[37/91] checkpatch: exclude four preprocessor sub-expressions from MACRO_ARG_REUSE

Commit Message

Andrew Morton May 7, 2021, 1:03 a.m. UTC

From: Vincent Mailhol <[e-mail]>
Subject: 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.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Vincent Mailhol <[e-mail]>
Acked-by: Joe Perches <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 scripts/checkpatch.pl |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

--- a/scripts/checkpatch.pl~checkpatch-exclude-four-preprocessor-sub-expressions-from-macro_arg_reuse
+++ a/scripts/checkpatch.pl
@@ -5829,7 +5829,7 @@  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;