From: David Rientjes <rientjes@google.com>
Date: Thu, 23 Jun 2011 01:13:04 +0000 (-0700)
Subject: mm, hotplug: protect zonelist building with zonelists_mutex
X-Git-Tag: v3.0-rc5~47
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f957db4fcdd8f03e186aa8f041f4049e76ab741c;p=pandora-kernel.git

mm, hotplug: protect zonelist building with zonelists_mutex

Commit 959ecc48fc75 ("mm/memory_hotplug.c: fix building of node hotplug
zonelist") does not protect the build_all_zonelists() call with
zonelists_mutex as needed.  This can lead to races in constructing
zonelist ordering if a concurrent build is underway.  Protecting this
with lock_memory_hotplug() is insufficient since zonelists can be
rebuild though sysfs as well.

Signed-off-by: David Rientjes <rientjes@google.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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