cgroup: add subsystem pointer to cgroup_subsys_state
authorTejun Heo <tj@kernel.org>
Fri, 9 Aug 2013 00:11:22 +0000 (20:11 -0400)
committerTejun Heo <tj@kernel.org>
Fri, 9 Aug 2013 00:11:22 +0000 (20:11 -0400)
commit72c97e54e0f043d33b246d7460ae0a36c4b8c643
tree6ab5c1866671d43451aa2a03a0d3e68fada2f291
parent3f79851831a135c5cebbcaa8cddb07d02870b069
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>
include/linux/cgroup.h
kernel/cgroup.c