From: Li Zefan <lizefan@huawei.com>
Date: Sun, 9 Jun 2013 09:14:22 +0000 (+0800)
Subject: cpuset: let hotplug propagation work wait for task attaching
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~43^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e44193d39e8d4d1de5d996fcd37ed75e5c704f10;p=pandora-kernel.git

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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