proper prototype for acpi_processor_tstate_has_changed()

This patch adds a proper prototype for acpi_processor_tstate_has_changed()
in include/acpi/processor.h

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 386e5aa..9dd0fa9 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -86,7 +86,6 @@
 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
 static int acpi_processor_handle_eject(struct acpi_processor *pr);
-extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
 
 
 static const struct acpi_device_id processor_device_ids[] = {
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 06480bc..06ebb6e 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -319,6 +319,7 @@
 #endif				/* CONFIG_CPU_FREQ */
 
 /* in processor_throttling.c */
+int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
 int acpi_processor_get_throttling_info(struct acpi_processor *pr);
 extern int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
 extern struct file_operations acpi_processor_throttling_fops;