linux-kernel - Re: [PATCH 09/10] um: Properly check all process' threads for a live mm

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Date:	Sat, 24 Mar 2012 12:12:21 +0100
From:	Richard Weinberger <richard@....at>
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>,
	Paul Mundt <lethal@...ux-sh.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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 09/10] um: Properly check all process' threads for a live
 mm

Am 24.03.2012 11:31, schrieb Anton Vorontsov:
> kill_off_processes() might miss a valid process, this is because
> checking for process->mm is not enough. Process' main thread may
> exit or detach its mm via use_mm(), but other threads may still
> have a valid mm.
> 
> To catch this we use find_lock_task_mm(), which walks up all
> threads and returns an appropriate task (with task lock held).
> 
> Suggested-by: Oleg Nesterov <oleg@...hat.com>
> Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>

Acked-by: Richard Weinberger <richard@....at>

Thanks,
//richard


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