linux-kernel - [PATCH] [12/98] slub: fix panic with DISCONTIGMEM

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Date:	Tue, 26 Jul 2011 17:35:04 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	James.Bottomley@...senPartnership.com, rientjes@...gle.com,
	penberg@...nel.org, James.Bottomley@...e.de, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH] [12/98] slub: fix panic with DISCONTIGMEM

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: James Bottomley <James.Bottomley@...senPartnership.com>

commit 4a5fa3590f09999f6db41bc386bce40848fa9f63 upstream.

Slub makes assumptions about page_to_nid() which are violated by
DISCONTIGMEM and !NUMA.  This violation results in a panic because
page_to_nid() can be non-zero for pages in the discontiguous ranges and
this leads to a null return by get_node().  The assertion by the
maintainer is that DISCONTIGMEM should only be allowed when NUMA is also
defined.  However, at least six architectures: alpha, ia64, m32r, m68k,
mips, parisc violate this.  The panic is a regression against slab, so
just mark slub broken in the problem configuration to prevent users
reporting these panics.

Acked-by: David Rientjes <rientjes@...gle.com>
Acked-by: Pekka Enberg <penberg@...nel.org>
Signed-off-by: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 init/Kconfig |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6.35.y/init/Kconfig
===================================================================
--- linux-2.6.35.y.orig/init/Kconfig
+++ linux-2.6.35.y/init/Kconfig
@@ -1087,6 +1087,7 @@ config SLAB
 	  per cpu and per node queues.

 config SLUB
+	depends on BROKEN || NUMA || !DISCONTIGMEM
 	bool "SLUB (Unqueued Allocator)"
 	help
 	   SLUB is a slab allocator that minimizes cache line usage
--
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