From: Tejun Heo <tj@kernel.org>
Date: Fri, 16 May 2014 17:22:52 +0000 (-0400)
Subject: cgroup: implement css_tryget()
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~81^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6f4524d355a86769b65d5420a6ef47fb0bba9b72;p=pandora-kernel.git

cgroup: implement css_tryget()

Implement css_tryget() which tries to grab a cgroup_subsys_state's
reference as long as it already hasn't reached zero.  Combined with
the recent css iterator changes to include offline && !released csses
during traversal, this can be used to access csses regardless of its
online state.

v2: Take the new flag CSS_NO_REF into account.

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

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