Subject: linux-next: build failure after merge of the drm-intel tree

From: Stephen Rothwell <[email-masked]>
Date: Fri, 13 Jul 2018 11:54:19 +1000

Hi all,

[Dave cc'd because this will probably turn up in the drm tree soon.]

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

drivers/gpu/drm/i915/gvt/kvmgt.c: In function 'gvt_dma_map_page':
drivers/gpu/drm/i915/gvt/kvmgt.c:188:17: error: 'pfn' undeclared (first use in this function); did you mean 'gfn'?
  if (!pfn_valid(pfn)) {
                 ^~~

Caused by commit

  79e542f5af79 ("drm/i915/kvmgt: Support setting dma map for huge pages")

interacting with commit

  39b4cbadb9a9 ("drm/i915/kvmgt: Check the pfn got from vfio_pin_pages")

from Linus' tree (v4.18-rc1).

I added the following merge fix patch:

From: Stephen Rothwell <[email-masked]>
Date: Fri, 13 Jul 2018 11:48:41 +1000
Subject: [PATCH] drm/i915/kvmgt: merge fixup for "Check the pfn got from
 vfio_pin_pages"

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 drivers/gpu/drm/i915/gvt/kvmgt.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 718ab307a500..4d2f53ae9f0f 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -185,12 +185,6 @@ static int gvt_dma_map_page(struct intel_vgpu *vgpu, unsigned long gfn,
 	if (ret)
 		return ret;
 
-	if (!pfn_valid(pfn)) {
-		gvt_vgpu_err("pfn 0x%lx is not mem backed\n", pfn);
-		vfio_unpin_pages(mdev_dev(vgpu->vdev.mdev), &gfn, 1);
-		return -EINVAL;
-	}
-
 	/* Setup DMA mapping. */
 	*dma_addr = dma_map_page(dev, page, 0, size, PCI_DMA_BIDIRECTIONAL);
 	ret = dma_mapping_error(dev, *dma_addr);
-- 
2.18.0

-- 
Cheers,
Stephen Rothwell