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-rw-r--r--tools/testing/selftests/mm/mdwe_test.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/testing/selftests/mm/mdwe_test.c b/tools/testing/selftests/mm/mdwe_test.c
index 200bedcdc32e9c..1e01d3ddc11c58 100644
--- a/tools/testing/selftests/mm/mdwe_test.c
+++ b/tools/testing/selftests/mm/mdwe_test.c
@@ -7,6 +7,7 @@
#include <linux/mman.h>
#include <linux/prctl.h>
+#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <sys/auxv.h>