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mm/memcg: non-hierarchical mode is deprecated

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After commit bef8620cd8 ("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).

Link: https://lkml.kernel.org/r/20220403020833.26164-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wei Yang
2022-04-28 23:15:59 -07:00
committed by akpm
parent a9320aae68
commit c449d55992
1 changed files with 0 additions and 3 deletions
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3
mm/memcontrol.c
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@@ -6587,9 +6587,6 @@ void mem_cgroup_calculate_protection(struct mem_cgroup *root,
return; return;
parent = parent_mem_cgroup(memcg); parent = parent_mem_cgroup(memcg);
/* No parent means a non-hierarchical mode on v1 memcg */
if (!parent)
return;
if (parent == root) { if (parent == root) {
memcg->memory.emin = READ_ONCE(memcg->memory.min); memcg->memory.emin = READ_ONCE(memcg->memory.min);