linux-kernel - [PATCH 1/2] virtio_pci: Don't make an extra copy of cpu affinity mask

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Date:   Thu, 19 Oct 2023 12:16:24 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org, kernel-team@...udflare.com,
        Caleb Raitto <caraitto@...gle.com>
Subject: [PATCH 1/2] virtio_pci: Don't make an extra copy of cpu affinity mask

Since commit 19e226e8cc5d ("virtio: Make vp_set_vq_affinity() take a
mask.") it is actually not needed to have a local copy of the cpu mask.

Pass the cpu mask we got as argument to set the irq affinity hint.

Cc: Caleb Raitto <caraitto@...gle.com>
Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
---
 drivers/virtio/virtio_pci_common.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index c2524a7207cf..8927bc338f06 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -433,21 +433,14 @@ int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask)
 	struct virtio_device *vdev = vq->vdev;
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
 	struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
-	struct cpumask *mask;
 	unsigned int irq;
 
 	if (!vq->callback)
 		return -EINVAL;
 
 	if (vp_dev->msix_enabled) {
-		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);
-		else {
-			cpumask_copy(mask, cpu_mask);
-			irq_set_affinity_hint(irq, mask);
-		}
+		irq_set_affinity_hint(irq, cpu_mask);
 	}
 	return 0;
 }
-- 
2.41.0