linux-kernel - [PATCH] checkpatch: Do not check git commit description style when backport the upstream commit

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Date:   Wed, 25 Nov 2020 11:29:14 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>
Cc:     linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>
Subject: [PATCH] checkpatch: Do not check git commit description style when backport the upstream commit

When backport the upstream commit to the internal LTS kernel version,
we usually use the following description [1] [2]:

[ Upstream commit cc6528bc9a0c901c83b8220a2e2617f3354d6dd9 ]
or
commit c51f8f88d705e06bd696d7510aff22b33eb8e638 upstream.

We use checkpatch.pl before auto build and there exists auto build
failure due to the following checkpatch error:

ERROR: Please use git commit description style 'commit <12+ chars of sha1> ("<title line>")' - ie: 'commit cc6528bc9a0c ("r8169: fix potential skb double free in an error path")'
#6:
[ Upstream commit cc6528bc9a0c901c83b8220a2e2617f3354d6dd9 ]
or
ERROR: Please use git commit description style 'commit <12+ chars of sha1> ("<title line>")' - ie: 'commit c51f8f88d705 ("random32: make prandom_u32() output unpredictable")'
#6:
commit c51f8f88d705e06bd696d7510aff22b33eb8e638 upstream.

We can use "--ignore GIT_COMMIT_ID" to avoid this checkpatch
error, but I think it is better to modify the check rule of
checkpatch. When there exists "Upstream" or "upstream" in the
commit line, it seems no need to do more check.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=bc571404829755e4a9504cc5fbc636fea80b2d83
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=81d7c56d6fab5ccbf522c47a655cd427808679f2

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 scripts/checkpatch.pl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index fab38b4..f5bbfdd 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2889,7 +2889,8 @@ sub process {
 		    ($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
 		     ($line =~ /(?:\s|^)[0-9a-f]{12,40}(?:[\s"'\(\[]|$)/i &&
 		      $line !~ /[\<\[][0-9a-f]{12,40}[\>\]]/i &&
-		      $line !~ /\bfixes:\s*[0-9a-f]{12,40}/i))) {
+		      $line !~ /\bfixes:\s*[0-9a-f]{12,40}/i)) &&
+		    $line !~ /^\s*Upstream|upstream/i) {
 			my $init_char = "c";
 			my $orig_commit = "";
 			my $short = 1;
-- 
2.1.0