From e44193d39e8d4d1de5d996fcd37ed75e5c704f10 Mon Sep 17 00:00:00 2001
From: Li Zefan <lizefan@huawei.com>
Date: Sun, 9 Jun 2013 17:14:22 +0800
Subject: [PATCH] cpuset: let hotplug propagation work wait for task attaching

Instead of triggering propagation work in cpuset_attach(), we make
hotplug propagation work wait until there's no task attaching in
progress.

IMO this is more robust. We won't see empty masks in cpuset_attach().

Also it's a preparation for removing propagation work. Without asynchronous
propagation we can't call move_tasks_in_empty_cpuset() in cpuset_attach(),
because otherwise we'll deadlock on cgroup_mutex.

tj: typo fixes.

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