[PATCH v4 2/2] checkpatch: add Kconfig 'default n' test

[Yingjoe Chen]

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.c...@mediatek.com>
---
 scripts/checkpatch.pl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 19b270b..b3f1fda 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2689,6 +2689,13 @@ sub process {
                             "Use of boolean is deprecated, please use bool 
instead.\n" . $herecurr);
                }
 
+# discourage the use of default n
+               if ($realfile =~ /Kconfig/ &&
+                   $line =~ /^\+\s*default\s*n$/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