linux-kernel - Re: [PATCH v2] virtio_pci: Switch away from deprecated irq_set_affinity

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Message-ID: <1698291366.898542-1-xuanzhuo@linux.alibaba.com>
Date:   Thu, 26 Oct 2023 11:36:06 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org,
        kernel-team@...udflare.com,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2] virtio_pci: Switch away from deprecated irq_set_affinity_hint

On Wed, 25 Oct 2023 16:53:19 +0200, Jakub Sitnicki <jakub@...udflare.com> wrote:
> Since commit 65c7cdedeb30 ("genirq: Provide new interfaces for affinity
> hints") irq_set_affinity_hint is being phased out.
>
> Switch to new interfaces for setting and applying irq affinity hints.
>
> Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>

Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>

Thanks.

> ---
> v2:
>  - Leave cpumask_copy as is. We can't pass pointer to stack memory as hint.
>    Proposed a change to IRQ affinity interface to address this limitation:
>    https://lore.kernel.org/r/20231025141517.375378-1-jakub@cloudflare.com
>
> v1: https://lore.kernel.org/r/20231019101625.412936-2-jakub@cloudflare.com
> ---
>  drivers/virtio/virtio_pci_common.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
> index c2524a7207cf..7a5593997e0e 100644
> --- a/drivers/virtio/virtio_pci_common.c
> +++ b/drivers/virtio/virtio_pci_common.c
> @@ -242,7 +242,7 @@ void vp_del_vqs(struct virtio_device *vdev)
>  			if (v != VIRTIO_MSI_NO_VECTOR) {
>  				int irq = pci_irq_vector(vp_dev->pci_dev, v);
>
> -				irq_set_affinity_hint(irq, NULL);
> +				irq_update_affinity_hint(irq, NULL);
>  				free_irq(irq, vq);
>  			}
>  		}
> @@ -443,10 +443,10 @@ int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask)
>  		mask = vp_dev->msix_affinity_masks[info->msix_vector];
>  		irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector);
>  		if (!cpu_mask)
> -			irq_set_affinity_hint(irq, NULL);
> +			irq_update_affinity_hint(irq, NULL);
>  		else {
>  			cpumask_copy(mask, cpu_mask);
> -			irq_set_affinity_hint(irq, mask);
> +			irq_set_affinity_and_hint(irq, mask);
>  		}
>  	}
>  	return 0;
> --
> 2.41.0
>