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-rw-r--r--tools/testing/selftests/cgroup/test_core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/testing/selftests/cgroup/test_core.c b/tools/testing/selftests/cgroup/test_core.c
index de8baad46022..a5672a91d273 100644
--- a/tools/testing/selftests/cgroup/test_core.c
+++ b/tools/testing/selftests/cgroup/test_core.c
@@ -1,4 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0 */
+
+#define _GNU_SOURCE
#include <linux/limits.h>
#include <linux/sched.h>
#include <sys/types.h>