Patch "xen/gntdev: do not set VM_PFNMAP" has been added to the 3.0-stable tree

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This is a note to let you know that I've just added the patch titled

    xen/gntdev: do not set VM_PFNMAP

to the 3.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     xen-gntdev-do-not-set-vm_pfnmap.patch
and it can be found in the queue-3.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From e8e937be971d706061dc56220ff3605ab77622a7 Mon Sep 17 00:00:00 2001
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Tue, 3 Apr 2012 18:05:47 +0100
Subject: xen/gntdev: do not set VM_PFNMAP

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
@@ -664,7 +664,7 @@ 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;
 


Patches currently in stable-queue which might be from stefano.stabellini@xxxxxxxxxxxxx are

queue-3.0/xen-xenbus-add-quirk-to-deal-with-misconfigured-backends.patch
queue-3.0/xen-gntdev-do-not-set-vm_pfnmap.patch
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