__)$/x)
2495                         {
2496
2497                         # cpp #define statements have non-optional spaces, ie
2498                         # if there is a space between the name and the open
2499                         # parenthesis it is simply not a parameter group.
2500                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
2501
2502                         # cpp #elif statement condition may start with a (
2503                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
2504
2505                         # If this whole things ends with a type its most
2506                         # likely a typedef for a function.
2507                         } elsif ($ctx =~ /$Type$/) {
2508
2509                         } else {
2510                                 WARN("SPACING",
2511                                      "space prohibited between function name and open parenthesis '('\n" . $herecurr);
2512                         }
2513                 }
2514
2515 # check for whitespace before a non-naked semicolon
2516                 if ($line =~ /^\+.*\S\s+;/) {
2517                         CHK("SPACING",
2518                             "space prohibited before semicolon\n" . $herecurr);
2519                 }
2520
2521 # Check operator spacing.
2522                 if (!($line=~/\#\s*include/)) {
2523                         my $ops = qr{
2524                                 <<=|>>=|<=|>=|==|!=|
2525                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
2526                                 =>|->|<<|>>|<|>|=|!|~|
2527                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
2528                                 \?|:
2529                         }x;
2530                         my @elements = split(/($ops|;)/, $opline);
2531                         my $off = 0;
2532
2533                         my $blank = copy_spacing($opline);
2534
2535                         for (my $n = 0; $n < $#elements; $n += 2) {
2536                                 $off += length($elements[$n]);
2537
2538                                 # Pick up the preceding and succeeding characters.
2539                                 my $ca = substr($opline, 0, $off);
2540                                 my $cc = '';
2541                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
2542                                         $cc = substr($opline, $off + length($elements[$n + 1]));
2543                                 }
2544                                 my $cb = "$ca$;$cc";
2545
2546                                 my $a = '';
2547                                 $a = 'V' if ($elements[$n] ne '');
2548                                 $a = 'W' if ($elements[$n] =~ /\s$/);
2549                                 $a = 'C' if ($elements[$n] =~ /$;$/);
2550                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2551                                 $a = 'O' if ($elements[$n] eq '');
2552                                 $a = 'E' if ($ca =~ /^\s*$/);
2553
2554                                 my $op = $elements[$n + 1];
2555
2556                                 my $c = '';
2557                                 if (defined $elements[$n + 2]) {
2558                                         $c = 'V' if ($elements[$n + 2] ne '');
2559                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
2560                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
2561                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2562                                         $c = 'O' if ($elements[$n + 2] eq '');
2563                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2564                                 } else {
2565                                         $c = 'E';
2566                                 }
2567
2568                                 my $ctx = "${a}x${c}";
2569
2570                                 my $at = "(ctx:$ctx)";
2571
2572                                 my $ptr = substr($blank, 0, $off) . "^";
2573                                 my $hereptr = "$hereline$ptr\n";
2574
2575                                 # Pull out the value of this operator.
2576                                 my $op_type = substr($curr_values, $off + 1, 1);
2577
2578                                 # Get the full operator variant.
2579                                 my $opv = $op . substr($curr_vars, $off, 1);
2580
2581                                 # Ignore operators passed as parameters.
2582                                 if ($op_type ne 'V' &&
2583                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2584
2585 #                               # Ignore comments
2586 #                               } elsif ($op =~ /^$;+$/) {
2587
2588                                 # ; should have either the end of line or a space or \ after it
2589                                 } elsif ($op eq ';') {
2590                                         if ($ctx !~ /.x[WEBC]/ &&
2591                                             $cc !~ /^\\/ && $cc !~ /^;/) {
2592                                                 ERROR("SPACING",
2593                                                       "space required after that '$op' $at\n" . $hereptr);
2594                                         }
2595
2596                                 # // is a comment
2597                                 } elsif ($op eq '//') {
2598
2599                                 # No spaces for:
2600                                 #   ->
2601                                 #   :   when part of a bitfield
2602                                 } elsif ($op eq '->' || $opv eq ':B') {
2603                                         if ($ctx =~ /Wx.|.xW/) {
2604                                                 ERROR("SPACING",
2605                                                       "spaces prohibited around that '$op' $at\n" . $hereptr);
2606                                         }
2607
2608                                 # , must have a space on the right.
2609                                 } elsif ($op eq ',') {
2610                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
2611                                                 ERROR("SPACING",
2612                                                       "space required after that '$op' $at\n" . $hereptr);
2613                                         }
2614
2615                                 # '*' as part of a type definition -- reported already.
2616                                 } elsif ($opv eq '*_') {
2617                                         #warn "'*' is part of type\n";
2618
2619                                 # unary operators should have a space before and
2620                                 # none after.  May be left adjacent to another
2621                                 # unary operator, or a cast
2622                                 } elsif ($op eq '!' || $op eq '~' ||
2623                                          $opv eq '*U' || $opv eq '-U' ||
2624                                          $opv eq '&U' || $opv eq '&&U') {
2625                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2626                                                 ERROR("SPACING",
2627                                                       "space required before that '$op' $at\n" . $hereptr);
2628                                         }
2629                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2630                                                 # A unary '*' may be const
2631
2632                                         } elsif ($ctx =~ /.xW/) {
2633                                                 ERROR("SPACING",
2634                                                       "space prohibited after that '$op' $at\n" . $hereptr);
2635                                         }
2636
2637                                 # unary ++ and unary -- are allowed no space on one side.
