diff --git a/arch/parisc/kernel/drivers.c b/arch/parisc/kernel/drivers.c
index 5eb979d04b90..a1a5e4c59e6b 100644
--- a/arch/parisc/kernel/drivers.c
+++ b/arch/parisc/kernel/drivers.c
@@ -789,7 +789,7 @@ EXPORT_SYMBOL(device_to_hwpath);
 static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
                             struct device *parent);
 
-static void walk_lower_bus(struct parisc_device *dev)
+static void __init walk_lower_bus(struct parisc_device *dev)
 {
 	unsigned long io_io_low, io_io_high;