linux-kernel - [PATCH 2/3] slub: record page flag overlays explicitly

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Date:	Thu, 15 May 2008 18:19:59 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	linux-mm@...ck.org
Cc:	Andrew Morton <akpm@...l.org>,
	Christoph Lameter <clameter@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] slub: record page flag overlays explicitly


SLUB reuses two page bits for internal purposes, it overlays PG_active
and PG_error.  This is hidden away in slub.c.  Document these overlays
explicitly in the main page-flags enum along with all the others.

Signed-off-by: Andy Whitcroft <apw@...dowen.org>
---
 include/linux/page-flags.h |    4 ++++
 mm/slub.c                  |    4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 2cc1fb1..2e88df6 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -103,6 +103,10 @@ enum pageflags {
 
 	/* XEN */
 	PG_pinned = PG_owner_priv_1,
+
+	/* SLUB */
+	PG_slub_frozen = PG_active,
+	PG_slub_debug = PG_error,
 };
 
 #ifndef __GENERATING_BOUNDS_H
diff --git a/mm/slub.c b/mm/slub.c
index a505a82..fd7c61a 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -102,10 +102,10 @@
  * 			the fast path and disables lockless freelists.
  */
 
-#define FROZEN (1 << PG_active)
+#define FROZEN (1 << PG_slub_frozen)
 
 #ifdef CONFIG_SLUB_DEBUG
-#define SLABDEBUG (1 << PG_error)
+#define SLABDEBUG (1 << PG_slub_debug)
 #else
 #define SLABDEBUG 0
 #endif
--
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