diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 006f69f9277b..6fb1f807f394 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -217,4 +217,11 @@ static inline bool cpu_mitigations_auto_nosmt(void)
 	return cpu_mitigations == CPU_MITIGATIONS_AUTO_NOSMT;
 }
 
+#define IDLE_START 1
+#define IDLE_END 2
+
+void idle_notifier_register(struct notifier_block *n);
+void idle_notifier_unregister(struct notifier_block *n);
+void idle_notifier_call_chain(unsigned long val);
+
 #endif /* _LINUX_CPU_H_ */
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 6ebbdf5c8bf5..c31b02aae6db 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2306,3 +2306,23 @@ static int __init mitigations_parse_cmdline(char *arg)
 	return 0;
 }
 early_param("mitigations", mitigations_parse_cmdline);
+
+static ATOMIC_NOTIFIER_HEAD(idle_notifier);
+
+void idle_notifier_register(struct notifier_block *n)
+{
+	atomic_notifier_chain_register(&idle_notifier, n);
+}
+EXPORT_SYMBOL_GPL(idle_notifier_register);
+
+void idle_notifier_unregister(struct notifier_block *n)
+{
+	atomic_notifier_chain_unregister(&idle_notifier, n);
+}
+EXPORT_SYMBOL_GPL(idle_notifier_unregister);
+
+void idle_notifier_call_chain(unsigned long val)
+{
+	atomic_notifier_call_chain(&idle_notifier, val, NULL);
+}
+EXPORT_SYMBOL_GPL(idle_notifier_call_chain);