From: Christoph Lameter <cl@linux.com>
Date: Wed, 23 Jan 2013 21:45:48 +0000 (+0000)
Subject: slub: tid must be retrieved from the percpu area of the current processor
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~15^2^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7cccd80b4397699902aced1ad3d692d384aaab77;p=pandora-kernel.git

slub: tid must be retrieved from the percpu area of the current processor

As Steven Rostedt has pointer out: rescheduling could occur on a
different processor after the determination of the per cpu pointer and
before the tid is retrieved. This could result in allocation from the
wrong node in slab_alloc().

The effect is much more severe in slab_free() where we could free to the
freelist of the wrong page.

The window for something like that occurring is pretty small but it is
possible.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
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