v4.19.13 snapshot.
diff --git a/include/linux/usb/functionfs.h b/include/linux/usb/functionfs.h
new file mode 100644
index 0000000..570578c
--- /dev/null
+++ b/include/linux/usb/functionfs.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_FUNCTIONFS_H__
+#define __LINUX_FUNCTIONFS_H__ 1
+
+#include <uapi/linux/usb/functionfs.h>
+
+#endif