checkpatch: special audit for revert commit line

Currently checkpatch.pl does not recognize git's default commit revert
message and will complain about the hash format.  Add special audit for
revert commit message line to fix it.

Link: http://lkml.kernel.org/r/20170411191532.74381-1-wvw@google.com
Signed-off-by: Wei Wang <wvw@google.com>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3e2d9b0fe5a5dad14160fa7f76ef8755e746a14d..b1befa2cec26fed7c6abc3fd8f34f96af79418aa 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2539,6 +2539,7 @@ sub process {
 # Check for git id commit length and improperly formed commit descriptions
                if ($in_commit_log && !$commit_log_possible_stack_dump &&
                    $line !~ /^\s*(?:Link|Patchwork|http|https|BugLink):/i &&
+                   $line !~ /^This reverts commit [0-9a-f]{7,40}/ &&
                    ($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
                     ($line =~ /(?:\s|^)[0-9a-f]{12,40}(?:[\s"'\(\[]|$)/i &&
                      $line !~ /[\<\[][0-9a-f]{12,40}[\>\]]/i &&