linux-kernel - [PATCH 09/17] block: replace call_rcu by kfree_rcu for simple kmem_cache

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Message-Id: <20241013201704.49576-10-Julia.Lawall@inria.fr>
Date: Sun, 13 Oct 2024 22:16:56 +0200
From: Julia Lawall <Julia.Lawall@...ia.fr>
To: Jens Axboe <axboe@...nel.dk>
Cc: kernel-janitors@...r.kernel.org,
	vbabka@...e.cz,
	paulmck@...nel.org,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 09/17] block: replace call_rcu by kfree_rcu for simple kmem_cache_free callback

Since SLOB was removed and since
commit 6c6c47b063b5 ("mm, slab: call kvfree_rcu_barrier() from kmem_cache_destroy()"),
it is not necessary to use call_rcu when the callback only performs
kmem_cache_free. Use kfree_rcu() directly.

The changes were made using Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>

---
 block/blk-ioc.c |    9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index 25dd4db11121..ce82770c72ab 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c
@@ -32,13 +32,6 @@ static void get_io_context(struct io_context *ioc)
 	atomic_long_inc(&ioc->refcount);
 }
 
-static void icq_free_icq_rcu(struct rcu_head *head)
-{
-	struct io_cq *icq = container_of(head, struct io_cq, __rcu_head);
-
-	kmem_cache_free(icq->__rcu_icq_cache, icq);
-}
-
 /*
  * Exit an icq. Called with ioc locked for blk-mq, and with both ioc
  * and queue locked for legacy.
@@ -102,7 +95,7 @@ static void ioc_destroy_icq(struct io_cq *icq)
 	 */
 	icq->__rcu_icq_cache = et->icq_cache;
 	icq->flags |= ICQ_DESTROYED;
-	call_rcu(&icq->__rcu_head, icq_free_icq_rcu);
+	kfree_rcu(icq, __rcu_head);
 }
 
 /*