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>
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@ -4990,18 +4990,12 @@ static int mem_cgroup_force_empty_write(struct cgroup_subsys_state *css,
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unsigned int event)
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unsigned int event)
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{
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{
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struct mem_cgroup *memcg = mem_cgroup_from_css(css);
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struct mem_cgroup *memcg = mem_cgroup_from_css(css);
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int ret;
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if (mem_cgroup_is_root(memcg))
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if (mem_cgroup_is_root(memcg))
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return -EINVAL;
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return -EINVAL;
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css_get(&memcg->css);
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return mem_cgroup_force_empty(memcg);
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ret = mem_cgroup_force_empty(memcg);
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css_put(&memcg->css);
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return ret;
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}
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}
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static u64 mem_cgroup_hierarchy_read(struct cgroup_subsys_state *css,
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static u64 mem_cgroup_hierarchy_read(struct cgroup_subsys_state *css,
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struct cftype *cft)
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struct cftype *cft)
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{
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{
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