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

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Date:	Fri, 3 Feb 2012 19:35:40 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Joe Perches <joe@...ches.com>
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, Feb 3, 2012 at 7:21 PM, Joe Perches <joe@...ches.com> wrote:
>
> 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)

Fair enough.

And I have to admit that doing your grep with an additional -4 to see
some context does make a fairly strong argument for your patch.

The code in drivers/isdn/hisax/hfc_usb.c that triggers is absolutely
disgusting, and does crazy things due to the long lines.

As is some other code that grep shows.

In fact, I think that grep convinced me that you are right about this
particular pattern. Brr. Now I need to go dig my eyes out with a
spoon.

                    Linus

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