From: Tejun Heo <tj@kernel.org>
Date: Tue, 13 May 2014 16:19:22 +0000 (-0400)
Subject: cgroup: move cgroup->kn->priv clearing to cgroup_rmdir()
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~81^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cfc79d5bec04cdf26cd207d3e73d8bd59fd780a8;p=pandora-kernel.git

cgroup: move cgroup->kn->priv clearing to cgroup_rmdir()

The ->priv field of a cgroup directory kernfs_node points back to the
cgroup.  This field is RCU cleared in cgroup_destroy_locked() for
non-kernfs accesses from css_tryget_from_dir() and
cgroupstats_build().

As these are only applicable to cgroups which finished creation
successfully and fully initialized cgroups are always removed by
cgroup_rmdir(), this can be safely moved to the end of cgroup_rmdir().

This will help simplifying cgroup locking and shouldn't introduce any
behavior difference.

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