v4.19.13 snapshot.
diff --git a/include/linux/nvram.h b/include/linux/nvram.h
new file mode 100644
index 0000000..28bfb9a
--- /dev/null
+++ b/include/linux/nvram.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_NVRAM_H
+#define _LINUX_NVRAM_H
+
+#include <uapi/linux/nvram.h>
+
+/* __foo is foo without grabbing the rtc_lock - get it yourself */
+extern unsigned char __nvram_read_byte(int i);
+extern unsigned char nvram_read_byte(int i);
+extern void __nvram_write_byte(unsigned char c, int i);
+extern void nvram_write_byte(unsigned char c, int i);
+extern int __nvram_check_checksum(void);
+extern int nvram_check_checksum(void);
+#endif /* _LINUX_NVRAM_H */