v4.19.13 snapshot.
diff --git a/arch/sparc/include/asm/stacktrace.h b/arch/sparc/include/asm/stacktrace.h
new file mode 100644
index 0000000..556ec5d
--- /dev/null
+++ b/arch/sparc/include/asm/stacktrace.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SPARC64_STACKTRACE_H
+#define _SPARC64_STACKTRACE_H
+
+void stack_trace_flush(void);
+
+#endif /* _SPARC64_STACKTRACE_H */