checkpatch: test for non-standard signatures

Warn on non-standard signature styles.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 630319acb826..3e04f80375de 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1600,13 +1600,17 @@ sub process {
 
 # Check signature styles
                 if (!$in_header_lines &&
-                    $line =~ /^(\s*)($signature_tags)(\s*)(.*)/) {
+                    $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
                         my $space_before = $1;
                         my $sign_off = $2;
                         my $space_after = $3;
                         my $email = $4;
                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
 
+                        if ($sign_off !~ /$signature_tags/) {
+                                WARN("BAD_SIGN_OFF",
+                                     "Non-standard signature: $sign_off\n" . $herecurr);
+                        }
                         if (defined $space_before && $space_before ne "") {
                                 WARN("BAD_SIGN_OFF",
                                      "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr);