diff --git a/arch/sparc/mm/swift.S b/arch/sparc/mm/swift.S
index 5d2b88d..f414bfd 100644
--- a/arch/sparc/mm/swift.S
+++ b/arch/sparc/mm/swift.S
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * swift.S: MicroSparc-II mmu/cache operations.
  *