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-rw-r--r--tools/perf/util/callchain.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 837012147c7b..082505d08d72 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2009-2011, Frederic Weisbecker <fweisbec@gmail.com>
*