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Date: Wed, 17 Apr 2024 11:05:34 +0800
From: kernel test robot <yujie.liu@intel.com>
To: Jakub Kicinski <kuba@kernel.org>
CC: <oe-kbuild-all@lists.linux.dev>, <linux-kernel@vger.kernel.org>, Kees Cook
	<keescook@chromium.org>
Subject: ./../kselftest_harness.h:1152:30: error: format string is empty
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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   96fca68c4fbf77a8185eb10f7557e23352732ea2
commit: 378193eff3399acb8529d0b553709e8f91d34fe3 selftests: kselftest_harness: let PASS / FAIL provide diagnostic
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240417/202404170611.Kkkdkvdy-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <yujie.liu@intel.com>
| Closes: https://lore.kernel.org/r/202404170611.Kkkdkvdy-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from hid_bpf.c:5:
>> ./../kselftest_harness.h:1152:30: error: format string is empty [-Werror,-Wformat-zero-length]
    1152 |                               diagnostic ? "%s" : "", diagnostic);
         |                                                   ^~
   1 error generated.


vim +1152 tools/testing/selftests/hid/./../kselftest_harness.h

65177e47d3035c tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2023-01-25  1108  
142aca6b388c8a tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2020-04-27  1109  void __run_test(struct __fixture_metadata *f,
74bc7c97fa88ae tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2020-04-27  1110  		struct __fixture_variant_metadata *variant,
142aca6b388c8a tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2020-04-27  1111  		struct __test_metadata *t)
f46f576280595f tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-03-13  1112  {
38c957f0703827 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1113  	char test_name[LINE_MAX];
fa1a53d83674b3 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1114  	const char *diagnostic;
38c957f0703827 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1115  
74bc7c97fa88ae tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2020-04-27  1116  	/* reset test struct */
69fe8ec4f673b5 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1117  	t->exit_code = KSFT_PASS;
f46f576280595f tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-03-13  1118  	t->trigger = 0;
0ef67a888375b0 tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-06-22  1119  	memset(t->results->reason, 0, sizeof(t->results->reason));
74bc7c97fa88ae tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2020-04-27  1120  
38c957f0703827 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1121  	snprintf(test_name, sizeof(test_name), "%s%s%s.%s",
74bc7c97fa88ae tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2020-04-27  1122  		 f->name, variant->name[0] ? "." : "", variant->name, t->name);
c8bd596f9388bc tools/testing/selftests/kselftest_harness.h    Michael Ellerman 2020-09-17  1123  
38c957f0703827 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1124  	ksft_print_msg(" RUN           %s ...\n", test_name);
38c957f0703827 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1125  
c8bd596f9388bc tools/testing/selftests/kselftest_harness.h    Michael Ellerman 2020-09-17  1126  	/* Make sure output buffers are flushed before fork */
c8bd596f9388bc tools/testing/selftests/kselftest_harness.h    Michael Ellerman 2020-09-17  1127  	fflush(stdout);
c8bd596f9388bc tools/testing/selftests/kselftest_harness.h    Michael Ellerman 2020-09-17  1128  	fflush(stderr);
c8bd596f9388bc tools/testing/selftests/kselftest_harness.h    Michael Ellerman 2020-09-17  1129  
f46f576280595f tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-03-13  1130  	t->pid = fork();
f46f576280595f tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-03-13  1131  	if (t->pid < 0) {
e80068be21824e tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-06-22  1132  		ksft_print_msg("ERROR SPAWNING TEST CHILD\n");
69fe8ec4f673b5 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1133  		t->exit_code = KSFT_FAIL;
f46f576280595f tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-03-13  1134  	} else if (t->pid == 0) {
92d25637a3a459 tools/testing/selftests/kselftest_harness.h    Li Zhijian       2021-12-17  1135  		setpgrp();
74bc7c97fa88ae tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2020-04-27  1136  		t->fn(t, variant);
796a344fa4315f tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1137  		_exit(t->exit_code);
f46f576280595f tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-03-13  1138  	} else {
f46f576280595f tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-03-13  1139  		__wait_for_test(t);
f46f576280595f tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-03-13  1140  	}
38c957f0703827 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1141  	ksft_print_msg("         %4s  %s\n",
69fe8ec4f673b5 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1142  		       __test_passed(t) ? "OK" : "FAIL", test_name);
9847d24af95c7f tools/testing/selftests/kselftest_harness.h    Kees Cook        2020-06-22  1143  
fa1a53d83674b3 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1144  	if (t->results->reason[0])
fa1a53d83674b3 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1145  		diagnostic = t->results->reason;
378193eff3399a tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1146  	else if (t->exit_code == KSFT_PASS || t->exit_code == KSFT_FAIL)
378193eff3399a tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1147  		diagnostic = NULL;
fa1a53d83674b3 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1148  	else
fa1a53d83674b3 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1149  		diagnostic = "unknown";
fa1a53d83674b3 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1150  
732e2035280bf4 tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28  1151  	ksft_test_result_code(t->exit_code, test_name,
378193eff3399a tools/testing/selftests/kselftest_harness.h    Jakub Kicinski   2024-02-28 @1152  			      diagnostic ? "%s" : "", diagnostic);
c99ee51a9d9716 tools/testing/selftests/seccomp/test_harness.h Kees Cook        2015-06-16  1153  }
c99ee51a9d9716 tools/testing/selftests/seccomp/test_harness.h Kees Cook        2015-06-16  1154  

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https://github.com/intel/lkp-tests/wiki