tree 34c5868d819fad1b831e72ca600e655a7b9d8872
parent 7553e8f2d5161a2b7a9b7a9f37be1b77e735552f
author David Rientjes <rientjes@google.com> 1308791584 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1308802008 -0700

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>