diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 9fa49686957ad..3f34ebb275253 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -460,4 +460,9 @@ static inline void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy)
 }
 #endif	/* CONFIG_CPU_FREQ */
 
+#ifdef CONFIG_ACPI_PROCESSOR_IDLE
+extern int acpi_processor_ffh_lpi_probe(unsigned int cpu);
+extern int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi);
+#endif
+
 #endif