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Date: Tue, 9 Apr 2013 11:12:09 +0800
From: Li Zefan <lizefan@huawei.com>
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Subject: Re: [PATCH 2/8] cgroup: implement cgroup_from_id()
References: <51627DA9.7020507@huawei.com> <51627DEB.4090104@huawei.com> <20130408154319.GD3021@htj.dyndns.org>
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To: Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, Glauber Costa <glommer@parallels.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Michal Hocko <mhocko@suse.cz>, Johannes Weiner <hannes@cmpxchg.org>, LKML <linux-kernel@vger.kernel.org>, Cgroups <cgroups@vger.kernel.org>, linux-mm@kvack.org

On 2013/4/8 23:43, Tejun Heo wrote:
> On Mon, Apr 08, 2013 at 04:20:59PM +0800, Li Zefan wrote:
>> +/**
>> + * cgroup_from_id - lookup cgroup by id
>> + * @ss: cgroup subsys to be looked into.
>> + * @id: the id
>> + *
>> + * Returns pointer to cgroup if there is valid one with id.
>> + * NULL if not. Should be called under rcu_read_lock()
>> + */
>> +struct cgroup *cgroup_from_id(struct cgroup_subsys *ss, int id)
>> +{
> 
> 	rcu_lockdep_assert(rcu_read_lock_held(), ..
.);

will update

> 
>> +	return idr_find(&ss->root->cgroup_idr, id);

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