linux-kernel - [PATCH] virtio: add VIRTIO_RING_NO

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Message-ID: <20190906124130.129870-1-matej.genci@nutanix.com>
Date:   Fri, 6 Sep 2019 12:42:14 +0000
From:   Matej Genci <matej.genci@...anix.com>
To:     "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "mst@...hat.com" <mst@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Matej Genci <matej.genci@...anix.com>
Subject: [PATCH] virtio: add VIRTIO_RING_NO_LEGACY

Add macro to disable legacy functions vring_init and vring_size.

Signed-off-by: Matej Genci <matej.genci@...anix.com>
---
 include/uapi/linux/virtio_ring.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/linux/virtio_ring.h b/include/uapi/linux/virtio_ring.h
index 4c4e24c291a5..496db2f33830 100644
--- a/include/uapi/linux/virtio_ring.h
+++ b/include/uapi/linux/virtio_ring.h
@@ -164,6 +164,8 @@ struct vring {
 #define vring_used_event(vr) ((vr)->avail->ring[(vr)->num])
 #define vring_avail_event(vr) (*(__virtio16 *)&(vr)->used->ring[(vr)->num])
 
+#ifndef VIRTIO_RING_NO_LEGACY
+
 static inline void vring_init(struct vring *vr, unsigned int num, void *p,
 			      unsigned long align)
 {
@@ -181,6 +183,8 @@ static inline unsigned vring_size(unsigned int num, unsigned long align)
 		+ sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num;
 }
 
+#endif
+
 /* The following is used with USED_EVENT_IDX and AVAIL_EVENT_IDX */
 /* Assuming a given event_idx value from the other side, if
  * we have just incremented index from old to new_idx,
-- 
2.22.0