diff -drupN a/include/linux/mpp.h b/include/linux/mpp.h
--- a/include/linux/mpp.h	1970-01-01 03:00:00.000000000 +0300
+++ b/include/linux/mpp.h	2022-06-12 05:28:14.000000000 +0300
@@ -0,0 +1,23 @@
+/*
+ *  mpp.h - mpp debug file system
+ *
+ *  Copyright (C) 2017 yanggq <yanggq@allwinnertech.com>
+ *  Copyright (C) 2017 Allwinnertech.
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License version
+ *	2 as published by the Free Software Foundation.
+ *
+ *  mpp is for people to use instead of /proc or /sys.
+ */
+
+#ifndef _MPP_H_
+#define _MPP_H_
+
+#include <linux/fs.h>
+#include <linux/seq_file.h>
+#include <linux/types.h>
+
+extern struct dentry *debugfs_mpp_root;
+
+#endif