* [PATCH v2] xen/gntdev: do not set VM_PFNMAP
@ 2012-04-03 17:05 Stefano Stabellini
0 siblings, 0 replies; only message in thread
From: Stefano Stabellini @ 2012-04-03 17:05 UTC (permalink / raw)
To: konrad.wilk
Cc: Stefano.Stabellini, xen-devel, linux-kernel, stable, Stefano Stabellini
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.
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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