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-rw-r--r--arch/sandbox/include/asm/io.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/sandbox/include/asm/io.h b/arch/sandbox/include/asm/io.h
index 3e5c0580bc..71cf50cd9a 100644
--- a/arch/sandbox/include/asm/io.h
+++ b/arch/sandbox/include/asm/io.h
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
#ifndef __ASM_SANDBOX_IO_H
#define __ASM_SANDBOX_IO_H