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Date:   Sat, 18 Nov 2023 20:57:31 -0600
From:   angquan yu <>
        angquan yu <>
Subject: [PATCH] [PATCH,breakpoints] selftests/breakpoints: Fix format specifier in ksft_print_msg in step_after_suspend_test.c

From: angquan yu <>

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 <>
 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)) {

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