tree 5e1a967eac89becbb0e480dc08906be20d3d3c2d
parent 04a4ec32571e88c614b229824afec376d24cc035
author Tejun Heo <tj@kernel.org> 1352481150 -0800
committer Tejun Heo <tj@kernel.org> 1352481150 -0800

cgroup_freezer: make freezer->state mask of flags

freezer->state was an enum value - one of THAWED, FREEZING and FROZEN.
As the scheduled full hierarchy support requires more than one
freezing condition, switch it to mask of flags.  If FREEZING is not
set, it's thawed.  FREEZING is set if freezing or frozen.  If frozen,
both FREEZING and FROZEN are set.  Now that tasks can be attached to
an already frozen cgroup, this also makes freezing condition checks
more natural.

This patch doesn't introduce any behavior change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>