diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 3f34ebb27525..94181fe9780a 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -465,4 +465,9 @@ extern int acpi_processor_ffh_lpi_probe(unsigned int cpu);
 extern int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi);
 #endif
 
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+extern int arch_register_cpu(int cpu);
+extern void arch_unregister_cpu(int cpu);
+#endif
+
 #endif