[PATCH] mm/memcg: non-hierarchical mode is deprecated

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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





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