diff options
Diffstat (limited to 'drivers/xen/gntdev.c')
| -rw-r--r-- | drivers/xen/gntdev.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index b0f9e8fb0052..f914b26cf0c2 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -330,17 +330,26 @@ static int unmap_grant_pages(struct grant_map *map, int offset, int pages) /* ------------------------------------------------------------------ */ +static void gntdev_vma_open(struct vm_area_struct *vma) +{ + struct grant_map *map = vma->vm_private_data; + + pr_debug("gntdev_vma_open %p\n", vma); + atomic_inc(&map->users); +} + static void gntdev_vma_close(struct vm_area_struct *vma) { struct grant_map *map = vma->vm_private_data; - pr_debug("close %p\n", vma); + pr_debug("gntdev_vma_close %p\n", vma); map->vma = NULL; vma->vm_private_data = NULL; gntdev_put_map(map); } static struct vm_operations_struct gntdev_vmops = { + .open = gntdev_vma_open, .close = gntdev_vma_close, }; @@ -652,7 +661,10 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) vma->vm_ops = &gntdev_vmops; - vma->vm_flags |= VM_RESERVED|VM_DONTCOPY|VM_DONTEXPAND|VM_PFNMAP; + vma->vm_flags |= VM_RESERVED|VM_DONTEXPAND; + + if (use_ptemod) + vma->vm_flags |= VM_DONTCOPY|VM_PFNMAP; vma->vm_private_data = map; |