[PATCH v4 6/6] selftests/resctrl: Add missing SPDX license to Makefile

[Shaopeng Tan <tan.shaopeng@xxxxxxxxxxxxxx>]

Add the missing SPDX(SPDX-License-Identifier) license header to
tools/testing/selftests/resctrl/Makefile.

Signed-off-by: Shaopeng Tan <tan.shaopeng@xxxxxxxxxxxxxx>
---
 tools/testing/selftests/resctrl/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/resctrl/Makefile b/tools/testing/selftests/resctrl/Makefile
index 30af27b07d21..71e80bb19dd6 100644
--- a/tools/testing/selftests/resctrl/Makefile
+++ b/tools/testing/selftests/resctrl/Makefile
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
 TEST_GEN_PROGS := resctrl_tests
 
 include ../lib.mk
-- 
2.27.0