diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index e2121099f03b..29f65bce55e1 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -1033,7 +1033,9 @@ static ssize_t __ref rescan_store(struct sysdev_class *class,
 static SYSDEV_CLASS_ATTR(rescan, 0200, NULL, rescan_store);
 #endif /* CONFIG_HOTPLUG_CPU */
 
-static ssize_t dispatching_show(struct sysdev_class *class, char *buf)
+static ssize_t dispatching_show(struct sysdev_class *class,
+				struct sysdev_class_attribute *attr,
+				char *buf)
 {
 	ssize_t count;