From eb91858b851f1860ef2338b7d86f2be1bb9f8735 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_mlocked behavior on compound pages

Transparent huge pages can be mlocked -- whole compund page at once.
Something went wrong if we're trying to mlock() tail page.
Let's use NO_TAIL.

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 | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 9ea90bb8cb89..a1ecec3f505f 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -340,8 +340,9 @@ PAGEFLAG(Unevictable, unevictable, HEAD)
 	TESTCLEARFLAG(Unevictable, unevictable, HEAD)
 
 #ifdef CONFIG_MMU
-PAGEFLAG(Mlocked, mlocked, ANY) __CLEARPAGEFLAG(Mlocked, mlocked, ANY)
-	TESTSCFLAG(Mlocked, mlocked, ANY) __TESTCLEARFLAG(Mlocked, mlocked, ANY)
+PAGEFLAG(Mlocked, mlocked, NO_TAIL) __CLEARPAGEFLAG(Mlocked, mlocked, NO_TAIL)
+	TESTSCFLAG(Mlocked, mlocked, NO_TAIL)
+	__TESTCLEARFLAG(Mlocked, mlocked, NO_TAIL)
 #else
 PAGEFLAG_FALSE(Mlocked) __CLEARPAGEFLAG_NOOP(Mlocked)
 	TESTSCFLAG_FALSE(Mlocked) __TESTCLEARFLAG_FALSE(Mlocked)
-- 
2.39.5