2638                                 } elsif ($op eq '++' or $op eq '--') {
2639                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2640                                                 ERROR("SPACING",
2641                                                       "space required one side of that '$op' $at\n" . $hereptr);
2642                                         }
2643                                         if ($ctx =~ /Wx[BE]/ ||
2644                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2645                                                 ERROR("SPACING",
2646                                                       "space prohibited before that '$op' $at\n" . $hereptr);
2647                                         }
2648                                         if ($ctx =~ /ExW/) {
2649                                                 ERROR("SPACING",
2650                                                       "space prohibited after that '$op' $at\n" . $hereptr);
2651                                         }
2652
2653
2654                                 # << and >> may either have or not have spaces both sides
2655                                 } elsif ($op eq '<<' or $op eq '>>' or
2656                                          $op eq '&' or $op eq '^' or $op eq '|' or
2657                                          $op eq '+' or $op eq '-' or
2658                                          $op eq '*' or $op eq '/' or
2659                                          $op eq '%')
2660                                 {
2661                                         if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
2662                                                 ERROR("SPACING",
2663                                                       "need consistent spacing around '$op' $at\n" .
2664                                                         $hereptr);
2665                                         }
2666
2667                                 # A colon needs no spaces before when it is
2668                                 # terminating a case value or a label.
2669                                 } elsif ($opv eq ':C' || $opv eq ':L') {
2670                                         if ($ctx =~ /Wx./) {
2671                                                 ERROR("SPACING",
2672                                                       "space prohibited before that '$op' $at\n" . $hereptr);
2673                                         }
2674
2675                                 # All the others need spaces both sides.
2676                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
2677                                         my $ok = 0;
2678
2679                                         # Ignore email addresses <foo@bar>
2680                                         if (($op eq '<' &&
2681                                              $cc =~ /^\S+\@\S+>/) ||
2682                                             ($op eq '>' &&
2683                                              $ca =~ /<\S+\@\S+$/))
2684                                         {
2685                                                 $ok = 1;
2686                                         }
2687
2688                                         # Ignore ?:
2689                                         if (($opv eq ':O' && $ca =~ /\?$/) ||
2690                                             ($op eq '?' && $cc =~ /^:/)) {
2691                                                 $ok = 1;
2692                                         }
2693
2694                                         if ($ok == 0) {
2695                                                 ERROR("SPACING",
2696                                                       "spaces required around that '$op' $at\n" . $hereptr);
2697                                         }
2698                                 }
2699                                 $off += length($elements[$n + 1]);
2700                         }
2701                 }
2702
2703 # check for multiple assignments
2704                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
2705                         CHK("MULTIPLE_ASSIGNMENTS",
2706                             "multiple assignments should be avoided\n" . $herecurr);
2707                 }
2708
2709 ## # check for multiple declarations, allowing for a function declaration
2710 ## # continuation.
2711 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
2712 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
2713 ##
2714 ##                      # Remove any bracketed sections to ensure we do not
2715 ##                      # falsly report the parameters of functions.
2716 ##                      my $ln = $line;
2717 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
2718 ##                      }
2719 ##                      if ($ln =~ /,/) {
2720 ##                              WARN("MULTIPLE_DECLARATION",
2721 ##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
2722 ##                      }
2723 ##              }
2724
2725 #need space before brace following if, while, etc
2726                 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
2727                     $line =~ /do{/) {
2728                         ERROR("SPACING",
2729                               "space required before the open brace '{'\n" . $herecurr);
2730                 }
2731
2732 # closing brace should have a space following it when it has anything
2733 # on the line
2734                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
2735                         ERROR("SPACING",
2736                               "space required after that close brace '}'\n" . $herecurr);
2737                 }
2738
2739 # check spacing on square brackets
2740                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2741                         ERROR("SPACING",
2742                               "space prohibited after that open square bracket '['\n" . $herecurr);
2743                 }
2744                 if ($line =~ /\s\]/) {
2745                         ERROR("SPACING",
2746                               "space prohibited before that close square bracket ']'\n" . $herecurr);
2747                 }
2748
2749 # check spacing on parentheses
2750                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2751                     $line !~ /for\s*\(\s+;/) {
2752                         ERROR("SPACING",
2753                               "space prohibited after that open parenthesis '('\n" . $herecurr);
2754                 }
2755                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2756                     $line !~ /for\s*\(.*;\s+\)/ &&
2757                     $line !~ /:\s+\)/) {
2758                         ERROR("SPACING",
2759                               "space prohibited before that close parenthesis ')'\n" . $herecurr);
2760                 }
2761
2762 #goto labels aren't indented, allow a single space however
2763                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
2764                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
2765                         WARN("INDENTED_LABEL",
2766                              "labels should not be indented\n" . $herecurr);
2767                 }
2768
2769 # Return is not a function.
2770                 if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2771                         my $spacing = $1;
2772                         my $value = $2;
2773
2774                         # Flatten any parentheses
2775                         $value =~ s/\(/ \(/g;
2776                         $value =~ s/\)/\) /g;
2777                         while ($value =~ s/\[[^\[\]]*\]/1/ ||
2778                                $value !~ /(?:$Ident|-?$Constant)\s*
2779                                              $Compare\s*
2780                                              (?:$Ident|-?$Constant)/x &&
2781                                $value =~ s/\([^\(\)]*\)/1/) {
2782                         }
2783 #print "value<$value>\n";
2784                         if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/) {
2785                                 ERROR("RETURN_PARENTHESES",
2786                                       "return is not a function, parentheses are not required\n" . $herecurr);
2787
2788                         } elsif ($spacing !~ /\s+/) {
2789                                 ERROR("SPACING",
2790                                       "space required before the open parenthesis '('\n" . $herecurr);
2791                         }
2792                 }
2793 # Return of what appears to be an errno should normally be -'ve
2794                 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2795                         my $name = $1;
2796                         if ($name ne 'EOF' && $name ne 'ERROR') {
2797                                 WARN("USE_NEGATIVE_ERRNO",
2798                                      "return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2799                         }
2800                 }
2801
2802 # Need a space before open parenthesis after if, while etc
2803                 if ($line=~/\b(if|while|for|switch)\(/) {
2804                         ERROR("SPACING", "space required before the open parenthesis '('\n" . $herecurr);
2805                 }
2806
2807 # Check for illegal assignment in if conditional -- and check for trailing
2808 # statements after the conditional.
