linux-kernel - Re: [PATCH 17/17] netfilter: xt_hashlimit: replace call_rcu by kfree_rcu for simple kmem_cache

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Message-ID: <Zw-vXsVQCfxm7DM1@pc636>
Date: Wed, 16 Oct 2024 14:19:42 +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 17/17] netfilter: xt_hashlimit: replace call_rcu by
 kfree_rcu for simple kmem_cache_free callback

On Sun, Oct 13, 2024 at 10:17:04PM +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/xt_hashlimit.c |    9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
> 
> diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
> index 0859b8f76764..c2b9b954eb53 100644
> --- a/net/netfilter/xt_hashlimit.c
> +++ b/net/netfilter/xt_hashlimit.c
> @@ -256,18 +256,11 @@ dsthash_alloc_init(struct xt_hashlimit_htable *ht,
>  	return ent;
>  }
>  
> -static void dsthash_free_rcu(struct rcu_head *head)
> -{
> -	struct dsthash_ent *ent = container_of(head, struct dsthash_ent, rcu);
> -
> -	kmem_cache_free(hashlimit_cachep, ent);
> -}
> -
>  static inline void
>  dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent)
>  {
>  	hlist_del_rcu(&ent->node);
> -	call_rcu(&ent->rcu, dsthash_free_rcu);
> +	kfree_rcu(ent, rcu);
>  	ht->count--;
>  }
>  static void htable_gc(struct work_struct *work);
> 
> 
Reviewed-by: Uladzislau Rezki (Sony) <urezki@...il.com>

--
Uladzislau Rezki