Re: [PATCH v2] mm: memcg/slab: Fix return child memcg objcg for root memcg

[Roman Gushchin <guro@xxxxxx>]

On Wed, Oct 28, 2020 at 11:50:10AM +0800, Muchun Song wrote:
> Consider the following memcg hierarchy.
> 
>                     root
>                    /    \
>                   A      B
> 
> If we get the objcg of memcg A failed, the get_obj_cgroup_from_current
> can return the wrong objcg for the root memcg.
> 
> Fixes: bf4f059954dc ("mm: memcg/slab: obj_cgroup API")
> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>

Acked-by: Roman Gushchin <guro@xxxxxx>

Thanks!