Hello,

On Mon, Jul 29, 2013 at 03:07:48PM +0800, Li Zefan wrote:
> @@ -4590,6 +4599,9 @@ static void cgroup_offline_fn(struct work_struct *work)
>       /* delete this cgroup from parent->children */
>       list_del_rcu(&cgrp->sibling);
>  
> +     if (cgrp->id)
> +             idr_remove(&cgrp->root->cgroup_idr, cgrp->id);
> +

Yeap, if we're gonna allow lookups, removal should happen here but can
we please add short comment explaining why that is?  Also, do we want
to clear cgrp->id?

Thanks.

-- 
tejun
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