--- zzzz-none-000/linux-4.4.271/arch/arm64/include/asm/smp_plat.h	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/arch/arm64/include/asm/smp_plat.h	2023-04-19 10:22:27.000000000 +0000
@@ -36,6 +36,8 @@
 	return 1 << mpidr_hash.bits;
 }
 
+extern void secondary_startup(void);
+
 /*
  * Logical CPU mapping.
  */