linux-kernel - [PATCH, RFC 02/10] mm: change PageAnon() to work on tail pages

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Date:	Mon,  9 Jun 2014 19:04:13 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	Hugh Dickins <hughd@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH, RFC 02/10] mm: change PageAnon() to work on tail pages

Current PageAnon() is always return false for tail. We need to look on
head page for correct answer. Let's change the function to give the
right result.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 include/linux/mm.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9f4960bf505b..a60e2db5f9f9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -983,6 +983,7 @@ struct address_space *page_file_mapping(struct page *page)
 
 static inline int PageAnon(struct page *page)
 {
+	page = compound_head(page);
 	return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
 }
 
-- 
2.0.0.rc4

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