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-rw-r--r--tools/testing/selftests/cgroup/cgroup_util.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
index ce16a50ecff8..432db923bced 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.c
+++ b/tools/testing/selftests/cgroup/cgroup_util.c
@@ -1,4 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
+
+#define _GNU_SOURCE
+
#include <errno.h>
#include <fcntl.h>
#include <linux/limits.h>