From f4227914b97bedf3b7eb9f869c9573f9915c905e Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Wed, 8 Apr 2015 09:44:25 +1000
Subject: [PATCH] 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@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 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
-- 
2.39.5