linux-kernel - Re: [PATCH] mlxsw: core: Switch to kvfree

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Message-ID: <YbpGGiTtBvJnYvmZ@pc638.lan>
Date:   Wed, 15 Dec 2021 20:46:34 +0100
From:   Uladzislau Rezki <urezki@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Axtens <dja@...ens.net>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: Re: [PATCH] mlxsw: core: Switch to kvfree_rcu() API

On Wed, Dec 15, 2021 at 12:18:43PM +0100, Uladzislau Rezki (Sony) wrote:
> Instead of invoking a synchronize_rcu() to free a pointer
> after a grace period we can directly make use of new API
> that does the same but in more efficient way.
> 
> TO: David S. Miller <davem@...emloft.net>
> TO: Jakub Kicinski <kuba@...nel.org>
> TO: netdev@...r.kernel.org
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> ---
>  drivers/net/ethernet/mellanox/mlxsw/core.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
> index 3fd3812b8f31..47c29769759b 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/core.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
> @@ -2190,8 +2190,7 @@ void mlxsw_core_rx_listener_unregister(struct mlxsw_core *mlxsw_core,
>  	if (!rxl_item)
>  		return;
>  	list_del_rcu(&rxl_item->list);
> -	synchronize_rcu();
> -	kfree(rxl_item);
> +	kvfree_rcu(rxl_item);
>  }
>  EXPORT_SYMBOL(mlxsw_core_rx_listener_unregister);
>  
> -- 
> 2.30.2
> 
+ David S. Miller <davem@...emloft.net>
+ Jakub Kicinski <kuba@...nel.org>
+ netdev@...r.kernel.org

--
Vlad Rezki