[066/143] mm: vmscan: use kvfree_rcu instead of call_rcu

Commit Message

Andrew Morton May 5, 2021, 1:36 a.m. UTC

From: Yang Shi <[e-mail]>
Subject: mm: vmscan: use kvfree_rcu instead of call_rcu

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.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Yang Shi <[e-mail]>
Acked-by: Roman Gushchin <[e-mail]>
Acked-by: Kirill Tkhai <[e-mail]>
Reviewed-by: Shakeel Butt <[e-mail]>
Cc: Dave Chinner <[e-mail]>
Cc: Johannes Weiner <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 mm/vmscan.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

Patch

--- a/mm/vmscan.c~mm-vmscan-use-kvfree_rcu-instead-of-call_rcu
+++ a/mm/vmscan.c
@@ -192,11 +192,6 @@  static inline int shrinker_map_size(int
 	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(struc
 		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;