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cgroup: remove unnecessary 0 check from css_from_id()

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css_idr allocation starts at 1, so index 0 will never point to an
item. css_from_id() currently filters that before asking idr_find(),
but idr_find() would also just return NULL, so this is not needed.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Johannes Weiner 2016-06-17 12:24:27 -04:00 committed by Tejun Heo
parent 8c8a550218
commit d6ccc55e66
1 changed files with 1 additions and 1 deletions
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2
kernel/cgroup.c
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@ -6162,7 +6162,7 @@ struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,
struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss)
{
WARN_ON_ONCE(!rcu_read_lock_held());
return id > 0 ? idr_find(&ss->css_idr, id) : NULL;
return idr_find(&ss->css_idr, id);
}
/**