Index: kernel/arch/ia64/include/mm/as.h
===================================================================
--- kernel/arch/ia64/include/mm/as.h	(revision 100806465eefdbc917d7fcd6da881dc85f5a0c8b)
+++ kernel/arch/ia64/include/mm/as.h	(revision d1e844029e7efa0c93a3a78b306a196e4af6da8f)
@@ -43,6 +43,4 @@
 #define USER_ADDRESS_SPACE_END_ARCH      UINT64_C(0xdfffffffffffffff)
 
-#define USTACK_ADDRESS_ARCH  UINT64_C(0x0000000ff0000000)
-
 typedef struct {
 } as_arch_t;