From: Tejun Heo <tj@kernel.org>
Date: Tue, 18 Jun 2013 18:14:22 +0000 (-0700)
Subject: cgroup: clean up cgroup_serial_nr_cursor
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~44^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=00356bd5f0f5e04183fb15805eb29e97c2fc20ac;p=pandora-kernel.git

cgroup: clean up cgroup_serial_nr_cursor

cgroup_serial_nr_cursor was created atomic64_t because I thought it
was never gonna used for anything other than assigning unique numbers
to cgroups and didn't want to worry about synchronization; however,
now we're using it as an event-stamp to distinguish cgroups created
before and after certain point which assumes that it's protected by
cgroup_mutex.

Let's make it clear by making it a u64.  Also, rename it to
cgroup_serial_nr_next and make it point to the next nr to allocate so
that where it's pointing to is clear and more conventional.

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