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-rw-r--r--tools/testing/selftests/cgroup/test_kmem.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/testing/selftests/cgroup/test_kmem.c b/tools/testing/selftests/cgroup/test_kmem.c
index 2e453ac50c0d..96693d8772be 100644
--- a/tools/testing/selftests/cgroup/test_kmem.c
+++ b/tools/testing/selftests/cgroup/test_kmem.c
@@ -1,4 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+
#include <linux/limits.h>
#include <fcntl.h>
#include <stdio.h>