diff --git a/mm/shmem.c b/mm/shmem.c
index b5860f4a2738..7cd976b588ff 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -856,9 +856,8 @@ unsigned long shmem_swap_usage(struct vm_area_struct *vma)
 		return swapped << PAGE_SHIFT;
 
 	/* Here comes the more involved part */
-	return shmem_partial_swap_usage(mapping,
-			linear_page_index(vma, vma->vm_start),
-			linear_page_index(vma, vma->vm_end));
+	return shmem_partial_swap_usage(mapping, vma->vm_pgoff,
+					vma->vm_pgoff + vma_pages(vma));
 }
 
 /*