linux-kernel - [PATCH v1] checkpatch: exclude four preprocessor sub-expressions from MACRO_ARG

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Message-Id: <20210306044813.68510-1-mailhol.vincent@wanadoo.fr>
Date:   Sat,  6 Mar 2021 13:48:13 +0900
From:   Vincent Mailhol <mailhol.vincent@...adoo.fr>
To:     Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>,
        linux-kernel@...r.kernel.org
Cc:     Vincent Mailhol <mailhol.vincent@...adoo.fr>
Subject: [PATCH v1] checkpatch: exclude four preprocessor sub-expressions from MACRO_ARG_REUSE

__must_be_array, offsetof, sizeof_field and __stringify are all
preprocessor macros and do not evaluate their arguments. As such, it
is safe not to warn when arguments are being reused in those four
sub-expressions.

Exclude those so that they can pass checkpatch.

Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
---
 scripts/checkpatch.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index df8b23dc1eb0..25ee4fd5b118 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5736,7 +5736,7 @@ sub process {
 			        next if ($arg =~ /\.\.\./);
 			        next if ($arg =~ /^type$/i);
 				my $tmp_stmt = $define_stmt;
-				$tmp_stmt =~ s/\b(sizeof|typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g;
+				$tmp_stmt =~ s/\b(__must_be_array|offsetof|sizeof|sizeof_field|__stringify|typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g;
 				$tmp_stmt =~ s/\#+\s*$arg\b//g;
 				$tmp_stmt =~ s/\b$arg\s*\#\#//g;
 				my $use_cnt = () = $tmp_stmt =~ /\b$arg\b/g;
-- 
2.26.2