Re: [PATCH 2/8] cgroup: implement cgroup_from_id()

Tejun Heo
2013-04-08T15:43:27Z

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