linux-kernel - [PATCH 11/16] page-flags: define PG_swapcache behavior on compound pages

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Message-Id: <1426784902-125149-12-git-send-email-kirill.shutemov@linux.intel.com>
Date:	Thu, 19 Mar 2015 19:08:17 +0200
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>
Cc:	Dave Hansen <dave.hansen@...el.com>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Steve Capper <steve.capper@...aro.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Jerome Marchand <jmarchan@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 11/16] page-flags: define PG_swapcache behavior on compound pages

Swap cannot handle compound pages so far. Transparent huge pages are
split on the way to swap.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 include/linux/page-flags.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index d1d08508984d..9ea90bb8cb89 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -330,7 +330,7 @@ PAGEFLAG_FALSE(HighMem)
 #endif
 
 #ifdef CONFIG_SWAP
-PAGEFLAG(SwapCache, swapcache, ANY)
+PAGEFLAG(SwapCache, swapcache, NO_COMPOUND)
 #else
 PAGEFLAG_FALSE(SwapCache)
 #endif
-- 
2.1.4

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