linux-kernel - Re: [PATCH 2/8] cgroup: implement cgroup_from

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Message-ID: <20130408154319.GD3021@htj.dyndns.org>
Date:	Mon, 8 Apr 2013 08:43:19 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Glauber Costa <glommer@...allels.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 2/8] cgroup: implement cgroup_from_id()

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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