linux-kernel - Re: [PATCH v2 13/14] RDMA/rxe: Rename kfree_rcu() to kvfree_rcu

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Date:   Wed, 15 Mar 2023 13:38:31 -0500
From:   Bob Pearson <rpearsonhpe@...il.com>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Zhu Yanjun <zyjzyj2000@...il.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Devesh Sharma <devesh.s.sharma@...cle.com>
Cc:     "Paul E . McKenney" <paulmck@...nel.org>,
        Zhu Yanjun <yanjun.zhu@...ux.dev>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 13/14] RDMA/rxe: Rename kfree_rcu() to
 kvfree_rcu_mightsleep()

On 3/15/23 13:19, Joel Fernandes (Google) wrote:
> The k[v]free_rcu() macro's single-argument form is deprecated.
> Therefore switch to the new k[v]free_rcu_mightsleep() variant. The goal
> is to avoid accidental use of the single-argument forms, which can
> introduce functionality bugs in atomic contexts and latency bugs in
> non-atomic contexts.
> 
> There is no functionality change with this patch.
> 
> Link: https://lore.kernel.org/rcu/20230201150815.409582-1-urezki@gmail.com
> Acked-by: Zhu Yanjun <zyjzyj2000@...il.com>
> Reviewed-by: Bob Pearson <rpearsonhpe@...il.com>
> Reviewed-by: Paul E. McKenney <paulmck@...nel.org>
> Fixes: 72a03627443d ("RDMA/rxe: Remove rxe_alloc()")
> Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> ---
>  drivers/infiniband/sw/rxe/rxe_mr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c
> index b10aa1580a64..ae3a100e18fb 100644
> --- a/drivers/infiniband/sw/rxe/rxe_mr.c
> +++ b/drivers/infiniband/sw/rxe/rxe_mr.c
> @@ -731,7 +731,7 @@ int rxe_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
>  		return -EINVAL;
>  
>  	rxe_cleanup(mr);
> -	kfree_rcu(mr);
> +	kfree_rcu_mightsleep(mr);
>  	return 0;
>  }
>  
Please replace kfree_rcu_mightsleep() by kfree(). There is no need to delay the kfree(mr).

Bob