netdev - Re: [PATCH 16/17] netfilter: expect: replace call_rcu by kfree_rcu for simple kmem_cache

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Message-ID: <Zw-u_56SSySvioJu@pc636>
Date: Wed, 16 Oct 2024 14:18:07 +0200
From: Uladzislau Rezki <urezki@...il.com>
To: Julia Lawall <Julia.Lawall@...ia.fr>,
	Pablo Neira Ayuso <pablo@...filter.org>
Cc: Pablo Neira Ayuso <pablo@...filter.org>,
	kernel-janitors@...r.kernel.org, vbabka@...e.cz, paulmck@...nel.org,
	Jozsef Kadlecsik <kadlec@...filter.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/17] netfilter: expect: replace call_rcu by kfree_rcu
 for simple kmem_cache_free callback

On Sun, Oct 13, 2024 at 10:17:03PM +0200, Julia Lawall wrote:
> 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>
> 
> ---
>  net/netfilter/nf_conntrack_expect.c |   10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
> index 21fa550966f0..9dcaef6f3663 100644
> --- a/net/netfilter/nf_conntrack_expect.c
> +++ b/net/netfilter/nf_conntrack_expect.c
> @@ -367,18 +367,10 @@ void nf_ct_expect_init(struct nf_conntrack_expect *exp, unsigned int class,
>  }
>  EXPORT_SYMBOL_GPL(nf_ct_expect_init);
>  
> -static void nf_ct_expect_free_rcu(struct rcu_head *head)
> -{
> -	struct nf_conntrack_expect *exp;
> -
> -	exp = container_of(head, struct nf_conntrack_expect, rcu);
> -	kmem_cache_free(nf_ct_expect_cachep, exp);
> -}
> -
>  void nf_ct_expect_put(struct nf_conntrack_expect *exp)
>  {
>  	if (refcount_dec_and_test(&exp->use))
> -		call_rcu(&exp->rcu, nf_ct_expect_free_rcu);
> +		kfree_rcu(exp, rcu);
>  }
>  EXPORT_SYMBOL_GPL(nf_ct_expect_put);
>  
> 
> 
Reviewed-by: Uladzislau Rezki (Sony) <urezki@...il.com>

--
Uladzislau Rezki