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

Li Zefan
2013-04-09T03:13:06Z

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);