2809                 if ($line =~ /do\s*(?!{)/) {
2810                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2811                                 ctx_statement_block($linenr, $realcnt, 0)
2812                                         if (!defined $stat);
2813                         my ($stat_next) = ctx_statement_block($line_nr_next,
2814                                                 $remain_next, $off_next);
2815                         $stat_next =~ s/\n./\n /g;
2816                         ##print "stat<$stat> stat_next<$stat_next>\n";
2817
2818                         if ($stat_next =~ /^\s*while\b/) {
2819                                 # If the statement carries leading newlines,
2820                                 # then count those as offsets.
2821                                 my ($whitespace) =
2822                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2823                                 my $offset =
2824                                         statement_rawlines($whitespace) - 1;
2825
2826                                 $suppress_whiletrailers{$line_nr_next +
2827                                                                 $offset} = 1;
2828                         }
2829                 }
2830                 if (!defined $suppress_whiletrailers{$linenr} &&
2831                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2832                         my ($s, $c) = ($stat, $cond);
2833
2834                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2835                                 ERROR("ASSIGN_IN_IF",
2836                                       "do not use assignment in if condition\n" . $herecurr);
2837                         }
2838
2839                         # Find out what is on the end of the line after the
2840                         # conditional.
2841                         substr($s, 0, length($c), '');
2842                         $s =~ s/\n.*//g;
2843                         $s =~ s/$;//g;  # Remove any comments
2844                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2845                             $c !~ /}\s*while\s*/)
2846                         {
2847                                 # Find out how long the conditional actually is.
2848                                 my @newlines = ($c =~ /\n/gs);
2849                                 my $cond_lines = 1 + $#newlines;
2850                                 my $stat_real = '';
2851
2852                                 $stat_real = raw_line($linenr, $cond_lines)
2853                                                         . "\n" if ($cond_lines);
2854                                 if (defined($stat_real) && $cond_lines > 1) {
2855                                         $stat_real = "[...]\n$stat_real";
2856                                 }
2857
2858                                 ERROR("TRAILING_STATEMENTS",
2859                                       "trailing statements should be on next line\n" . $herecurr . $stat_real);
2860                         }
2861                 }
2862
2863 # Check for bitwise tests written as boolean
2864                 if ($line =~ /
2865                         (?:
2866                                 (?:\[|\(|\&\&|\|\|)
2867                                 \s*0[xX][0-9]+\s*
2868                                 (?:\&\&|\|\|)
2869                         |
2870                                 (?:\&\&|\|\|)
2871                                 \s*0[xX][0-9]+\s*
2872                                 (?:\&\&|\|\||\)|\])
2873                         )/x)
2874                 {
2875                         WARN("HEXADECIMAL_BOOLEAN_TEST",
2876                              "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2877                 }
2878
2879 # if and else should not have general statements after it
2880                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2881                         my $s = $1;
2882                         $s =~ s/$;//g;  # Remove any comments
2883                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2884                                 ERROR("TRAILING_STATEMENTS",
2885                                       "trailing statements should be on next line\n" . $herecurr);
2886                         }
2887                 }
2888 # if should not continue a brace
2889                 if ($line =~ /}\s*if\b/) {
2890                         ERROR("TRAILING_STATEMENTS",
2891                               "trailing statements should be on next line\n" .
2892                                 $herecurr);
2893                 }
2894 # case and default should not have general statements after them
2895                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2896                     $line !~ /\G(?:
2897                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2898                         \s*return\s+
2899                     )/xg)
2900                 {
2901                         ERROR("TRAILING_STATEMENTS",
2902                               "trailing statements should be on next line\n" . $herecurr);
2903                 }
2904
2905                 # Check for }<nl>else {, these must be at the same
2906                 # indent level to be relevant to each other.
2907                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2908                                                 $previndent == $indent) {
2909                         ERROR("ELSE_AFTER_BRACE",
2910                               "else should follow close brace '}'\n" . $hereprev);
2911                 }
2912
2913                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2914                                                 $previndent == $indent) {
2915                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2916
2917                         # Find out what is on the end of the line after the
2918                         # conditional.
