linux-kernel - [PATCH] checkpatch: Look for c99 comments in ctx_locate

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Message-ID: <65cb075435d2f385a53c77571b491b2b09faaf8e.camel@perches.com>
Date:   Wed, 01 Apr 2020 19:20:30 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     paulmck@...nel.org, Marco Elver <elver@...gle.com>,
        dvyukov@...gle.com, glider@...gle.com, andreyknvl@...gle.com,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        apw@...onical.com, Will Deacon <will@...nel.org>
Subject: [PATCH] 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@...ches.com>
---
 scripts/checkpatch.pl | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d64c67..0f4db4 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1674,8 +1674,16 @@ 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