[PATCH 1/2] selftests/mlock2: Add missing #define _GNU_SOURCE

[Geert Uytterhoeven]

On glibc 2.3.6:

    mlock2-tests.c: In function 'seek_to_smaps_entry':
    mlock2-tests.c:158: warning: implicit declaration of function 'getline'

According to the manpage of getline(), it needs _GNU_SOURCE before glibc
2.10.

Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
 tools/testing/selftests/vm/mlock2-tests.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/vm/mlock2-tests.c b/tools/testing/selftests/vm/mlock2-tests.c
index 4431994aade2ef6f..cb247219f1f72889 100644
--- a/tools/testing/selftests/vm/mlock2-tests.c
+++ b/tools/testing/selftests/vm/mlock2-tests.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <sys/mman.h>
 #include <stdint.h>
 #include <stdio.h>
-- 
1.9.1

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