From: Li Zefan <lizefan@huawei.com>
Date: Sun, 9 Jun 2013 09:15:08 +0000 (+0800)
Subject: cpuset: record old_mems_allowed in struct cpuset
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~43^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=33ad801dfb5c8b1127c72fdb745ce8c630150f3f;p=pandora-kernel.git

cpuset: record old_mems_allowed in struct cpuset

When we update a cpuset's mems_allowed and thus update tasks'
mems_allowed, it's required to pass the old mems_allowed and new
mems_allowed to cpuset_migrate_mm().

Currently we save old mems_allowed in a temp local variable before
changing cpuset->mems_allowed. This patch changes it by saving
old mems_allowed in cpuset->old_mems_allowed.

This currently won't change any behavior, but it will later allow
us to keep tasks in empty cpusets.

v3: restored "cpuset_attach_nodemask_to = cs->mems_allowed"

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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