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>
---
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
