linux-kernel - [PATCH] checkpatch: Improve MACRO_ARG

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Message-Id: <60229d13399f9b6509db5a32e30d4c16951a60cd.1473836073.git.joe@perches.com>
Date:   Tue, 13 Sep 2016 23:57:49 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Whitcroft <apw@...onical.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] checkpatch: Improve MACRO_ARG_PRECEDENCE test

It is possible for a multiple line macro definition to have a false positive
report when an argument is used on a line after a continuation \.

This line might have a leading '+' as the initial character that could be
confused by checkpatch as an operator.

Avoid the leading character on multiple line macro definitions.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index ea1a7ad..0ef3d83 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4833,13 +4833,31 @@ sub process {
 				}
 
 			}
+
+			# Make $define_stmt single line, comment-free, etc
+			my @stmt_array = split('\n', $define_stmt);
+			my $first = 1;
+			$define_stmt = "";
+			foreach my $l (@stmt_array) {
+				$l =~ s/\\$//;
+				if ($first) {
+					$define_stmt = $l;
+					$first = 0;
+				} elsif ($l =~ /^[\+ ]/) {
+					$define_stmt .= substr($l, 1);
+				}
+			}
+			$define_stmt =~ s/$;//g;
+			$define_stmt =~ s/\s+/ /g;
+			$define_stmt = trim($define_stmt);
+
 # check if any macro arguments are reused (ignore '...' and 'type')
 			foreach my $arg (@def_args) {
 			        next if ($arg =~ /\.\.\./);
 			        next if ($arg =~ /^type$/i);
 				my $tmp = $define_stmt;
 				$tmp =~ s/\b(typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g;
-				$tmp =~ s/\#\s*$arg\b//g;
+				$tmp =~ s/\#+\s*$arg\b//g;
 				$tmp =~ s/\b$arg\s*\#\#//g;
 				my $use_cnt = $tmp =~ s/\b$arg\b//g;
 				if ($use_cnt > 1) {
-- 
2.10.0.rc2.1.g053435c