-void kref_init(struct kref *kref, void (*release)(struct kref *));
-struct kref *kref_get(struct kref *kref);
-void kref_put(struct kref *kref);
-
+void kref_init(struct kref *kref);
+void kref_get(struct kref *kref);
+void kref_put(struct kref *kref, void (*release) (struct kref *kref));