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-rw-r--r--tools/perf/tests/backward-ring-buffer.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/tests/backward-ring-buffer.c b/tools/perf/tests/backward-ring-buffer.c
index d233ad336463..71b9a0b613d2 100644
--- a/tools/perf/tests/backward-ring-buffer.c
+++ b/tools/perf/tests/backward-ring-buffer.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Test backward bit in event attribute, read ring buffer from end to
* beginning