2919                         substr($s, 0, length($c), '');
2920                         $s =~ s/\n.*//g;
2921
2922                         if ($s =~ /^\s*;/) {
2923                                 ERROR("WHILE_AFTER_BRACE",
2924                                       "while should follow close brace '}'\n" . $hereprev);
2925                         }
2926                 }
2927
2928 #CamelCase
2929                 while ($line =~ m{($Constant|$Lval)}g) {
2930                         my $var = $1;
2931                         if ($var !~ /$Constant/ &&
2932                             $var =~ /[A-Z]\w*[a-z]|[a-z]\w*[A-Z]/ &&
2933                             $var !~ /"^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&
2934                             !defined $camelcase{$var}) {
2935                                 $camelcase{$var} = 1;
2936                                 WARN("CAMELCASE",
2937                                      "Avoid CamelCase: <$var>\n" . $herecurr);
2938                         }
2939                 }
2940
2941 #no spaces allowed after \ in define
2942                 if ($line=~/\#\s*define.*\\\s$/) {
2943                         WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
2944                              "Whitepspace after \\ makes next lines useless\n" . $herecurr);
2945                 }
2946
2947 #warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
2948                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
2949                         my $file = "$1.h";
2950                         my $checkfile = "include/linux/$file";
2951                         if (-f "$root/$checkfile" &&
2952                             $realfile ne $checkfile &&
2953                             $1 !~ /$allowed_asm_includes/)
2954                         {
2955                                 if ($realfile =~ m{^arch/}) {
2956                                         CHK("ARCH_INCLUDE_LINUX",
2957                                             "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2958                                 } else {
2959                                         WARN("INCLUDE_LINUX",
2960                                              "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2961                                 }
2962                         }
2963                 }
2964
2965 # multi-statement macros should be enclosed in a do while loop, grab the
2966 # first statement and ensure its the whole macro if its not enclosed
2967 # in a known good container
2968                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
2969                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2970                         my $ln = $linenr;
2971                         my $cnt = $realcnt;
2972                         my ($off, $dstat, $dcond, $rest);
2973                         my $ctx = '';
2974                         ($dstat, $dcond, $ln, $cnt, $off) =
2975                                 ctx_statement_block($linenr, $realcnt, 0);
2976                         $ctx = $dstat;
2977                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2978                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2979
2980                         $dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//;
2981                         $dstat =~ s/$;//g;
2982                         $dstat =~ s/\\\n.//g;
2983                         $dstat =~ s/^\s*//s;
2984                         $dstat =~ s/\s*$//s;
2985
2986                         # Flatten any parentheses and braces
2987                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2988                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
2989                                $dstat =~ s/\[[^\[\]]*\]/1/)
2990                         {
2991                         }
2992
2993                         # Flatten any obvious string concatentation.
2994                         while ($dstat =~ s/("X*")\s*$Ident/$1/ ||
2995                                $dstat =~ s/$Ident\s*("X*")/$1/)
2996                         {
2997                         }
2998
2999                         my $exceptions = qr{
3000                                 $Declare|
3001                                 module_param_named|
3002                                 MODULE_PARM_DESC|
3003                                 DECLARE_PER_CPU|
3004                                 DEFINE_PER_CPU|
3005                                 __typeof__\(|
3006                                 union|
3007                                 struct|
3008                                 \.$Ident\s*=\s*|
3009                                 ^\"|\"$
3010                         }x;
3011                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
3012                         if ($dstat ne '' &&
3013                             $dstat !~ /^(?:$Ident|-?$Constant),$/ &&                    # 10, // foo(),
3014                             $dstat !~ /^(?:$Ident|-?$Constant);$/ &&                    # foo();
3015                             $dstat !~ /^[!~-]?(?:$Ident|$Constant)$/ &&         # 10 // foo() // !foo // ~foo // -foo
3016                             $dstat !~ /^'X'$/ &&                                        # character constants
3017                             $dstat !~ /$exceptions/ &&
3018                             $dstat !~ /^\.$Ident\s*=/ &&                                # .foo =
3019                             $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&       # do {...} while (...); // do {...} while (...)
3020                             $dstat !~ /^for\s*$Constant$/ &&                            # for (...)
3021                             $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&   # for (...) bar()
3022                             $dstat !~ /^do\s*{/ &&                                      # do {...
3023                             $dstat !~ /^\({/)                                           # ({...
3024                         {
3025                                 $ctx =~ s/\n*$//;
3026                                 my $herectx = $here . "\n";
3027                                 my $cnt = statement_rawlines($ctx);
3028
3029                                 for (my $n = 0; $n < $cnt; $n++) {
3030                                         $herectx .= raw_line($linenr, $n) . "\n";
3031                                 }
3032
3033                                 if ($dstat =~ /;/) {
3034                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
3035                                               "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
3036                                 } else {
3037                                         ERROR("COMPLEX_MACRO",
3038                                               "Macros with complex values should be enclosed in parenthesis\n" . "$herectx");
3039                                 }
3040                         }
3041
3042 # check for line continuations outside of #defines, preprocessor #, and asm
3043
3044                 } else {
3045                         if ($prevline !~ /^..*\\$/ &&
3046                             $line !~ /^\+\s*\#.*\\$/ &&         # preprocessor
3047                             $line !~ /^\+.*\b(__asm__|asm)\b.*\\$/ &&   # asm
3048                             $line =~ /^\+.*\\$/) {
3049                                 WARN("LINE_CONTINUATIONS",
3050                                      "Avoid unnecessary line continuations\n" . $herecurr);
3051                         }
3052                 }
3053
3054 # do {} while (0) macro tests:
3055 # single-statement macros do not need to be enclosed in do while (0) loop,
3056 # macro should not end with a semicolon
3057                 if ($^V && $^V ge 5.10.0 &&
3058                     $realfile !~ m@/vmlinux.lds.h$@ &&
3059                     $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
3060                         my $ln = $linenr;
3061                         my $cnt = $realcnt;
3062                         my ($off, $dstat, $dcond, $rest);
3063                         my $ctx = '';
3064                         ($dstat, $dcond, $ln, $cnt, $off) =
3065                                 ctx_statement_block($linenr, $realcnt, 0);
3066                         $ctx = $dstat;
3067
3068                         $dstat =~ s/\\\n.//g;
3069
3070                         if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
3071                                 my $stmts = $2;
3072                                 my $semis = $3;
3073
3074                                 $ctx =~ s/\n*$//;
3075                                 my $cnt = statement_rawlines($ctx);
3076                                 my $herectx = $here . "\n";
3077
3078                                 for (my $n = 0; $n < $cnt; $n++) {
3079                                         $herectx .= raw_line($linenr, $n) . "\n";
3080                                 }
3081
3082                                 if (($stmts =~ tr/;/;/) == 1 &&
3083                                     $stmts !~ /^\s*(if|while|for|switch)\b/) {
3084                                         WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
3085                                              "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
3086                                 }
3087                                 if (defined $semis && $semis ne "") {
3088                                         WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
3089                                              "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
3090                                 }
3091                         }
3092                 }
3093
3094 # make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
3095 # all assignments may have only one of the following with an assignment:
3096 #       .
