From: Andrew Morton <akpm@linux-foundation.org>
Date: Tue, 2 Dec 2014 23:59:28 +0000 (-0800)
Subject: mm/vmpressure.c: fix race in vmpressure_work_fn()
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~47^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91b57191cfd152c02ded0745250167d0263084f8;p=pandora-kernel.git

mm/vmpressure.c: fix race in vmpressure_work_fn()

In some android devices, there will be a "divide by zero" exception.
vmpr->scanned could be zero before spin_lock(&vmpr->sr_lock).

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=88051

[akpm@linux-foundation.org: neaten]
Reported-by: ji_ang <ji_ang@163.com>
Cc: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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