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From: Leon Romanovsky <leon@kernel.org>
To: Nitesh Narayan Lal <nitesh@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
	intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
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	somnath.kotur@broadcom.com, nilal@redhat.com
Subject: Re: [PATCH v1 14/14] net/mlx4: Use irq_update_affinity_hint
Date: Mon, 21 Jun 2021 11:01:06 +0300	[thread overview]
Message-ID: <YNBHQvo1uDfBbr5c@unreal> (raw)
In-Reply-To: <20210617182242.8637-15-nitesh@redhat.com>

On Thu, Jun 17, 2021 at 02:22:42PM -0400, Nitesh Narayan Lal wrote:
> The driver uses irq_set_affinity_hint() to update the affinity_hint mask
> that is consumed by the userspace to distribute the interrupts. However,
> under the hood irq_set_affinity_hint() also applies the provided cpumask
> (if not NULL) as the affinity for the given interrupt which is an
> undocumented side effect.
> 
> To remove this side effect irq_set_affinity_hint() has been marked
> as deprecated and new interfaces have been introduced. Hence, replace the
> irq_set_affinity_hint() with the new interface irq_update_affinity_hint()
> that only updates the affinity_hint pointer.
> 
> Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
> ---
>  drivers/net/ethernet/mellanox/mlx4/eq.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c
> index 9e48509ed3b2..f549d697ca95 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/eq.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/eq.c
> @@ -244,9 +244,9 @@ static void mlx4_set_eq_affinity_hint(struct mlx4_priv *priv, int vec)
>  	    cpumask_empty(eq->affinity_mask))
>  		return;
>  
> -	hint_err = irq_set_affinity_hint(eq->irq, eq->affinity_mask);
> +	hint_err = irq_update_affinity_hint(eq->irq, eq->affinity_mask);
>  	if (hint_err)
> -		mlx4_warn(dev, "irq_set_affinity_hint failed, err %d\n", hint_err);
> +		mlx4_warn(dev, "irq_update_affinity_hint failed, err %d\n", hint_err);
>  }
>  #endif
>  
> @@ -1124,7 +1124,7 @@ static void mlx4_free_irqs(struct mlx4_dev *dev)
>  		if (eq_table->eq[i].have_irq) {
>  			free_cpumask_var(eq_table->eq[i].affinity_mask);
>  #if defined(CONFIG_SMP)
> -			irq_set_affinity_hint(eq_table->eq[i].irq, NULL);
> +			irq_update_affinity_hint(eq_table->eq[i].irq, NULL);
>  #endif

This #if/endif can be deleted.

Thanks,
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>

  reply	other threads:[~2021-06-21  8:01 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-17 18:22 [PATCH v1 00/14] genirq: Cleanup the usage of irq_set_affinity_hint Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 01/14] genirq: Provide new interfaces for affinity hints Nitesh Narayan Lal
2021-06-25 17:52   ` Nitesh Lal
2021-06-17 18:22 ` [PATCH v1 02/14] iavf: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 03/14] i40e: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 04/14] scsi: megaraid_sas: Use irq_set_affinity_and_hint Nitesh Narayan Lal
2021-06-17 19:31   ` Robin Murphy
2021-06-17 19:34     ` Nitesh Lal
2021-06-17 18:22 ` [PATCH v1 05/14] scsi: mpt3sas: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 06/14] RDMA/i40iw: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 07/14] enic: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 08/14] be2net: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 09/14] ixgbe: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 10/14] mailbox: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 11/14] scsi: lpfc: Use irq_set_affinity Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 12/14] hinic: Use irq_set_affinity_and_hint Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 13/14] net/mlx5: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-06-21  8:01   ` Leon Romanovsky
2021-06-17 18:22 ` [PATCH v1 14/14] net/mlx4: " Nitesh Narayan Lal
2021-06-21  8:01   ` Leon Romanovsky [this message]
2021-06-21 12:59     ` Nitesh Lal
2021-06-25 21:08     ` Nitesh Lal

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