v4.19.13 snapshot.
diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h
new file mode 100644
index 0000000..2b70941
--- /dev/null
+++ b/include/linux/arch_topology.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * include/linux/arch_topology.h - arch specific cpu topology information
+ */
+#ifndef _LINUX_ARCH_TOPOLOGY_H_
+#define _LINUX_ARCH_TOPOLOGY_H_
+
+#include <linux/types.h>
+#include <linux/percpu.h>
+
+void topology_normalize_cpu_scale(void);
+
+struct device_node;
+bool topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu);
+
+DECLARE_PER_CPU(unsigned long, cpu_scale);
+
+struct sched_domain;
+static inline
+unsigned long topology_get_cpu_scale(struct sched_domain *sd, int cpu)
+{
+ return per_cpu(cpu_scale, cpu);
+}
+
+void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity);
+
+DECLARE_PER_CPU(unsigned long, freq_scale);
+
+static inline
+unsigned long topology_get_freq_scale(int cpu)
+{
+ return per_cpu(freq_scale, cpu);
+}
+
+#endif /* _LINUX_ARCH_TOPOLOGY_H_ */