[PATCH 2/3] mm/smaps: Use vma->vm_pgoff directly when counting partial swap

[Peter Xu]

As it's trying to cover the whole vma anyways, use direct vm_pgoff value and
vma_pages() rather than linear_page_index.

Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
 mm/shmem.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 96ccf6e941aa..d2620db8c938 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));
 }
 
 /*
-- 
2.31.1