From: angquan yu <angquan21@gmail.com>

In the function 'tools/testing/selftests/breakpoints/run_test' within
step_after_suspend_test.c, the ksft_print_msg function call incorrectly
used '$s' as a format specifier. This commit corrects this typo to use the
proper '%s' format specifier, ensuring the error message from
waitpid() is correctly displayed.

The issue manifested as a compilation warning (too many arguments
for format [-Wformat-extra-args]), potentially obscuring actual
runtime errors and complicating debugging processes.

This fix enhances the clarity of error messages during test failures
and ensures compliance with standard C format string conventions.

Signed-off-by: angquan yu <angquan21@gmail.com>
---
 tools/testing/selftests/breakpoints/step_after_suspend_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/breakpoints/step_after_suspend_test.c b/tools/testing/selftests/breakpoints/step_after_suspend_test.c
index 2cf6f10ab..b8703c499 100644
--- a/tools/testing/selftests/breakpoints/step_after_suspend_test.c
+++ b/tools/testing/selftests/breakpoints/step_after_suspend_test.c
@@ -89,7 +89,7 @@ int run_test(int cpu)
 
 	wpid = waitpid(pid, &status, __WALL);
 	if (wpid != pid) {
-		ksft_print_msg("waitpid() failed: $s\n", strerror(errno));
+		ksft_print_msg("waitpid() failed: %s\n", strerror(errno));
 		return KSFT_FAIL;
 	}
 	if (WIFEXITED(status)) {
-- 
2.39.2

On 11/28/23 14:48, angquan yu wrote:
> From: angquan yu <angquan21@gmail.com>
> 
> In the function 'tools/testing/selftests/breakpoints/run_test' within
> step_after_suspend_test.c, the ksft_print_msg function call incorrectly
> used '$s' as a format specifier. This commit corrects this typo to use the
> proper '%s' format specifier, ensuring the error message from
> waitpid() is correctly displayed.
> 
> The issue manifested as a compilation warning (too many arguments
> for format [-Wformat-extra-args]), potentially obscuring actual
> runtime errors and complicating debugging processes.
> 
> This fix enhances the clarity of error messages during test failures
> and ensures compliance with standard C format string conventions.
> 
> Signed-off-by: angquan yu <angquan21@gmail.com>

Thank you for the fix. Applied to linux-kselftest next for Linux 6.8-rc1

thanks,
-- Shuah