linux-kernel - [PATCH] checkpatch: remove false unbalanced braces warning

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Date:   Mon, 20 Feb 2017 13:16:44 +0100
From:   Sven Eckelmann <sven@...fation.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Andy Whitcroft <apw@...onical.com>, linux-kernel@...r.kernel.org,
        Sven Eckelmann <sven@...fation.org>
Subject: [PATCH] checkpatch: remove false unbalanced braces warning

Lines containing "} else {" should not be detected as unbalanced braces.
But the second check can be reduced to ".+else\s*{" and it therefore
never checked if the beginning of a line contains any other character
(like the relevant "}"). This check would also return true for
"} else {" and create warnings like

    CHECK: Unbalanced braces around else statement
    #391: FILE: ./net/batman-adv/tvlv.c:391:
    +   } else {

The check can be changed to check the whole line for the missing "}" to
avoid this false positive.

Fixes: 0d1532456c26 ("checkpatch: notice unbalanced else braces in a patch")
Signed-off-by: Sven Eckelmann <sven@...fation.org>
---
 scripts/checkpatch.pl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index ad5ea5c545b2..baa3c7be04ad 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5107,8 +5107,8 @@ sub process {
 		}
 
 # check for single line unbalanced braces
-		if ($sline =~ /.\s*\}\s*else\s*$/ ||
-		    $sline =~ /.\s*else\s*\{\s*$/) {
+		if ($sline =~ /^.\s*\}\s*else\s*$/ ||
+		    $sline =~ /^.\s*else\s*\{\s*$/) {
 			CHK("BRACES", "Unbalanced braces around else statement\n" . $herecurr);
 		}
 
-- 
2.11.0