tree 6ab5c1866671d43451aa2a03a0d3e68fada2f291
parent 3f79851831a135c5cebbcaa8cddb07d02870b069
author Tejun Heo <tj@kernel.org> 1376007082 -0400
committer Tejun Heo <tj@kernel.org> 1376007082 -0400

cgroup: add subsystem pointer to cgroup_subsys_state

Currently, given a cgroup_subsys_state, there's no way to find out
which subsystem the css is for, which we'll need to convert the cgroup
controller API to primarily use @css instead of @cgroup.  This patch
adds cgroup_subsys_state->ss which points to the subsystem the @css
belongs to.

While at it, remove the comment about accessing @css->cgroup to
determine the hierarchy.  cgroup core will provide API to traverse
hierarchy of css'es and we don't want subsystems to directly walk
cgroup hierarchies anymore.

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