checkpatch: look for c99 comments in ctx_locate_comment

Some checks look for comments around a specific function like
read_barrier_depends.

Extend the check to support both c89 and c90 comment styles.

	c89 /* comment */
or
	c99 // comment

For c99 comments, only look a 3 single lines, the line being scanned,
the line above and the line below the line being scanned rather than
the patch diff context.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Will Deacon <will@kernel.org>
Link: http://lkml.kernel.org/r/65cb075435d2f385a53c77571b491b2b09faaf8e.camel@perches.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 10d75da049474d20b0d1fac5c95cc22dd9ed8597..880fe8639fb6621224c2d5919709f682455c86a9 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1676,8 +1676,16 @@ sub ctx_statement_level {
 sub ctx_locate_comment {
        my ($first_line, $end_line) = @_;
 
+       # If c99 comment on the current line, or the line before or after
+       my ($current_comment) = ($rawlines[$end_line - 1] =~ m@^\+.*(//.*$)@);
+       return $current_comment if (defined $current_comment);
+       ($current_comment) = ($rawlines[$end_line - 2] =~ m@^[\+ ].*(//.*$)@);
+       return $current_comment if (defined $current_comment);
+       ($current_comment) = ($rawlines[$end_line] =~ m@^[\+ ].*(//.*$)@);
+       return $current_comment if (defined $current_comment);
+
        # Catch a comment on the end of the line itself.
-       my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
+       ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
        return $current_comment if (defined $current_comment);
 
        # Look through the context and try and figure out if there is a