Index: kernel/arch/ia64/include/mm/as.h
===================================================================
--- kernel/arch/ia64/include/mm/as.h	(revision 22f05611fe61be707c3bee218be98f8f16f46f17)
+++ kernel/arch/ia64/include/mm/as.h	(revision 1dbc43f1c037ded959f69e4b6346df8bf12e2431)
@@ -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;