linux-kernel - [PATCH 1/2] virtio_pci: use helper function is_power_of

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Date:   Thu, 20 Oct 2022 23:27:33 -0700
From:   shaoqin.huang@...el.com
To:     mst@...hat.com, jasowang@...hat.com
Cc:     Shaoqin Huang <shaoqin.huang@...el.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] virtio_pci: use helper function is_power_of_2()

From: Shaoqin Huang <shaoqin.huang@...el.com>

Use helper function is_power_of_2() to check if num is power of two.
Minor readability improvement.

Signed-off-by: Shaoqin Huang <shaoqin.huang@...el.com>
---
 drivers/virtio/virtio_pci_modern.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index c3b9f2761849..207294bd7b9d 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -310,7 +310,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 	if (!num || vp_modern_get_queue_enable(mdev, index))
 		return ERR_PTR(-ENOENT);
 
-	if (num & (num - 1)) {
+	if (!is_power_of_2(num)) {
 		dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num);
 		return ERR_PTR(-EINVAL);
 	}
-- 
2.34.1