Functions definitions without any argument list produce a warning with
-Wold-style-definition:

vdso_test_correctness.c:111:13: warning: old-style function definition [-Wold-style-definition]
  111 | static void fill_function_pointers()
      |             ^~~~~~~~~~~~~~~~~~~~~~

Explicitly use an empty argument list.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 tools/testing/selftests/vDSO/vdso_test_correctness.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/vDSO/vdso_test_correctness.c b/tools/testing/selftests/vDSO/vdso_test_correctness.c
index 5fb97ad67eeaf17b6cfa4f82783c57894f03e5c5..da651cf53c6ca4242085de109c7fc57bd807297c 100644
--- a/tools/testing/selftests/vDSO/vdso_test_correctness.c
+++ b/tools/testing/selftests/vDSO/vdso_test_correctness.c
@@ -108,7 +108,7 @@ static void *vsyscall_getcpu(void)
 }
 
 
-static void fill_function_pointers()
+static void fill_function_pointers(void)
 {
 	void *vdso = dlopen("linux-vdso.so.1",
 			    RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);

-- 
2.49.0

On 5/2/25 5:40 PM, Thomas Weißschuh wrote:
> Functions definitions without any argument list produce a warning with
> -Wold-style-definition:
> 
> vdso_test_correctness.c:111:13: warning: old-style function definition [-Wold-style-definition]
>   111 | static void fill_function_pointers()
>       |             ^~~~~~~~~~~~~~~~~~~~~~
This warning doesn't appear on my side. Are you using extra compiler
flags? If yes, please add them to the Makefile.

> 
> Explicitly use an empty argument list.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> ---
>  tools/testing/selftests/vDSO/vdso_test_correctness.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/vDSO/vdso_test_correctness.c b/tools/testing/selftests/vDSO/vdso_test_correctness.c
> index 5fb97ad67eeaf17b6cfa4f82783c57894f03e5c5..da651cf53c6ca4242085de109c7fc57bd807297c 100644
> --- a/tools/testing/selftests/vDSO/vdso_test_correctness.c
> +++ b/tools/testing/selftests/vDSO/vdso_test_correctness.c
> @@ -108,7 +108,7 @@ static void *vsyscall_getcpu(void)
>  }
>  
>  
> -static void fill_function_pointers()
> +static void fill_function_pointers(void)
>  {
>  	void *vdso = dlopen("linux-vdso.so.1",
>  			    RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
> 


-- 
Regards,
Usama