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xen/gntdev: do not set VM_PFNMAP 

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.

CC: stable@kernel.org
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Stefano Stabellini 2012-04-03 18:05:47 +01:00 committed by Konrad Rzeszutek Wilk
parent 6b5e7d9ef7
commit e8e937be97
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/gntdev.c
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@ -722,7 +722,7 @@ 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;