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: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Thanks!
> ---
> mm/memcontrol.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 2cd8bfdec379..3ceb9b8592b1 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -6587,9 +6587,6 @@ void mem_cgroup_calculate_protection(struct mem_cgroup *root,
> return;
>
> parent = parent_mem_cgroup(memcg);
> - /* No parent means a non-hierarchical mode on v1 memcg */
> - if (!parent)
> - return;
>
> if (parent == root) {
> memcg->memory.emin = READ_ONCE(memcg->memory.min);
> --
> 2.33.1
>
