[PATCH v4 29/36] mm: Support retrieving tail pages from the page cache

[Matthew Wilcox]

From: "Matthew Wilcox (Oracle)" <wi...@infradead.org>

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

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

diff --git a/mm/filemap.c b/mm/filemap.c
index 0ec7f25a07b2..56eb086acef8 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1655,7 +1655,7 @@ 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