v4.19.13 snapshot.
diff --git a/include/linux/sched/cpufreq.h b/include/linux/sched/cpufreq.h
new file mode 100644
index 0000000..5966744
--- /dev/null
+++ b/include/linux/sched/cpufreq.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_SCHED_CPUFREQ_H
+#define _LINUX_SCHED_CPUFREQ_H
+
+#include <linux/types.h>
+
+/*
+ * Interface between cpufreq drivers and the scheduler:
+ */
+
+#define SCHED_CPUFREQ_IOWAIT (1U << 0)
+#define SCHED_CPUFREQ_MIGRATION (1U << 1)
+
+#ifdef CONFIG_CPU_FREQ
+struct update_util_data {
+ void (*func)(struct update_util_data *data, u64 time, unsigned int flags);
+};
+
+void cpufreq_add_update_util_hook(int cpu, struct update_util_data *data,
+ void (*func)(struct update_util_data *data, u64 time,
+ unsigned int flags));
+void cpufreq_remove_update_util_hook(int cpu);
+#endif /* CONFIG_CPU_FREQ */
+
+#endif /* _LINUX_SCHED_CPUFREQ_H */