From d6a2fe134219adf94e6bd0c8f6e2a3163ff68c41 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Fri, 9 Nov 2012 09:12:30 -0800
Subject: [PATCH] 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>
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