diff --git a/arch/csky/include/asm/sections.h b/arch/csky/include/asm/sections.h
index 83e82b7c0f6c..ee5cdf226a9b 100644
--- a/arch/csky/include/asm/sections.h
+++ b/arch/csky/include/asm/sections.h
@@ -8,5 +8,6 @@
 extern char _start[];
 
 asmlinkage void csky_start(unsigned int unused, void *dtb_start);
+asmlinkage void csky_start_secondary(void);
 
 #endif /* __ASM_SECTIONS_H */