diff -r ecb8ff1fcf1f linux-2.6-xen-sparse/arch/x86_64/Kconfig
--- a/linux-2.6-xen-sparse/arch/x86_64/Kconfig	Fri Jul 14 18:53:27 2006 +0100
+++ b/linux-2.6-xen-sparse/arch/x86_64/Kconfig	Wed Jul 19 11:28:59 2006 +0100
@@ -330,7 +330,7 @@ config ARCH_DISCONTIGMEM_DEFAULT
 
 config ARCH_SPARSEMEM_ENABLE
 	def_bool y
-	depends on (NUMA || EXPERIMENTAL)
+	depends on (NUMA || EXPERIMENTAL) && !X86_64_XEN
 
 config ARCH_MEMORY_PROBE
 	def_bool y