1 files changed, 1 insertions, 1 deletions

diff --git a/mm/page_io.c b/mm/page_io.c
index 3b97f6850273..065c4480eaf0 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -126,7 +126,7 @@ int swap_readpage(struct file *file, struct page *page)
         int ret = 0;
 
         BUG_ON(!PageLocked(page));
-        ClearPageUptodate(page);
+        BUG_ON(PageUptodate(page));
         bio = get_swap_bio(GFP_KERNEL, page_private(page), page,
                                 end_swap_bio_read);
         if (bio == NULL) {