[PATCH] checkpatch: avoid default n

Miles Chen
2019-07-03T08:30:43Z

This change reports a warning when "default n" is used.

I have seen several "remove default n" patches, so I think
it might be helpful to add this test in checkpatch.

tested:
WARNING: 'default n' is the default value, no need to write it explicitly.
+ default n

Signed-off-by: Miles Chen <miles.chen@mediatek.com>
---
scripts/checkpatch.pl | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 342c7c781ba5..6531b5757c6b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3005,6 +3005,13 @@ sub process {
"Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
}

+# avoid redundant 'default n'
+ if ($realfile =~ /Kconfig/ &&
+ $line =~ /^\+\s*\bdefault n\b/) {
+ WARN("AVOID_DEFAULT_N",
+ "'default n' is the default value, no need to write it explicitly.\n" . $herecurr);
+ }
+
if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
my $flag = $1;
--
2.18.0