tree 7dabac1a6fc0b947e77c8d6a03f9d28fa7f2d32e
parent c80cd92bb7b152912b8d4487c18d040e1b4266b0
author Mel Gorman <mgorman@suse.de> 1303767402 +0000
committer Laura Abbott <lauraa@codeaurora.org> 1341011209 -0700

mm: Serialize access to min_free_kbytes

There is a race between the min_free_kbytes sysctl, memory hotplug
and transparent hugepage support enablement.  Memory hotplug uses a
zonelists_mutex to avoid a race when building zonelists. Reuse it to
serialise watermark updates.

Change-Id: I31786592a8cc03e579ee01d99d7eba76e926263f
[a.p.zijlstra@chello.nl: Older patch fixed the race with spinlock]
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Tested-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>