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

Matthew Wilcox
2020-05-15T13:18:00Z

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@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