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Subject[36/55] [PARISC] slub: fix panic with DISCONTIGMEM
2.6.38-stable review patch.  If anyone has any objections, please let us know.

From: James Bottomley <>

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 file changed, 1 insertion(+)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1209,6 +1209,7 @@ config SLAB
per cpu and per node queues.

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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