[PATCH 5/6] drm: use vma_pages() to replace (vm_end - vm_start) >> PAGE_SHIFT

[Libin]

(*->vm_end - *->vm_start) >> PAGE_SHIFT operation is implemented
as a inline funcion vma_pages() in linux/mm.h, so using it.

Signed-off-by: Libin <huawei.libin at huawei.com>
---
 drivers/gpu/drm/ttm/ttm_bo_vm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index 74705f3..3df9f16 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -147,7 +147,7 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 
 	page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
 	    bo->vm_node->start - vma->vm_pgoff;
-	page_last = ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) +
+	page_last = vma_pages(vma) +
 	    bo->vm_node->start - vma->vm_pgoff;
 
 	if (unlikely(page_offset >= bo->num_pages)) {
@@ -258,7 +258,7 @@ int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
 
 	read_lock(&bdev->vm_lock);
 	bo = ttm_bo_vm_lookup_rb(bdev, vma->vm_pgoff,
-				 (vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
+				 vma_pages(vma));
 	if (likely(bo != NULL) && !kref_get_unless_zero(&bo->kref))
 		bo = NULL;
 	read_unlock(&bdev->vm_lock);
-- 
1.8.2.1