linux-kernel - [PATCH v2 1/3] checkpatch: add Kconfig 'default n' test

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Message-ID: <1461335527-19270-1-git-send-email-yingjoe.chen@mediatek.com>
Date:	Fri, 22 Apr 2016 22:32:05 +0800
From:	Yingjoe Chen <yingjoe.chen@...iatek.com>
To:	Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>
CC:	<linux-kernel@...r.kernel.org>, Andi Kleen <ak@...ux.intel.com>,
	Paul Bolle <pebolle@...cali.nl>, <srv_heupstream@...iatek.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>
Subject: [PATCH v2 1/3] checkpatch: add Kconfig 'default n' test

If a Kconfig config option doesn't specify 'default', the default
will be n. Adding 'default n' is unnecessary.

Add a test to warn about this.

Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
---
Change in v2:
- Change according to Joe Perches' suggestion

 scripts/checkpatch.pl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d574d13..3cb7c2d 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2600,6 +2600,13 @@ sub process {
 			     "Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
 		}
 
+# discourage the use of default n
+		if ($realfile =~ /Kconfig/ &&
+		    $line =~ /^\+\s*default\s*n\s*(#.*|$)/i) {
+			WARN("CONFIG_DEFAULT_N",
+			     "Use of default n is unnecessary, default is n when omitted.\n" . $herecurr);
+		}
+
 		if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
 		    ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
 			my $flag = $1;
-- 
1.9.1