Use the more common "#define _GNU_SOURCE" instead of defining it to 1.
This will prevent redefinition warnings when -D_GNU_SOURCE= is set.

Signed-off-by: Edward Liaw <edliaw@google.com>
---
 tools/testing/selftests/mm/thuge-gen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/thuge-gen.c b/tools/testing/selftests/mm/thuge-gen.c
index d50dc71cac32..e4370b79b62f 100644
--- a/tools/testing/selftests/mm/thuge-gen.c
+++ b/tools/testing/selftests/mm/thuge-gen.c
@@ -13,7 +13,7 @@
    sudo ipcs | awk '$1 == "0x00000000" {print $2}' | xargs -n1 sudo ipcrm -m
    (warning this will remove all if someone else uses them) */
 
-#define _GNU_SOURCE 1
+#define _GNU_SOURCE
 #include <sys/mman.h>
 #include <linux/mman.h>
 #include <stdlib.h>
-- 
2.45.2.741.gdbec12cfda-goog