Re: [PATCH v4 3/7] cgroup: protect cgroup->nr_(dying_)descendants by css_set_lock

[Tejun Heo]

On Fri, Nov 30, 2018 at 03:47:41PM -0800, Roman Gushchin wrote:
> +	 * nr_descendants and nr_dying_descendants are protected
> +	 * by cgroup_mutex and css_set_lock.

Can you be a bit more specific - hold both for writes, either for
reads.

Thanks.

-- 
tejun