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

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Message-Id: <20221021062734.228881-3-shaoqin.huang@intel.com>
Date:   Thu, 20 Oct 2022 23:27:34 -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 2/2] virtio_ring: 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_ring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 2e7689bb933b..723c4e29e1d3 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1052,7 +1052,7 @@ static int vring_alloc_queue_split(struct vring_virtqueue_split *vring_split,
 	dma_addr_t dma_addr;
 
 	/* We assume num is a power of 2. */
-	if (num & (num - 1)) {
+	if (!is_power_of_2(num)) {
 		dev_warn(&vdev->dev, "Bad virtqueue length %u\n", num);
 		return -EINVAL;
 	}
-- 
2.34.1