[PATCH] ia64: no discontig w/o NUMA

Currently the generic kernel won't build if you turn off NUMA
support.  Seems discontig support is too entangled with NUMA
support to live without it.  This patch makes it behave a bit
more friendly.

arch/ia64/Kconfig

@@ -234,8 +234,8 @@ config IA64_NODESIZE_256GB
 endchoice
 
 config DISCONTIGMEM
-	bool "Discontiguous memory support" if (IA64_DIG && NUMA)
-	default y if IA64_SGI_SN2 || IA64_GENERIC
+	bool "Discontiguous memory support" if (IA64_DIG || IA64_SGI_SN2 || IA64_GENERIC) && NUMA
+	default y if (IA64_SGI_SN2 || IA64_GENERIC) && NUMA
 	help
 	  Say Y to support efficient handling of discontiguous physical memory,
 	  for architectures which are either NUMA (Non-Uniform Memory Access)