Messages in this thread Patch in this message | | | From | Stefano Stabellini <> | Subject | [PATCH] xen/gntdev: do not set VM_PFNMAP | Date | Tue, 3 Apr 2012 12:25:02 +0100 |
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Since when we are using the m2p_override it is not true anymore that the mmap'ed area doesn't have corresponsing struct pages.
Removing the VM_PFNMAP flag makes get_user_pages work on the mmap'ed user vma. An example test case would be using a Xen userspace block backend (QDISK) on a file on NFS using O_DIRECT.
The patch should be backported back to 2.6.38.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> --- drivers/xen/gntdev.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 99d8151..1ffd03b 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -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; -- 1.7.2.5
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