linux-kernel - [PATCH v4 04/25] Wipe out CFLGS_OFF_SLAB from flags during initial slab creation

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Message-Id: <1340015298-14133-5-git-send-email-glommer@parallels.com>
Date:	Mon, 18 Jun 2012 14:27:57 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	<linux-mm@...ck.org>
Cc:	Pekka Enberg <penberg@...nel.org>, Cristoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	<cgroups@...r.kernel.org>, <devel@...nvz.org>,
	<kamezawa.hiroyu@...fujitsu.com>, <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: [PATCH v4 04/25] Wipe out CFLGS_OFF_SLAB from flags during initial slab creation

CFLGS_OFF_SLAB is not a valid flag to be passed to cache creation.
If we are duplicating a cache - support added in a future patch -
we will rely on the flags it has stored in itself. That may include
CFLGS_OFF_SLAB.

So it is better to clean this flag at cache creation.

CC: Christoph Lameter <cl@...ux.com>
CC: Pekka Enberg <penberg@...helsinki.fi>
CC: David Rientjes <rientjes@...gle.com>
---
 mm/slab.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/slab.c b/mm/slab.c
index 2d5fe28..c30a61c 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2201,6 +2201,12 @@ int __kmem_cache_create(struct kmem_cache *cachep)
 		BUG_ON(flags & SLAB_POISON);
 #endif
 	/*
+	 * Passing this flag at creation time is invalid, but if we're
+	 * duplicating a slab, it may happen.
+	 */
+	flags &= ~CFLGS_OFF_SLAB;
+
+	/*
 	 * Always checks flags, a caller might be expecting debug support which
 	 * isn't available.
 	 */
-- 
1.7.10.2

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