-D_GNU_SOURCE= will be provided by lib.mk CFLAGS, so -D_GNU_SOURCE
should be dropped to prevent redefinition warnings.

Signed-off-by: Edward Liaw <edliaw@google.com>
---
 tools/testing/selftests/ring-buffer/Makefile | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tools/testing/selftests/ring-buffer/Makefile b/tools/testing/selftests/ring-buffer/Makefile
index 627c5fa6d1ab..23605782639e 100644
--- a/tools/testing/selftests/ring-buffer/Makefile
+++ b/tools/testing/selftests/ring-buffer/Makefile
@@ -1,7 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 CFLAGS += -Wl,-no-as-needed -Wall
 CFLAGS += $(KHDR_INCLUDES)
-CFLAGS += -D_GNU_SOURCE
 
 TEST_GEN_PROGS = map_test
 
-- 
2.45.2.741.gdbec12cfda-goog