v4.19.13 snapshot.
diff --git a/drivers/base/init.c b/drivers/base/init.c
new file mode 100644
index 0000000..908e652
--- /dev/null
+++ b/drivers/base/init.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2002-3 Patrick Mochel
+ * Copyright (c) 2002-3 Open Source Development Labs
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/memory.h>
+#include <linux/of.h>
+
+#include "base.h"
+
+/**
+ * driver_init - initialize driver model.
+ *
+ * Call the driver model init functions to initialize their
+ * subsystems. Called early from init/main.c.
+ */
+void __init driver_init(void)
+{
+ /* These are the core pieces */
+ devtmpfs_init();
+ devices_init();
+ buses_init();
+ classes_init();
+ firmware_init();
+ hypervisor_init();
+
+ /* These are also core pieces, but must come after the
+ * core core pieces.
+ */
+ of_core_init();
+ platform_bus_init();
+ cpu_dev_init();
+ memory_dev_init();
+ container_dev_init();
+}