mm: use vma_pages() to replace (vm_end - vm_start) >> PAGE_SHIFT

(*->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@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 95d0cce63583..a101bbcacfd7 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2904,7 +2904,7 @@ static inline void unmap_mapping_range_tree(struct rb_root *root,
                         details->first_index, details->last_index) {
 
                 vba = vma->vm_pgoff;
-                vea = vba + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) - 1;
+                vea = vba + vma_pages(vma) - 1;
                 /* Assume for now that PAGE_CACHE_SHIFT == PAGE_SHIFT */
                 zba = details->first_index;
                 if (zba < vba)