linux-kernel - [PATCH 4/5] checkpatch: check for if's with unnecessary parentheses

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Message-Id: <c338a811bcaab4c3b684cf50575722af8d286865.1388085015.git.joe@perches.com>
Date:	Thu, 26 Dec 2013 11:20:31 -0800
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Josh Triplett <josh@...htriplett.org>,
	Manfred Spraul <manfred@...orfullife.com>,
	Andy Whitcroft <apw@...onical.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] checkpatch: check for if's with unnecessary parentheses

If statements don't need multiple parentheses around tested
comparisons like "if ((foo == bar))".

An == comparison maybe a sign of an intended assignment,
so emit a slightly different message if so.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index db72b88..c12234e 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3322,6 +3322,20 @@ sub process {
 			}
 		}
 
+# if statements using unnecessary parentheses - ie: if ((foo == bar))
+		if ($^V && $^V ge 5.10.0 &&
+		    $line =~ /\bif\s*((?:\(\s*){2,})/) {
+			my $openparens = $1;
+			my $count = $openparens =~ tr@\(@\(@;
+			my $msg = "";
+			if ($line =~ /\bif\s*(?:\(\s*){$count,$count}$LvalOrFunc\s*($Compare)\s*$LvalOrFunc(?:\s*\)){$count,$count}/) {
+				my $comp = $4;	#Not $1 because of $LvalOrFunc
+				$msg = " - maybe == should be = ?" if ($comp eq "==");
+				WARN("UNNECESSARY_PARENTHESES",
+				     "Unnecessary parentheses$msg\n" . $herecurr);
+			}
+		}
+
 # Return of what appears to be an errno should normally be -'ve
 		if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
 			my $name = $1;
-- 
1.8.1.2.459.gbcd45b4.dirty

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