[PATCH v2] xen/gntdev: do not set VM_PFNMAP

[Stefano Stabellini]

Since we are using the m2p_override we do have struct pages
corresponding to the user vma mmap'ed by gntdev.

Removing the VM_PFNMAP flag makes get_user_pages work on that vma.
An example test case would be using a Xen userspace block backend
(QDISK) on a file on NFS using O_DIRECT.

The patch should be backported back to 2.6.38.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 drivers/xen/gntdev.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 99d8151..1ffd03b 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -722,7 +722,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
 	vma->vm_flags |= VM_RESERVED|VM_DONTEXPAND;
 
 	if (use_ptemod)
-		vma->vm_flags |= VM_DONTCOPY|VM_PFNMAP;
+		vma->vm_flags |= VM_DONTCOPY;
 
 	vma->vm_private_data = map;
 
-- 
1.7.2.5

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