Index: linux-2.6.21-rc5-mm3/arch/x86_64/Kconfig
===================================================================
--- linux-2.6.21-rc5-mm3.orig/arch/x86_64/Kconfig	2007-04-02 13:16:08.000000000 -0700
+++ linux-2.6.21-rc5-mm3/arch/x86_64/Kconfig	2007-04-02 13:16:20.000000000 -0700
@@ -395,9 +395,6 @@
 config SPARSE_VIRTUAL
 	def_bool y
 
-config ARCH_SUPPORTS_PMD_MAPPING
-	def_bool y
-
 config ARCH_MEMORY_PROBE
 	def_bool y
 	depends on MEMORY_HOTPLUG