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

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Message-Id: <20200515131656.12890-30-willy@infradead.org>
Date:   Fri, 15 May 2020 06:16:49 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 29/36] mm: Support retrieving tail pages from the page cache

From: "Matthew Wilcox (Oracle)" <willy@...radead.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) <willy@...radead.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