From: Anton Vorontsov <anton.vorontsov@linaro.org>
Date: Thu, 31 May 2012 23:26:26 +0000 (-0700)
Subject: um: properly check all process' threads for a live mm
X-Git-Tag: v3.5-rc1~21^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c922c51e6924298f8271d75732964f1ffdecaf2;p=pandora-kernel.git

um: properly check all process' threads for a live mm

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@redhat.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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