linux-kernel - [PATCH] checkpatch: fix a number of COMPLEX

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Message-Id: <1446154613-8249-1-git-send-email-vz@mleia.com>
Date:	Thu, 29 Oct 2015 23:36:53 +0200
From:	Vladimir Zapolskiy <vz@...ia.com>
To:	Joe Perches <joe@...ches.com>, Andy Whitcroft <apw@...onical.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] checkpatch: fix a number of COMPLEX_MACRO false positives

A simple search over the kernel souce displays a number of correctly
defined multiline macro, which generally are used as an array element
initializer:

% find ../linux -type f | xargs grep -B1 -H '^[:space]*\[.*\\$'

However checkpatch.pl unexpectedly complains about all these macro
definitions:

% ./scripts/checkpatch.pl --types COMPLEX_MACRO -f include/linux/perf/arm_pmu.h

ERROR: Macros with complex values should be enclosed in parentheses
+#define PERF_MAP_ALL_UNSUPPORTED					\
+	 [0 ... PERF_COUNT_HW_MAX - 1] = HW_OP_UNSUPPORTED

The change intends to fix this type of false positives by flattening
only array members and skipping array element designators.

Signed-off-by: Vladimir Zapolskiy <vz@...ia.com>
---
 scripts/checkpatch.pl | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f2a1131..3882893 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4526,7 +4526,7 @@ sub process {
 			# Flatten any parentheses and braces
 			while ($dstat =~ s/\([^\(\)]*\)/1/ ||
 			       $dstat =~ s/\{[^\{\}]*\}/1/ ||
-			       $dstat =~ s/\[[^\[\]]*\]/1/)
+			       $dstat =~ s/.\[[^\[\]]*\]/1/)
 			{
 			}
 
@@ -4546,7 +4546,8 @@ sub process {
 				union|
 				struct|
 				\.$Ident\s*=\s*|
-				^\"|\"$
+				^\"|\"$|
+				^\[
 			}x;
 			#print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
 			if ($dstat ne '' &&
-- 
2.1.4

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