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-rw-r--r--include/linux/sonet.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sonet.h b/include/linux/sonet.h
index 680f9a31df25..2b802b6d12ad 100644
--- a/include/linux/sonet.h
+++ b/include/linux/sonet.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
/* sonet.h - SONET/SHD physical layer control */
#ifndef LINUX_SONET_H
#define LINUX_SONET_H