On Sun, Apr 03, 2022 at 02:08:33AM +0000, Wei Yang wrote:
> After commit bef8620cd8e0 ("mm: memcg: deprecate the non-hierarchical
> mode"), we won't have a NULL parent except root_mem_cgroup. And this
> case is handled when (memcg == root).
>
> Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
> CC: Roman Gushchin <roman.gushchin@xxxxxxxxx>
> CC: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
