linux-kernel - [PATCH 2/2] checkpatch: Add --strict test for precedence challenged macro arguments

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Date:   Mon, 12 Sep 2016 22:43:03 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Whitcroft <apw@...onical.com>
Cc:     Julia Lawall <julia.lawall@...6.fr>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] checkpatch: Add --strict test for precedence challenged macro arguments

Add a test for macro arguents that have a non-comma leading or trailing
operator where the argument isn't parenthesized to avoid possible precedence
issues.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f135f8e..6e067e5 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4836,7 +4836,7 @@ sub process {
 # check if any macro arguments are reused (ignore '...' and 'type')
 			foreach my $arg (@def_args) {
 			        next if ($arg =~ /\.\.\./);
-			        next if ($arg =~ /^type$/);
+			        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;
@@ -4846,6 +4846,13 @@ sub process {
 					CHK("MACRO_ARG_REUSE",
 					    "Macro argument reuse '$arg' - possible side-effects?\n" . "$herectx");
 				}
++# check if any macro arguments may have other precedence issues
+				if ($define_stmt =~ m/($Operators)?\s*\b$arg\b\s*($Operators)?/m &&
+				    ((defined($1) && $1 ne ',') ||
+				     (defined($2) && $2 ne ','))) {
+					CHK("MACRO_ARG_PRECEDENCE",
+					    "Macro argument '$arg' may be better as '($arg)' to avoid precedence issues\n" . "$herectx");
+				}
 			}
 
 # check for macros with flow control, but without ## concatenation
-- 
2.10.0.rc2.1.g053435c