[ 15/62] xen/gntdev: do not set VM_PFNMAP

From: Greg KH
Date: Tue Apr 24 2012 - 19:01:07 EST


3.3-stable review patch. If anyone has any objections, please let me know.

------------------

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

commit e8e937be971d706061dc56220ff3605ab77622a7 upstream.

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.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/xen/gntdev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -722,7 +722,7 @@ static int gntdev_mmap(struct file *flip
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;



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