mm, hotplug: protect zonelist building with zonelists_mutex
authorDavid Rientjes <rientjes@google.com>
Thu, 23 Jun 2011 01:13:04 +0000 (18:13 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 23 Jun 2011 04:06:48 +0000 (21:06 -0700)
commitf957db4fcdd8f03e186aa8f041f4049e76ab741c
tree34c5868d819fad1b831e72ca600e655a7b9d8872
parent7553e8f2d5161a2b7a9b7a9f37be1b77e735552f
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>
mm/memory_hotplug.c