v4.19.13 snapshot.
diff --git a/arch/sparc/include/asm/memctrl.h b/arch/sparc/include/asm/memctrl.h
new file mode 100644
index 0000000..6790ed6
--- /dev/null
+++ b/arch/sparc/include/asm/memctrl.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SPARC_MEMCTRL_H
+#define _SPARC_MEMCTRL_H
+
+typedef int (*dimm_printer_t)(int synd_code, unsigned long paddr, char *buf, int buflen);
+
+int register_dimm_printer(dimm_printer_t func);
+void unregister_dimm_printer(dimm_printer_t func);
+
+#endif /* _SPARC_MEMCTRL_H */