linux-kernel - Re: [PATCH 10/10] oom: Make find_lock_task

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Date:	Sat, 24 Mar 2012 13:52:54 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Russell King <linux@....linux.org.uk>,
	Mike Frysinger <vapier@...too.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Richard Weinberger <richard@....at>,
	Paul Mundt <lethal@...ux-sh.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	John Stultz <john.stultz@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net, linux-mm@...ck.org
Subject: Re: [PATCH 10/10] oom: Make find_lock_task_mm() sparse-aware

On Sat, 2012-03-24 at 14:31 +0400, Anton Vorontsov wrote:
> This is needed so that callers would not get 'context imbalance'
> warnings from the sparse tool.
> 
> As a side effect, this patch fixes the following sparse warnings:
> 
>   CHECK   mm/oom_kill.c
>   mm/oom_kill.c:201:28: warning: context imbalance in 'oom_badness' -
>   unexpected unlock
>   include/linux/rcupdate.h:249:30: warning: context imbalance in
>   'dump_tasks' - unexpected unlock
>   mm/oom_kill.c:453:9: warning: context imbalance in 'oom_kill_task' -
>   unexpected unlock
>   CHECK   mm/memcontrol.c
>   ...
>   mm/memcontrol.c:1130:17: warning: context imbalance in
>   'task_in_mem_cgroup' - unexpected unlock
> 
> p.s. I know Peter Zijlstra detest the __cond_lock() stuff, but untill
>      we have anything better in sparse, let's use it. This particular
>      patch helped me to detect one bug that I myself made during
>      task->mm fixup series. So, it is useful.

Yeah, so Nacked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Also, why didn't lockdep catch it?

Fix sparse already instead of smearing ugly all over.
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