[PATCH] 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.

These are useful apart from stable kernel trees to other downstream
maintainers that wish to keep track of what came from where. But
checkpatch gives citations on patches annotated this way.

Extend checkpatch to tolerate the documented upstream references. This
reduces noise for downstream maintainers.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Andy Roulin <aroulin@nvidia.com>
---
 scripts/checkpatch.pl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 9eed3683ad76..a6c81b38e413 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3340,6 +3340,8 @@ 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)) ||
-- 
2.47.0