checkpatch: allow reporting C99 style comments

Presently C99 style comments are removed unconditionally before actual
patch validity check happens. This is a problem for some third party
projects which use but do not allow C99 style comments.

This patch adds yet another variable, named C99_COMMENT_TOLERANCE. If
it is included in the --ignore command line or config file options
list, C99 comments in the patch are reported as errors. Acked by
upstream maintainer (see

TEST=tried processing a patch with a C99 style comment, it passes the
     check just fine unless '--ignore C99_COMMENT_TOLERANCE' is
     present in .checkpatch.conf.

Change-Id: I5534b8e10be0aeec1e68dcb47ec80ec3f2b3fbdb
Signed-off-by: Vadim Bendebury <>
Reviewed-by: Douglas Anderson <>
Reviewed-by: Brian Norris <>
diff --git a/ b/
index 2d42eb9..0e66dae 100755
--- a/
+++ b/
@@ -58,7 +58,7 @@
 my $conststructsfile = "$D/const_structs.checkpatch";
 my $typedefsfile = "";
 my $color = "auto";
-my $allow_c99_comments = 1;
+my $allow_c99_comments = 1; # Can be overridden by --ignore C99_COMMENT_TOLERANCE
 sub help {
 	my ($exitcode) = @_;
@@ -973,6 +973,7 @@
 my $vname;
+$allow_c99_comments = !defined $ignore_type{"C99_COMMENT_TOLERANCE"};
 for my $filename (@ARGV) {
 	my $FILE;
 	if ($git) {