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    Subject[ 15/62] xen/gntdev: do not set VM_PFNMAP
    3.3-stable review patch.  If anyone has any objections, please let me know.

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

    From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

    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>

    ---
    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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