[PATCH v6 44/51] mm: Support retrieving tail pages from the page cache

[Matthew Wilcox]

From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>

page->index is not meaningful for tail pages; we have to use
page_to_index() in this assertion.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 mm/filemap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 17db007f0277..869b970fe1ab 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1652,7 +1652,7 @@ struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index,
 			put_page(page);
 			goto repeat;
 		}
-		VM_BUG_ON_PAGE(page->index != index, page);
+		VM_BUG_ON_PAGE(page_to_index(page) != index, page);
 	}
 
 	if (fgp_flags & FGP_ACCESSED)
-- 
2.26.2