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