diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 75ccf5d18bf4e3630e892dd0021a8c890a0fc0c2..d3cc07fa4480fc7e09fda5099af8270cf82c2b49 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -881,8 +881,8 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 	return 0;
 }
 
-static void
-acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
+static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
+						u32 event, void *data)
 {
 	struct acpi_processor *pr;
 	struct acpi_device *device = NULL;