From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 6 Nov 2013 17:47:57 +0000 (+0100)
Subject: sched/numa: Cure update_numa_stats() vs. hotplug
X-Git-Tag: v3.13-rc1~90^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5eca82a9ac2c961cfbd26a4b6f43e6e3747a71dd;p=pandora-kernel.git

sched/numa: Cure update_numa_stats() vs. hotplug

Because we're completely unserialized against hotplug its well
possible to try and generate numa stats for an offlined node.

Bail out early (and avoid a /0) in this case. The resulting stats are
all 0 which should result in an undesirable balance target -- not to
mention that actually trying to migrate to an offline CPU will fail.

Reported-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Link: http://lkml.kernel.org/n/tip-orja0qylcvyhxfsuebcyL5sI@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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