xen/gntdev: do not set VM_PFNMAP

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@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index f914b26cf0c2efdfac05b8af9e6d9b8a37124dfc..b4e830eb3f26bc4848e9980636fde7a995b49875 100644 (file)
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -664,7 +664,7 @@ 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;