diff --git a/kernel/smpboot.c b/kernel/smpboot.c
index e4163042c4d6..21b7953f8242 100644
--- a/kernel/smpboot.c
+++ b/kernel/smpboot.c
@@ -47,7 +47,7 @@ void __init idle_thread_set_boot_cpu(void)
  *
  * Creates the thread if it does not exist.
  */
-static inline void idle_init(unsigned int cpu)
+static inline void __always_inline idle_init(unsigned int cpu)
 {
 	struct task_struct *tsk = per_cpu(idle_threads, cpu);