Tejun Heo 49d1dc4b81 cgroup: implement static_key based cgroup_subsys_enabled() and cgroup_subsys_on_dfl()
Whether a subsys is enabled and attached to the default hierarchy
seldom changes and may be tested in the hot paths.  This patch
implements static_key based cgroup_subsys_enabled() and
cgroup_subsys_on_dfl() tests.

The following patches will update the users and remove duplicate
mechanisms.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
2015-09-18 11:56:28 -04:00
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