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Date: Mon, 8 Apr 2013 08:43:19 -0700
From: Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH 2/8] cgroup: implement cgroup_from_id()
Message-ID: <20130408154319.GD3021@htj.dyndns.org>
References: <51627DA9.7020507@huawei.com>
 <51627DEB.4090104@huawei.com>
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Sender: owner-linux-mm@kvack.org
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To: Li Zefan <lizefan@huawei.com>
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 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(), ...);

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

Thanks.

-- 
tejun

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