diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c
index b4f134e8bbd9764b9b31d5f092d7813bd55746dc..07e97f289c5207389ffb817330e5d66a4beb6e70 100644
--- a/arch/powerpc/kernel/stacktrace.c
+++ b/arch/powerpc/kernel/stacktrace.c
@@ -1,13 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+
 /*
- * Stack trace utility
+ * Stack trace utility functions etc.
  *
  * Copyright 2008 Christoph Hellwig, IBM Corp.
  * Copyright 2018 SUSE Linux GmbH
- *
- *      This program is free software; you can redistribute it and/or
- *      modify it under the terms of the GNU General Public License
- *      as published by the Free Software Foundation; either version
- *      2 of the License, or (at your option) any later version.
+ * Copyright 2018 Nick Piggin, Michael Ellerman, IBM Corp.
  */
 
 #include <linux/export.h>