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Subject[PATCH 02/91] slub: fix panic with DISCONTIGMEM
2.6.27-longterm review patch.  If anyone has any objections, please let us know.


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 <>
Acked-by: Pekka Enberg <>
Signed-off-by: James Bottomley <>
Signed-off-by: Greg Kroah-Hartman <>
init/Kconfig | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

Index: longterm-2.6.27/init/Kconfig
--- longterm-2.6.27.orig/init/Kconfig 2012-02-05 22:34:35.012915163 +0100
+++ longterm-2.6.27/init/Kconfig 2012-02-05 22:34:35.225915821 +0100
@@ -747,6 +747,7 @@
a slab allocator.

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

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