netdev - Re: [PATCH 2/8] batman-adv: Disable CONFIG_BATMAN_ADV

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Date:   Fri, 25 May 2018 11:20:55 -0700
From:   Joe Perches <joe@...ches.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Sven Eckelmann <sven@...fation.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Simon Wunderlich <sw@...onwunderlich.de>, davem@...emloft.net,
        netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org
Subject: Re: [PATCH 2/8] batman-adv: Disable CONFIG_BATMAN_ADV_DEBUGFS by
 default

On Fri, 2018-05-25 at 14:13 +0300, Sergei Shtylyov wrote:
> On 5/25/2018 1:50 PM, Sven Eckelmann wrote:
> 
> > [...]
> > > > --- a/net/batman-adv/Kconfig
> > > > +++ b/net/batman-adv/Kconfig
> > > > @@ -94,13 +94,13 @@ config BATMAN_ADV_DEBUGFS
> > > > bool "batman-adv debugfs entries"
> > > > depends on BATMAN_ADV
> > > > depends on DEBUG_FS
> > > > -       default y
> > > > +       default n
> > > 
> > >      N is the default default. :-) You don't need this line.
> > 
> > Hm, looks like this would have to be changed in a lot of places (~782
> > according to `git grep 'default n$'|wc -l` in my slightly outdated linux-
> > next). Do you want to fix it everywhere?
> 
>     No, but we can at least not add the new ones...
> 
> > Might be good to get this integrated
> > in checkpatch.pl when this will become a new policy.
> 
>     Adding Joe Perches. Joe, can you add a check for "default n"?

OK.

This also improves the Kconfig boolean->bool test above
as it's broken for multiple section Kconfig files with
help texts.
---
 scripts/checkpatch.pl | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index baddac9379f0..1f980be4950b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2888,9 +2888,22 @@ sub process {
 
 # discourage the use of boolean for type definition attributes of Kconfig options
 		if ($realfile =~ /Kconfig/ &&
-		    $line =~ /^\+\s*\bboolean\b/) {
-			WARN("CONFIG_TYPE_BOOLEAN",
-			     "Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
+		    $rawline =~ /^\+\s*\bboolean\b/) {
+			if (WARN("CONFIG_TYPE_BOOLEAN",
+				 "Use of boolean is deprecated, please use bool instead.\n" . $herecurr) &&
+			    $fix) {
+				$fixed[$fixlinenr] =~ s/\bboolean\b/bool/;
+			}
+		}
+
+# discourage the use of 'default n' in Kconfig files as that's the default
+		if ($realfile =~ /Kconfig/ &&
+		    $rawline =~ /^\+\s*default\s+n\s*$/) {
+			if (WARN("CONFIG_DEFAULT_N",
+				 "Unnecessary Use of 'default n'\n" . $herecurr) &&
+			    $fix) {
+				fix_delete_line($fixlinenr, $rawline);
+			}
 		}
 
 		if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&