tree 34d5bcca6334c3ee76046010dd33b71c551dbe68
parent 95f12a9dc8b5a890c26ef5babe9382d49b5d48ab
author Tejun Heo <tj@kernel.org> 1456198095 -0500
committer Tejun Heo <tj@kernel.org> 1456198095 -0500

cgroup: make cgroup_calc_subtree_ss_mask() take @this_ss_mask

cgroup_calc_subtree_ss_mask() currently takes @cgrp and
@subtree_control.  @cgrp is used for two purposes - to decide whether
it's for default hierarchy and the mask of available subsystems.  The
former doesn't matter as the results are the same regardless.  The
latter can be specified directly through a subsystem mask.

This patch makes cgroup_calc_subtree_ss_mask() perform the same
calculations for both default and legacy hierarchies and take
@this_ss_mask for available subsystems.  @cgrp is no longer used and
dropped.  This is to allow using the function in contexts where
available controllers can't be decided from the cgroup.

This patch also drops cgroup_refresh_subtree_ss_mask().  It's a thin
wrapper which saves a bit of typing but the saving is pretty small and
planned changes will make its uses look inconsistent compared to
usages which don't update cgroups.

Signed-off-by: Tejun Heo <tj@kernel.org>