3097 #       ALIGN(...)
3098 #       VMLINUX_SYMBOL(...)
3099                 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
3100                         WARN("MISSING_VMLINUX_SYMBOL",
3101                              "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
3102                 }
3103
3104 # check for redundant bracing round if etc
3105                 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
3106                         my ($level, $endln, @chunks) =
3107                                 ctx_statement_full($linenr, $realcnt, 1);
3108                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
3109                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
3110                         if ($#chunks > 0 && $level == 0) {
3111                                 my @allowed = ();
3112                                 my $allow = 0;
3113                                 my $seen = 0;
3114                                 my $herectx = $here . "\n";
3115                                 my $ln = $linenr - 1;
3116                                 for my $chunk (@chunks) {
3117                                         my ($cond, $block) = @{$chunk};
3118
3119                                         # If the condition carries leading newlines, then count those as offsets.
3120                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
3121                                         my $offset = statement_rawlines($whitespace) - 1;
3122
3123                                         $allowed[$allow] = 0;
3124                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
3125
3126                                         # We have looked at and allowed this specific line.
3127                                         $suppress_ifbraces{$ln + $offset} = 1;
3128
3129                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
3130                                         $ln += statement_rawlines($block) - 1;
3131
3132                                         substr($block, 0, length($cond), '');
3133
3134                                         $seen++ if ($block =~ /^\s*{/);
3135
3136                                         #print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
3137                                         if (statement_lines($cond) > 1) {
3138                                                 #print "APW: ALLOWED: cond<$cond>\n";
3139                                                 $allowed[$allow] = 1;
3140                                         }
3141                                         if ($block =~/\b(?:if|for|while)\b/) {
3142                                                 #print "APW: ALLOWED: block<$block>\n";
3143                                                 $allowed[$allow] = 1;
3144                                         }
3145                                         if (statement_block_size($block) > 1) {
3146                                                 #print "APW: ALLOWED: lines block<$block>\n";
3147                                                 $allowed[$allow] = 1;
3148                                         }
3149                                         $allow++;
3150                                 }
3151                                 if ($seen) {
3152                                         my $sum_allowed = 0;
3153                                         foreach (@allowed) {
3154                                                 $sum_allowed += $_;
3155                                         }
3156                                         if ($sum_allowed == 0) {
3157                                                 WARN("BRACES",
3158                                                      "braces {} are not necessary for any arm of this statement\n" . $herectx);
3159                                         } elsif ($sum_allowed != $allow &&
3160                                                  $seen != $allow) {
3161                                                 CHK("BRACES",
3162                                                     "braces {} should be used on all arms of this statement\n" . $herectx);
3163                                         }
3164                                 }
3165                         }
3166                 }
3167                 if (!defined $suppress_ifbraces{$linenr - 1} &&
3168                                         $line =~ /\b(if|while|for|else)\b/) {
3169                         my $allowed = 0;
3170
3171                         # Check the pre-context.
3172                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
3173                                 #print "APW: ALLOWED: pre<$1>\n";
3174                                 $allowed = 1;
3175                         }
3176
3177                         my ($level, $endln, @chunks) =
3178                                 ctx_statement_full($linenr, $realcnt, $-[0]);
3179
3180                         # Check the condition.
3181                         my ($cond, $block) = @{$chunks[0]};
3182                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
3183                         if (defined $cond) {
3184                                 substr($block, 0, length($cond), '');
3185                         }
3186                         if (statement_lines($cond) > 1) {
3187                                 #print "APW: ALLOWED: cond<$cond>\n";
3188                                 $allowed = 1;
3189                         }
3190                         if ($block =~/\b(?:if|for|while)\b/) {
3191                                 #print "APW: ALLOWED: block<$block>\n";
3192                                 $allowed = 1;
3193                         }
3194                         if (statement_block_size($block) > 1) {
3195                                 #print "APW: ALLOWED: lines block<$block>\n";
3196                                 $allowed = 1;
3197                         }
3198                         # Check the post-context.
3199                         if (defined $chunks[1]) {
3200                                 my ($cond, $block) = @{$chunks[1]};
3201                                 if (defined $cond) {
3202                                         substr($block, 0, length($cond), '');
3203                                 }
3204                                 if ($block =~ /^\s*\{/) {
3205                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
3206                                         $allowed = 1;
3207                                 }
3208                         }
3209                         if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
3210                                 my $herectx = $here . "\n";
3211                                 my $cnt = statement_rawlines($block);
3212
3213                                 for (my $n = 0; $n < $cnt; $n++) {
3214                                         $herectx .= raw_line($linenr, $n) . "\n";
3215                                 }
3216
3217                                 WARN("BRACES",
3218                                      "braces {} are not necessary for single statement blocks\n" . $herectx);
3219                         }
3220                 }
3221
3222 # check for unnecessary blank lines around braces
3223                 if (($line =~ /^..*}\s*$/ && $prevline =~ /^.\s*$/)) {
3224                         CHK("BRACES",
3225                             "Blank lines aren't necessary before a close brace '}'\n" . $hereprev);
3226                 }
3227                 if (($line =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
3228                         CHK("BRACES",
3229                             "Blank lines aren't necessary after an open brace '{'\n" . $hereprev);
3230                 }
3231
3232 # no volatiles please
3233                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
3234                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
3235                         WARN("VOLATILE",
3236                              "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
3237                 }
3238
3239 # warn about #if 0
3240                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
3241                         CHK("REDUNDANT_CODE",
3242                             "if this code is redundant consider removing it\n" .
