linux-kernel - [PATCH 12/17] nfsd: replace call_rcu by kfree_rcu for simple kmem_cache

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Message-Id: <20241013201704.49576-13-Julia.Lawall@inria.fr>
Date: Sun, 13 Oct 2024 22:16:59 +0200
From: Julia Lawall <Julia.Lawall@...ia.fr>
To: Chuck Lever <chuck.lever@...cle.com>
Cc: kernel-janitors@...r.kernel.org,
	vbabka@...e.cz,
	paulmck@...nel.org,
	Jeff Layton <jlayton@...nel.org>,
	Neil Brown <neilb@...e.de>,
	Olga Kornievskaia <okorniev@...hat.com>,
	Dai Ngo <Dai.Ngo@...cle.com>,
	Tom Talpey <tom@...pey.com>,
	linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 12/17] nfsd: 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>

---
 fs/nfsd/nfs4state.c |    9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 9a3ec916fb14..02adf1d551df 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -572,13 +572,6 @@ opaque_hashval(const void *ptr, int nbytes)
 	return x;
 }
 
-static void nfsd4_free_file_rcu(struct rcu_head *rcu)
-{
-	struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
-
-	kmem_cache_free(file_slab, fp);
-}
-
 void
 put_nfs4_file(struct nfs4_file *fi)
 {
@@ -586,7 +579,7 @@ put_nfs4_file(struct nfs4_file *fi)
 		nfsd4_file_hash_remove(fi);
 		WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
 		WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
-		call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
+		kfree_rcu(fi, fi_rcu);
 	}
 }