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From:   Yang Shi <shy828301@gmail.com>
To:     guro@fb.com, ktkhai@virtuozzo.com, vbabka@suse.cz,
        shakeelb@google.com, david@fromorbit.com, hannes@cmpxchg.org,
        mhocko@suse.com, akpm@linux-foundation.org
Cc:     shy828301@gmail.com, linux-mm@kvack.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [v8 PATCH 05/13] mm: vmscan: use kvfree_rcu instead of call_rcu
Date:   Tue, 16 Feb 2021 16:13:14 -0800
Message-Id: <20210217001322.2226796-6-shy828301@gmail.com>
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References: <20210217001322.2226796-1-shy828301@gmail.com>
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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.

Signed-off-by: Yang Shi <shy828301@gmail.com>
---
 mm/vmscan.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2e753c2516fa..c2a309acd86b 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)
 {
@@ -219,7 +214,7 @@ static int expand_one_shrinker_map(struct mem_cgroup *memcg,
 		memset((void *)new->map + old_size, 0, size - old_size);
 
 		rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, new);
-		call_rcu(&old->rcu, free_shrinker_map_rcu);
+		kvfree_rcu(old);
 	}
 
 	return 0;
-- 
2.26.2