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memcg: remove redundant code in mem_cgroup_force_empty_write() 

vfs guarantees the cgroup won't be destroyed, so it's redundant to get a
css reference.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zefan 2013-09-12 15:13:19 -07:00 committed by Linus Torvalds
parent d5d04bb48f
commit c33bd8354f
1 changed files with 1 additions and 7 deletions
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8
mm/memcontrol.c
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@ -4990,18 +4990,12 @@ static int mem_cgroup_force_empty_write(struct cgroup_subsys_state *css,
unsigned int event)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
int ret;
if (mem_cgroup_is_root(memcg))
return -EINVAL;
css_get(&memcg->css);
ret = mem_cgroup_force_empty(memcg);
css_put(&memcg->css);
return ret;
return mem_cgroup_force_empty(memcg);
}
static u64 mem_cgroup_hierarchy_read(struct cgroup_subsys_state *css,
struct cftype *cft)
{