linux-kernel - Re: [PATCH] checkpatch: Warn on code with 6+ tab indentation

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Date:	Fri, 03 Feb 2012 19:21:37 -0800
From:	Joe Perches <joe@...ches.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andy Whitcroft <apw@...dowen.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	linux-kernel@...r.kernel.org,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
	Andrew Vagin <avagin@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Glauber Costa <glommer@...allels.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>, Valdis.Kletnieks@...edu
Subject: Re: [PATCH] checkpatch: Warn on code with 6+ tab indentation

On Fri, 2012-02-03 at 19:09 -0800, Linus Torvalds wrote:
> On Fri, Feb 3, 2012 at 5:33 PM, Joe Perches <joe@...ches.com> wrote:
> > You liked the same premise, but a worse
> > implementation, a couple years ago.
> > https://lkml.org/lkml/2009/12/18/289
> I have grown to dislike debatable parts of checkpatch over the years,
> which probably colors my reaction to things like this.
> I'd prefer for checkpatch to check things that are fairly black-and-white.
> >> Why? Because mindless checks like this would just lead to people
> >> making things worse and intermixing spaces there instead.
> > Can't happen.
> > They'll get a different warning about mixing tabs
> > and spaces or starting a line with spaces only.
> Ok,. fair enough. That makes it more likely to work.
> That said, I did a grep for six tabs, and we do seem to have quite a
> bit of code like that. 67 _thousand_ lines just in C files, if I did
> my grep right

I think that's a bad test.
It finds a _lot_ of line continuations.

The right test is _only_ for 6 or more tabs
followed by (if|for|while|do|else|switch)

$ grep -rP --include=*.[ch] "^\t{6,}(if|for|while|do|else|switch)" * | \
  wc -l
1509


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