diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 6b326a9e81914..ed56b2534500a 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -191,7 +191,6 @@ void arch_cpu_finalize_init(void);
 static inline void arch_cpu_finalize_init(void) { }
 #endif
 
-void cpu_set_state_online(int cpu);
 void play_idle_precise(u64 duration_ns, u64 latency_ns);
 
 static inline void play_idle(unsigned long duration_us)