--- zzzz-none-000/linux-4.4.60/arch/ia64/kernel/init_task.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/arch/ia64/kernel/init_task.c	2021-02-04 17:41:59.000000000 +0000
@@ -26,6 +26,7 @@
  * handled. This is done by having a special ".data..init_task" section...
  */
 #define init_thread_info	init_task_mem.s.thread_info
+#define init_stack		init_task_mem.stack
 
 union {
 	struct {