From 070b57fcacc9dfc23a180290079078373fb697e1 Mon Sep 17 00:00:00 2001
From: Li Zefan <lizefan@huawei.com>
Date: Sun, 9 Jun 2013 17:15:22 +0800
Subject: [PATCH] cpuset: introduce effective_{cpumask|nodemask}_cpuset()

effective_cpumask_cpuset() returns an ancestor cpuset which has
non-empty cpumask.

If a cpuset is empty and the tasks in it need to update their
cpus_allowed, they take on the ancestor cpuset's cpumask.

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

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