[PATCH v2] checkpatch: Tolerate upstream commit references

[Petr Machata <petrm@nvidia.com>]

Two forms of upstream commit references are used (and documented) for
stable kernels:

- [ Upstream commit <sha1> ]
- commit <sha1> upstream.

Extend checkpatch so that it doesn't cite these. This reduces noise that
downstream maintainers experience when checkpatching patches that may
contain commit references of this sort.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Andy Roulin <aroulin@nvidia.com>
---

Notes:
    v2:
    - No changes, just a ping.

 scripts/checkpatch.pl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 664f7b7a622c..bd4405b59103 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3351,6 +3351,8 @@ sub process {
 		if ($perl_version_ok &&
 		    $in_commit_log && !$commit_log_possible_stack_dump &&
 		    $line !~ /^\s*(?:Link|Patchwork|http|https|BugLink|base-commit):/i &&
+		    $line !~ /^\s*\[ Upstream commit [0-9a-f]{40} ]/ &&
+		    $line !~ /^\s*commit [0-9a-f]{40}\s*upstream\./ &&
 		    $line !~ /^This reverts commit [0-9a-f]{7,40}/ &&
 		    (($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
 		      ($line =~ /\bcommit\s*$/i && defined($rawlines[$linenr]) && $rawlines[$linenr] =~ /^\s*[0-9a-f]{5,}\b/i)) ||
-- 
2.49.0