3243                                 $herecurr);
3244                 }
3245
3246 # check for needless "if (<foo>) fn(<foo>)" uses
3247                 if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
3248                         my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;';
3249                         if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) {
3250                                 WARN('NEEDLESS_IF',
3251                                      "$1(NULL) is safe this check is probably not required\n" . $hereprev);
3252                         }
3253                 }
3254
3255 # prefer usleep_range over udelay
3256                 if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) {
3257                         # ignore udelay's < 10, however
3258                         if (! ($1 < 10) ) {
3259                                 CHK("USLEEP_RANGE",
3260                                     "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line);
3261                         }
3262                 }
3263
3264 # warn about unexpectedly long msleep's
3265                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
3266                         if ($1 < 20) {
3267                                 WARN("MSLEEP",
3268                                      "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
3269                         }
3270                 }
3271
3272 # warn about #ifdefs in C files
3273 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
3274 #                       print "#ifdef in C files should be avoided\n";
3275 #                       print "$herecurr";
3276 #                       $clean = 0;
3277 #               }
3278
3279 # warn about spacing in #ifdefs
3280                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
3281                         ERROR("SPACING",
3282                               "exactly one space required after that #$1\n" . $herecurr);
3283                 }
3284
3285 # check for spinlock_t definitions without a comment.
3286                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
3287                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
3288                         my $which = $1;
3289                         if (!ctx_has_comment($first_line, $linenr)) {
3290                                 CHK("UNCOMMENTED_DEFINITION",
3291                                     "$1 definition without comment\n" . $herecurr);
3292                         }
3293                 }
3294 # check for memory barriers without a comment.
3295                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
3296                         if (!ctx_has_comment($first_line, $linenr)) {
3297                                 CHK("MEMORY_BARRIER",
3298                                     "memory barrier without comment\n" . $herecurr);
3299                         }
3300                 }
3301 # check of hardware specific defines
3302                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
3303                         CHK("ARCH_DEFINES",
3304                             "architecture specific defines should be avoided\n" .  $herecurr);
3305                 }
3306
3307 # Check that the storage class is at the beginning of a declaration
3308                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
3309                         WARN("STORAGE_CLASS",
3310                              "storage class should be at the beginning of the declaration\n" . $herecurr)
3311                 }
3312
3313 # check the location of the inline attribute, that it is between
3314 # storage class and type.
3315                 if ($line =~ /\b$Type\s+$Inline\b/ ||
3316                     $line =~ /\b$Inline\s+$Storage\b/) {
3317                         ERROR("INLINE_LOCATION",
3318                               "inline keyword should sit between storage class and type\n" . $herecurr);
3319                 }
3320
3321 # Check for __inline__ and __inline, prefer inline
3322                 if ($line =~ /\b(__inline__|__inline)\b/) {
3323                         WARN("INLINE",
3324                              "plain inline is preferred over $1\n" . $herecurr);
3325                 }
3326
3327 # Check for __attribute__ packed, prefer __packed
3328                 if ($line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
3329                         WARN("PREFER_PACKED",
3330                              "__packed is preferred over __attribute__((packed))\n" . $herecurr);
3331                 }
3332
3333 # Check for __attribute__ aligned, prefer __aligned
3334                 if ($line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
3335                         WARN("PREFER_ALIGNED",
3336                              "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
3337                 }
3338
3339 # Check for __attribute__ format(printf, prefer __printf
3340                 if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
3341                         WARN("PREFER_PRINTF",
3342                              "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr);
3343                 }
3344
3345 # Check for __attribute__ format(scanf, prefer __scanf
3346                 if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
3347                         WARN("PREFER_SCANF",
3348                              "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr);
3349                 }
3350
3351 # check for sizeof(&)
3352                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
3353                         WARN("SIZEOF_ADDRESS",
3354                              "sizeof(& should be avoided\n" . $herecurr);
3355                 }
3356
3357 # check for sizeof without parenthesis
3358                 if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
3359                         WARN("SIZEOF_PARENTHESIS",
3360                              "sizeof $1 should be sizeof($1)\n" . $herecurr);
3361                 }
3362
3363 # check for line continuations in quoted strings with odd counts of "
3364                 if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
3365                         WARN("LINE_CONTINUATIONS",
3366                              "Avoid line continuations in quoted strings\n" . $herecurr);
3367                 }
3368
3369 # check for struct spinlock declarations
3370                 if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
3371                         WARN("USE_SPINLOCK_T",
3372                              "struct spinlock should be spinlock_t\n" . $herecurr);
3373                 }
3374
3375 # Check for misused memsets
3376                 if ($^V && $^V ge 5.10.0 &&
3377                     defined $stat &&
3378                     $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) {
3379
3380                         my $ms_addr = $2;
3381                         my $ms_val = $7;
3382                         my $ms_size = $12;
3383
3384                         if ($ms_size =~ /^(0x|)0$/i) {
3385                                 ERROR("MEMSET",
3386                                       "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
3387                         } elsif ($ms_size =~ /^(0x|)1$/i) {
3388                                 WARN("MEMSET",
3389                                      "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
3390                         }
3391                 }
3392
3393 # typecasts on min/max could be min_t/max_t
3394                 if ($^V && $^V ge 5.10.0 &&
3395                     defined $stat &&
3396                     $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
3397                         if (defined $2 || defined $7) {
3398                                 my $call = $1;
3399                                 my $cast1 = deparenthesize($2);
3400                                 my $arg1 = $3;
3401                                 my $cast2 = deparenthesize($7);
3402                                 my $arg2 = $8;
3403                                 my $cast;
3404
3405                                 if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) {
3406                                         $cast = "$cast1 or $cast2";
3407                                 } elsif ($cast1 ne "") {
3408                                         $cast = $cast1;
3409                                 } else {
3410                                         $cast = $cast2;
3411                                 }
3412                                 WARN("MINMAX",
3413                                      "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
3414                         }
3415                 }
3416
3417 # check usleep_range arguments
3418                 if ($^V && $^V ge 5.10.0 &&
3419                     defined $stat &&
3420                     $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
3421                         my $min = $1;
3422                         my $max = $7;
3423                         if ($min eq $max) {
3424                                 WARN("USLEEP_RANGE",
3425                                      "usleep_range should not use min == max args; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
3426                         } elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
3427                                  $min > $max) {
3428                                 WARN("USLEEP_RANGE",
3429                                      "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
3430                         }
3431                 }
3432
3433 # check for new externs in .c files.
