linux-kernel - [PATCH] checkpatch: Check for duplicate signatures

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Date:	Wed, 24 Jul 2013 12:24:24 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andy Whitcroft <apw@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Won Kang <wonkang@...semi.com>
Subject: [PATCH] checkpatch: Check for duplicate signatures

Emit a warning when a signature is used more than once.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 5cfef19..6918517 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1532,6 +1532,7 @@ sub process {
 	my %suppress_export;
 	my $suppress_statement = 0;
 
+	my %signatures = ();
 
 	# Pre-scan the patch sanitizing the lines.
 	# Pre-scan the patch looking for any __setup documentation.
@@ -1781,6 +1782,17 @@ sub process {
 					     "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
 				}
 			}
+
+# Check for duplicate signatures
+			my $sig_nospace = $line;
+			$sig_nospace =~ s/\s//g;
+			$sig_nospace = lc($sig_nospace);
+			if (defined $signatures{$sig_nospace}) {
+				WARN("BAD_SIGN_OFF",
+				     "Duplicate signature\n" . $herecurr);
+			} else {
+				$signatures{$sig_nospace} = 1;
+			}
 		}
 
 # Check for wrappage within a valid hunk of the file


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