Index: kernel/arch/ia64/include/arch/stack.h
===================================================================
--- kernel/arch/ia64/include/arch/stack.h	(revision 850235d404a93a3e011befe27ef139ef8e288759)
+++ kernel/arch/ia64/include/arch/stack.h	(revision b4df8db46336b1d3a612064e87644b1698115b9c)
@@ -36,4 +36,8 @@
 #define KERN_ia64_STACK_H_
 
+#include <config.h>
+
+#define MEM_STACK_SIZE	(STACK_SIZE / 2)
+
 #define STACK_ITEM_SIZE			8
 #define STACK_ALIGNMENT			16