[patch 120/155] mm: vmpressure: use mem_cgroup_is_root API

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From: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Subject: mm: vmpressure: use mem_cgroup_is_root API

Use mem_cgroup_is_root() API to check if memcg is root memcg instead of
open coding.

Link: http://lkml.kernel.org/r/1581398649-125989-2-git-send-email-yang.shi@xxxxxxxxxxxxxxxxx
Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/vmpressure.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/vmpressure.c~mm-vmpressure-use-mem_cgroup_is_root-api
+++ a/mm/vmpressure.c
@@ -280,7 +280,7 @@ void vmpressure(gfp_t gfp, struct mem_cg
 		enum vmpressure_levels level;
 
 		/* For now, no users for root-level efficiency */
-		if (!memcg || memcg == root_mem_cgroup)
+		if (!memcg || mem_cgroup_is_root(memcg))
 			return;
 
 		spin_lock(&vmpr->sr_lock);
_




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