3434                 if ($realfile =~ /\.c$/ && defined $stat &&
3435                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
3436                 {
3437                         my $function_name = $1;
3438                         my $paren_space = $2;
3439
3440                         my $s = $stat;
3441                         if (defined $cond) {
3442                                 substr($s, 0, length($cond), '');
3443                         }
3444                         if ($s =~ /^\s*;/ &&
3445                             $function_name ne 'uninitialized_var')
3446                         {
3447                                 WARN("AVOID_EXTERNS",
3448                                      "externs should be avoided in .c files\n" .  $herecurr);
3449                         }
3450
3451                         if ($paren_space =~ /\n/) {
3452                                 WARN("FUNCTION_ARGUMENTS",
3453                                      "arguments for function declarations should follow identifier\n" . $herecurr);
3454                         }
3455
3456                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
3457                     $stat =~ /^.\s*extern\s+/)
3458                 {
3459                         WARN("AVOID_EXTERNS",
3460                              "externs should be avoided in .c files\n" .  $herecurr);
3461                 }
3462
3463 # checks for new __setup's
3464                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
3465                         my $name = $1;
3466
3467                         if (!grep(/$name/, @setup_docs)) {
3468                                 CHK("UNDOCUMENTED_SETUP",
3469                                     "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
3470                         }
3471                 }
3472
3473 # check for pointless casting of kmalloc return
3474                 if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
3475                         WARN("UNNECESSARY_CASTS",
3476                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
3477                 }
3478
3479 # check for alloc argument mismatch
3480                 if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
3481                         WARN("ALLOC_ARRAY_ARGS",
3482                              "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
3483                 }
3484
3485 # check for multiple semicolons
3486                 if ($line =~ /;\s*;\s*$/) {
3487                         WARN("ONE_SEMICOLON",
3488                              "Statements terminations use 1 semicolon\n" . $herecurr);
3489                 }
3490
3491 # check for switch/default statements without a break;
3492                 if ($^V && $^V ge 5.10.0 &&
3493                     defined $stat &&
3494                     $stat =~ /^\+[$;\s]*(?:case[$;\s]+\w+[$;\s]*:[$;\s]*|)*[$;\s]*\bdefault[$;\s]*:[$;\s]*;/g) {
3495                         my $ctx = '';
3496                         my $herectx = $here . "\n";
3497                         my $cnt = statement_rawlines($stat);
3498                         for (my $n = 0; $n < $cnt; $n++) {
3499                                 $herectx .= raw_line($linenr, $n) . "\n";
3500                         }
3501                         WARN("DEFAULT_NO_BREAK",
3502                              "switch default: should use break\n" . $herectx);
3503                 }
3504
3505 # check for gcc specific __FUNCTION__
3506                 if ($line =~ /__FUNCTION__/) {
3507                         WARN("USE_FUNC",
3508                              "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
3509                 }
3510
3511 # check for use of yield()
3512                 if ($line =~ /\byield\s*\(\s*\)/) {
3513                         WARN("YIELD",
3514                              "Using yield() is generally wrong. See yield() kernel-doc (sched/core.c)\n"  . $herecurr);
3515                 }
3516
3517 # check for semaphores initialized locked
3518                 if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
3519                         WARN("CONSIDER_COMPLETION",
3520                              "consider using a completion\n" . $herecurr);
3521                 }
3522
3523 # recommend kstrto* over simple_strto* and strict_strto*
3524                 if ($line =~ /\b((simple|strict)_(strto(l|ll|ul|ull)))\s*\(/) {
3525                         WARN("CONSIDER_KSTRTO",
3526                              "$1 is obsolete, use k$3 instead\n" . $herecurr);
3527                 }
3528
3529 # check for __initcall(), use device_initcall() explicitly please
3530                 if ($line =~ /^.\s*__initcall\s*\(/) {
3531                         WARN("USE_DEVICE_INITCALL",
3532                              "please use device_initcall() instead of __initcall()\n" . $herecurr);
3533                 }
3534
3535 # check for various ops structs, ensure they are const.
