Messages in this thread Patch in this message | | | Date | Tue, 24 Apr 2012 15:32:56 -0700 | From | Greg KH <> | Subject | [ 15/62] xen/gntdev: do not set VM_PFNMAP |
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3.3-stable review patch. If anyone has any objections, please let me know.
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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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