checkpatch: macros: fix statement counting block end detection

We are incorrectly counting the lines in a block while accumulating
the trailing lines in a macro statement, leading to false positives.
Fix end of block handling and general counting for negative context lines.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index b2b0648..add8686 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -470,7 +470,9 @@ sub ctx_statement_block {
                }
                $off++;
        }
+       # We are truly at the end, so shuffle to the next line.
        if ($off == $len) {
+               $loff = $len + 1;
                $line++;
                $remain--;
        }
@@ -1793,30 +1795,26 @@ sub process {
                                $lines[$ln - 1] =~ /^(?:-|..*\\$)/)
                        {
                                $ctx .= $rawlines[$ln - 1] . "\n";
+                               $cnt-- if ($lines[$ln - 1] !~ /^-/);
                                $ln++;
-                               $cnt--;
                        }
                        $ctx .= $rawlines[$ln - 1];
 
                        ($dstat, $dcond, $ln, $cnt, $off) =
                                ctx_statement_block($linenr, $ln - $linenr + 1, 0);
                        #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
-                       #print "LINE<$lines[$ln]> len<" . length($lines[$ln]) . "\n";
+                       #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
 
                        # Extract the remainder of the define (if any) and
                        # rip off surrounding spaces, and trailing \'s.
                        $rest = '';
-                       if (defined $lines[$ln - 1] &&
-                           $off > length($lines[$ln - 1]))
-                       {
-                               $ln++;
-                               $cnt--;
-                               $off = 0;
-                       }
-                       while ($cnt > 0) {
-                               $rest .= substr($lines[$ln - 1], $off) . "\n";
+                       while ($off != 0 || ($cnt > 0 && $rest =~ /(?:^|\\)\s*$/)) {
+                               #print "ADDING $off <" . substr($lines[$ln - 1], $off) . ">\n";
+                               if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
+                                       $rest .= substr($lines[$ln - 1], $off) . "\n";
+                                       $cnt--;
+                               }
                                $ln++;
-                               $cnt--;
                                $off = 0;
                        }
                        $rest =~ s/\\\n.//g;
@@ -1847,6 +1845,7 @@ sub process {
                                DEFINE_PER_CPU|
                                __typeof__\(
                        }x;
+                       #print "REST<$rest>\n";
                        if ($rest ne '') {
                                if ($rest !~ /while\s*\(/ &&
                                    $dstat !~ /$exceptions/)