From: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Date: Sat, 16 Jan 2016 00:51:53 +0000 (-0800)
Subject: page-flags: define PG_mlocked behavior on compound pages
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e4f87d5d752d259b274681420b010c65006301a6;p=linux.git

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
PF_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>
Cc: Jérôme Glisse <jglisse@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 7fc2ea83cbd57..43b7acb092ff5 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -328,8 +328,10 @@ PAGEFLAG(Unevictable, unevictable, PF_HEAD)
 	TESTCLEARFLAG(Unevictable, unevictable, PF_HEAD)
 
 #ifdef CONFIG_MMU
-PAGEFLAG(Mlocked, mlocked, PF_ANY) __CLEARPAGEFLAG(Mlocked, mlocked, PF_ANY)
-	TESTSCFLAG(Mlocked, mlocked, PF_ANY) __TESTCLEARFLAG(Mlocked, mlocked, PF_ANY)
+PAGEFLAG(Mlocked, mlocked, PF_NO_TAIL)
+	__CLEARPAGEFLAG(Mlocked, mlocked, PF_NO_TAIL)
+	TESTSCFLAG(Mlocked, mlocked, PF_NO_TAIL)
+	__TESTCLEARFLAG(Mlocked, mlocked, PF_NO_TAIL)
 #else
 PAGEFLAG_FALSE(Mlocked) __CLEARPAGEFLAG_NOOP(Mlocked)
 	TESTSCFLAG_FALSE(Mlocked) __TESTCLEARFLAG_FALSE(Mlocked)