linux-next: build failure after merge of the vhost tree

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Hi all,

After merging the vhost tree, today's linux-next build (x86_64
allmodconfig) failed like this:

drivers/gpu/drm/virtio/virtgpu_kms.c: In function 'virtio_gpu_init':
drivers/gpu/drm/virtio/virtgpu_kms.c:153:38: error: 'VIRTIO_RING_F_INDIRECT_DESC' undeclared (first use in this function)
  153 |  if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
      |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/virtio/virtgpu_kms.c:153:38: note: each undeclared identifier is reported only once for each function it appears in

Caused by commit

  898952f9597e ("virtio: stop using legacy struct vring in kernel")

interacting with commit

  5edbb5608256 ("drm/virtio: fix ring free check")

from Linus' tree (post v5.6).

I have added the following merge fix patch for today.

From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Date: Tue, 7 Apr 2020 12:58:26 +1000
Subject: [PATCH] drm/virtio: fix up for include file changes

Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/virtio/virtgpu_kms.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 023a030ca7b9..f4ea4cef5e23 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -25,6 +25,7 @@
 
 #include <linux/virtio.h>
 #include <linux/virtio_config.h>
+#include <linux/virtio_ring.h>
 
 #include <drm/drm_file.h>
 
-- 
2.25.0

I do have to wonder why all this code has been added to the vhost tree
during the second week of the merge window (especially when I see it
rebased 4 times in one day :-().  Is it really intended for v5.7?
-- 
Cheers,
Stephen Rothwell

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