tree be42d0a743175431ee8dc6e5e43df99395163f98
parent 05ebb6e60f044a9cef2549b6204559276500f363
author Tejun Heo <tj@kernel.org> 1405436710 -0400
committer Tejun Heo <tj@kernel.org> 1405436710 -0400

cgroup: initialize cgrp_dfl_root_inhibit_ss_mask from !->dfl_files test

cgrp_dfl_root_inhibit_ss_mask determines which subsystems are not
supported on the default hierarchy and is currently initialized
statically and just includes the debug subsystem.  Now that there's
cgroup_subsys->dfl_files, we can easily tell which subsystems support
the default hierarchy or not.

Let's initialize cgrp_dfl_root_inhibit_ss_mask by testing whether
cgroup_subsys->dfl_files is NULL.  After all, subsystems with NULL
->dfl_files aren't useable on the default hierarchy anyway.

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