linux-kernel - [PATCH 10/16] page-flags: define PG_swapbacked behavior on compound pages

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Date:	Thu, 19 Mar 2015 19:08:16 +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 10/16] page-flags: define PG_swapbacked behavior on compound pages

PG_swapbacked is used for transparent huge pages. For head pages only.
Let's use NO_TAIL policy.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 include/linux/page-flags.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index be691551896b..d1d08508984d 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -290,9 +290,9 @@ PAGEFLAG(Foreign, foreign, NO_COMPOUND)
 
 PAGEFLAG(Reserved, reserved, NO_COMPOUND)
 	__CLEARPAGEFLAG(Reserved, reserved, NO_COMPOUND)
-PAGEFLAG(SwapBacked, swapbacked, ANY)
-	__CLEARPAGEFLAG(SwapBacked, swapbacked, ANY)
-	__SETPAGEFLAG(SwapBacked, swapbacked, ANY)
+PAGEFLAG(SwapBacked, swapbacked, NO_TAIL)
+	__CLEARPAGEFLAG(SwapBacked, swapbacked, NO_TAIL)
+	__SETPAGEFLAG(SwapBacked, swapbacked, NO_TAIL)
 
 /*
  * Private page markings that may be used by the filesystem that owns the page
-- 
2.1.4

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