linux-kernel - [17/43] [PARISC] slub: fix panic with DISCONTIGMEM

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Date:	Thu, 05 May 2011 17:25:38 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	James Bottomley <James.Bottomley@...e.de>
Subject: [17/43] [PARISC] slub: fix panic with DISCONTIGMEM

2.6.33-longterm review patch.  If anyone has any objections, please let us 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>

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

--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1070,6 +1070,7 @@ 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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