linux-kernel - [PATCH] virtio_ring: remove unnecessary to_vvq call in virtqueue_enable_cb_prepare

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Message-ID: <20220622081038.1681-1-wangdeming@inspur.com>
Date:   Wed, 22 Jun 2022 04:10:38 -0400
From:   Deming Wang <wangdeming@...pur.com>
To:     <mst@...hat.com>, <jasowang@...hat.com>
CC:     <virtualization@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>, Deming Wang <wangdeming@...pur.com>
Subject: [PATCH] virtio_ring: remove unnecessary to_vvq call in virtqueue_enable_cb_prepare_packed

It passes '_vq' to virtqueue_use_indirect(), which still calls
to_vvq to get 'vq', let's directly pass 'vq'. It can avoid
unnecessary call of to_vvq in hot path.

Signed-off-by: Deming Wang <wangdeming@...pur.com>
---
 drivers/virtio/virtio_ring.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 13a7348cedff..3418e10f21a5 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1486,10 +1486,8 @@ static void virtqueue_disable_cb_packed(struct virtqueue *_vq)
 	}
 }
 
-static unsigned int virtqueue_enable_cb_prepare_packed(struct virtqueue *_vq)
+static unsigned int virtqueue_enable_cb_prepare_packed(struct vring_virtqueue *vq)
 {
-	struct vring_virtqueue *vq = to_vvq(_vq);
-
 	START_USE(vq);
 
 	/*
@@ -2032,7 +2030,7 @@ unsigned int virtqueue_enable_cb_prepare(struct virtqueue *_vq)
 	if (vq->event_triggered)
 		vq->event_triggered = false;
 
-	return vq->packed_ring ? virtqueue_enable_cb_prepare_packed(_vq) :
+	return vq->packed_ring ? virtqueue_enable_cb_prepare_packed(vq) :
 				 virtqueue_enable_cb_prepare_split(_vq);
 }
 EXPORT_SYMBOL_GPL(virtqueue_enable_cb_prepare);
-- 
2.27.0