[PATCH] headers_check: enable check for CONFIG_ leakage

[Paul Bolle]

The check for leaked CONFIG_ symbols was disabled in v2.6.30, because it
generated too much noise. But a (rather simplistic) preprocessing of
comments suffices to silence the noise (ie, no false positives are
reported anymore).

So add some preprocessing of comments and enable check_config() again.

Signed-off-by: Paul Bolle <pebolle@xxxxxxxxxx>
---
 scripts/headers_check.pl | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/scripts/headers_check.pl b/scripts/headers_check.pl
index b6aec5e4365f..8e67017c1b67 100755
--- a/scripts/headers_check.pl
+++ b/scripts/headers_check.pl
@@ -36,13 +36,36 @@ foreach my $file (@files) {
 	open(my $fh, '<', $filename)
 		or die "$filename: $!\n";
 	$lineno = 0;
+	my $in_comment = 0;
+	my $swap_state = 0;
 	while ($line = <$fh>) {
 		$lineno++;
-		&check_include();
-		&check_asm_types();
-		&check_sizetypes();
-		&check_declarations();
-		# Dropped for now. Too much noise &check_config();
+
+		# strip inline comments
+		$line =~ s|/\*.*\*/||;
+
+		# try to handle multi line comments
+		if ($in_comment == 0 and $line =~ m|/\*|) {
+			$line =~ s|/\*.*$||;
+			# we still need to check (the first half of) this line
+			# so we set $in_comment after the checks
+			$swap_state = 1;
+		}
+		if ($in_comment == 1 and $line =~ m|\*/|) {
+			$line =~ s|^.*\*/||;
+			$in_comment = 0;
+		}
+		unless ($in_comment) {
+			check_include();
+			check_asm_types();
+			check_sizetypes();
+			check_declarations();
+			check_config();
+		}
+		if ($swap_state)  {
+			$in_comment = 1;
+			$swap_state = 0;
+		}
 	}
 	close $fh;
 }
-- 
2.17.2