v4.19.13 snapshot.
diff --git a/include/linux/decompress/unlzo.h b/include/linux/decompress/unlzo.h
new file mode 100644
index 0000000..550ae87
--- /dev/null
+++ b/include/linux/decompress/unlzo.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef DECOMPRESS_UNLZO_H
+#define DECOMPRESS_UNLZO_H
+
+int unlzo(unsigned char *inbuf, long len,
+ long (*fill)(void*, unsigned long),
+ long (*flush)(void*, unsigned long),
+ unsigned char *output,
+ long *pos,
+ void(*error)(char *x));
+#endif