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Commit c33bd835 authored by Li Zefan's avatar Li Zefan Committed by Linus Torvalds
Browse files

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: default avatarLi Zefan <lizefan@huawei.com>
Acked-by: default avatarMichal 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d5d04bb4

mm/memcontrol.c

+1 −7
Original line number Diff line number Diff line
@@ -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)

{