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selftests: kselftest_harness: fix Clang warning about zero-length format 

Apparently it's more legal to pass the format as NULL, than
it is to use an empty string. Clang complains about empty
formats:

./../kselftest_harness.h:1207:30: warning: format string is empty
[-Wformat-zero-length]
 1207 |            diagnostic ? "%s" : "", diagnostic);
      |                                 ^~
1 warning generated.

Reported-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/all/20240409224256.1581292-1-seanjc@google.com
Fixes: 378193eff3 ("selftests: kselftest_harness: let PASS / FAIL provide diagnostic")
Tested-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Link: https://lore.kernel.org/r/20240416151048.1682352-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-04-16 08:10:48 -07:00
parent 0f022d32c3
commit caed8eba22
2 changed files with 7 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
tools/testing/selftests/kselftest.h
View File

@ -288,15 +288,17 @@ void ksft_test_result_code(int exit_code, const char *test_name,
}
/* Docs seem to call for double space if directive is absent */
if (!directive[0] && msg[0])
if (!directive[0] && msg)
directive = " # ";
va_start(args, msg);
printf("%s %u %s%s", tap_code, ksft_test_num(), test_name, directive);
errno = saved_errno;
vprintf(msg, args);
if (msg) {
va_start(args, msg);
vprintf(msg, args);
va_end(args);
}
printf("\n");
va_end(args);
}
static inline int ksft_exit_pass(void)

2
tools/testing/selftests/kselftest_harness.h
View File

@ -1202,7 +1202,7 @@ void __run_test(struct __fixture_metadata *f,
diagnostic = "unknown";
ksft_test_result_code(t->exit_code, test_name,
diagnostic ? "%s" : "", diagnostic);
diagnostic ? "%s" : NULL, diagnostic);
}
static int test_harness_run(int argc, char **argv)