[v10 PATCH 05/13] mm: vmscan: use kvfree_rcu instead of call_rcu

[Yang Shi]

Using kvfree_rcu() to free the old shrinker_maps instead of call_rcu().
We don't have to define a dedicated callback for call_rcu() anymore.

Acked-by: Roman Gushchin <guro@xxxxxx>
Acked-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Signed-off-by: Yang Shi <shy828301@xxxxxxxxx>
---
 mm/vmscan.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 641a0b8b4ea9..bbe13985ae05 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -192,11 +192,6 @@ static inline int shrinker_map_size(int nr_items)
 	return (DIV_ROUND_UP(nr_items, BITS_PER_LONG) * sizeof(unsigned long));
 }
 
-static void free_shrinker_map_rcu(struct rcu_head *head)
-{
-	kvfree(container_of(head, struct memcg_shrinker_map, rcu));
-}
-
 static int expand_one_shrinker_map(struct mem_cgroup *memcg,
 				   int size, int old_size)
 {
@@ -220,7 +215,7 @@ static int expand_one_shrinker_map(struct mem_cgroup *memcg,
 		memset((void *)new->map + old_size, 0, size - old_size);
 
 		rcu_assign_pointer(pn->shrinker_map, new);
-		call_rcu(&old->rcu, free_shrinker_map_rcu);
+		kvfree_rcu(old, rcu);
 	}
 
 	return 0;
-- 
2.26.2