Merge branch 'for-3.15-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...

Pull to receive e37a06f10994 ("cgroup: fix the retry path of
cgroup_mount()") to avoid unnecessary conflicts with planned
cgroup_tree_mutex removal and also to be able to remove the temp fix
added by 36c38fb7144a ("blkcg: use trylock on blkcg_pol_mutex in
blkcg_reset_stats()") afterwards.

Signed-off-by: Tejun Heo <tj@kernel.org>