3536                 my $struct_ops = qr{acpi_dock_ops|
3537                                 address_space_operations|
3538                                 backlight_ops|
3539                                 block_device_operations|
3540                                 dentry_operations|
3541                                 dev_pm_ops|
3542                                 dma_map_ops|
3543                                 extent_io_ops|
3544                                 file_lock_operations|
3545                                 file_operations|
3546                                 hv_ops|
3547                                 ide_dma_ops|
3548                                 intel_dvo_dev_ops|
3549                                 item_operations|
3550                                 iwl_ops|
3551                                 kgdb_arch|
3552                                 kgdb_io|
3553                                 kset_uevent_ops|
3554                                 lock_manager_operations|
3555                                 microcode_ops|
3556                                 mtrr_ops|
3557                                 neigh_ops|
3558                                 nlmsvc_binding|
3559                                 pci_raw_ops|
3560                                 pipe_buf_operations|
3561                                 platform_hibernation_ops|
3562                                 platform_suspend_ops|
3563                                 proto_ops|
3564                                 rpc_pipe_ops|
3565                                 seq_operations|
3566                                 snd_ac97_build_ops|
3567                                 soc_pcmcia_socket_ops|
3568                                 stacktrace_ops|
3569                                 sysfs_ops|
3570                                 tty_operations|
3571                                 usb_mon_operations|
3572                                 wd_ops}x;
3573                 if ($line !~ /\bconst\b/ &&
3574                     $line =~ /\bstruct\s+($struct_ops)\b/) {
3575                         WARN("CONST_STRUCT",
3576                              "struct $1 should normally be const\n" .
3577                                 $herecurr);
3578                 }
3579
3580 # use of NR_CPUS is usually wrong
3581 # ignore definitions of NR_CPUS and usage to define arrays as likely right
3582                 if ($line =~ /\bNR_CPUS\b/ &&
3583                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
3584                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
3585                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
3586                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
3587                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
3588                 {
3589                         WARN("NR_CPUS",
3590                              "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
3591                 }
3592
3593 # check for %L{u,d,i} in strings
3594                 my $string;
3595                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
3596                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
3597                         $string =~ s/%%/__/g;
3598                         if ($string =~ /(?<!%)%L[udi]/) {
3599                                 WARN("PRINTF_L",
3600                                      "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
3601                                 last;
3602                         }
3603                 }
3604
3605 # whine mightly about in_atomic
3606                 if ($line =~ /\bin_atomic\s*\(/) {
3607                         if ($realfile =~ m@^drivers/@) {
3608                                 ERROR("IN_ATOMIC",
3609                                       "do not use in_atomic in drivers\n" . $herecurr);
3610                         } elsif ($realfile !~ m@^kernel/@) {
3611                                 WARN("IN_ATOMIC",
3612                                      "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
3613                         }
3614                 }
3615
3616 # check for lockdep_set_novalidate_class
3617                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
3618                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
3619                         if ($realfile !~ m@^kernel/lockdep@ &&
3620                             $realfile !~ m@^include/linux/lockdep@ &&
3621                             $realfile !~ m@^drivers/base/core@) {
3622                                 ERROR("LOCKDEP",
3623                                       "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
3624                         }
3625                 }
3626
3627                 if ($line =~ /debugfs_create_file.*S_IWUGO/ ||
3628                     $line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
3629                         WARN("EXPORTED_WORLD_WRITABLE",
3630                              "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
3631                 }
3632         }
3633
3634         # If we have no input at all, then there is nothing to report on
3635         # so just keep quiet.
3636         if ($#rawlines == -1) {
3637                 exit(0);
3638         }
3639
3640         # In mailback mode only produce a report in the negative, for
3641         # things that appear to be patches.
3642         if ($mailback && ($clean == 1 || !$is_patch)) {
3643                 exit(0);
3644         }
3645
3646         # This is not a patch, and we are are in 'no-patch' mode so
3647         # just keep quiet.
3648         if (!$chk_patch && !$is_patch) {
3649                 exit(0);
3650         }
3651
3652         if (!$is_patch) {
3653                 ERROR("NOT_UNIFIED_DIFF",
3654                       "Does not appear to be a unified-diff format patch\n");
3655         }
3656         if ($is_patch && $chk_signoff && $signoff == 0) {
3657                 ERROR("MISSING_SIGN_OFF",
3658                       "Missing Signed-off-by: line(s)\n");
3659         }
3660
3661         print report_dump();
3662         if ($summary && !($clean == 1 && $quiet == 1)) {
3663                 print "$filename " if ($summary_file);
3664                 print "total: $cnt_error errors, $cnt_warn warnings, " .
3665                         (($check)? "$cnt_chk checks, " : "") .
3666                         "$cnt_lines lines checked\n";
3667                 print "\n" if ($quiet == 0);
3668         }
3669
3670         if ($quiet == 0) {
3671
3672                 if ($^V lt 5.10.0) {
3673                         print("NOTE: perl $^V is not modern enough to detect all possible issues.\n");
3674                         print("An upgrade to at least perl v5.10.0 is suggested.\n\n");
3675                 }
3676
3677                 # If there were whitespace errors which cleanpatch can fix
3678                 # then suggest that.
3679                 if ($rpt_cleaners) {
3680                         print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
3681                         print "      scripts/cleanfile\n\n";
3682                         $rpt_cleaners = 0;
3683                 }
3684         }
3685
3686         if ($quiet == 0 && keys %ignore_type) {
3687             print "NOTE: Ignored message types:";
3688             foreach my $ignore (sort keys %ignore_type) {
3689                 print " $ignore";
3690             }
3691             print "\n\n";
3692         }
3693
3694         if ($clean == 1 && $quiet == 0) {
3695                 print "$vname has no obvious style problems and is ready for submission.\n"
3696         }
3697         if ($clean == 0 && $quiet == 0) {
3698                 print << "EOM";
3699 $vname has style problems, please review.
3700
3701 If any of these errors are false positives, please report
3702 them to the maintainer, see CHECKPATCH in MAINTAINERS.
3703 EOM
3704         }
3705
3706         return $clean;
3707 }