[RFC PATCH 01/10] memcg: remove root memcg check from refill_stock

[Shakeel Butt]

refill_stock can not be called with root memcg, so there is no need to
check it.

Signed-off-by: Shakeel Butt <shakeel.butt@xxxxxxxxx>
---
 mm/memcontrol.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b29433eb17fa..c09a32e93d39 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1883,6 +1883,7 @@ static void __refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
 		drain_stock(stock);
 }
 
+/* Should never be called with root_mem_cgroup. */
 static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
 {
 	unsigned long flags;
@@ -1892,8 +1893,6 @@ static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
 		 * In case of unlikely failure to lock percpu stock_lock
 		 * uncharge memcg directly.
 		 */
-		if (mem_cgroup_is_root(memcg))
-			return;
 		page_counter_uncharge(&memcg->memory, nr_pages);
 		if (do_memsw_account())
 			page_counter_uncharge(&memcg->memsw, nr_pages);
-- 
2.47.1