| Message ID | 20240416151048.1682352-1-kuba@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [net] selftests: kselftest_harness: fix Clang warning about zero-length format | expand |
On Tue, Apr 16, 2024, Jakub Kicinski wrote: > 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: 378193eff339 ("selftests: kselftest_harness: let PASS / FAIL provide diagnostic") > Signed-off-by: Jakub Kicinski <kuba@kernel.org> Thanks Jakub! Tested-by: Sean Christopherson <seanjc@google.com>
On 4/16/24 8:10 PM, Jakub Kicinski wrote: > 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: 378193eff339 ("selftests: kselftest_harness: let PASS / FAIL provide diagnostic") > Signed-off-by: Jakub Kicinski <kuba@kernel.org> Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com> > --- > --- > CC: shuah@kernel.org > CC: keescook@chromium.org > CC: usama.anjum@collabora.com > CC: linux-kselftest@vger.kernel.org > CC: llvm@lists.linux.dev > --- > tools/testing/selftests/kselftest.h | 10 ++++++---- > tools/testing/selftests/kselftest_harness.h | 2 +- > 2 files changed, 7 insertions(+), 5 deletions(-) > > diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h > index 541bf192e30e..4eca3fd1292c 100644 > --- a/tools/testing/selftests/kselftest.h > +++ b/tools/testing/selftests/kselftest.h > @@ -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) > diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h > index 4fd735e48ee7..adb15cae79ab 100644 > --- a/tools/testing/selftests/kselftest_harness.h > +++ b/tools/testing/selftests/kselftest_harness.h > @@ -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)
Hello: This patch was applied to netdev/net.git (main) by Jakub Kicinski <kuba@kernel.org>: On Tue, 16 Apr 2024 08:10:48 -0700 you wrote: > 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. > > [...] Here is the summary with links: - [net] selftests: kselftest_harness: fix Clang warning about zero-length format https://git.kernel.org/netdev/net/c/caed8eba2215 You are awesome, thank you!
diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h index 541bf192e30e..4eca3fd1292c 100644 --- a/tools/testing/selftests/kselftest.h +++ b/tools/testing/selftests/kselftest.h @@ -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) diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h index 4fd735e48ee7..adb15cae79ab 100644 --- a/tools/testing/selftests/kselftest_harness.h +++ b/tools/testing/selftests/kselftest_harness.h @@ -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)
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: 378193eff339 ("selftests: kselftest_harness: let PASS / FAIL provide diagnostic") Signed-off-by: Jakub Kicinski <kuba@kernel.org> --- --- CC: shuah@kernel.org CC: keescook@chromium.org CC: usama.anjum@collabora.com CC: linux-kselftest@vger.kernel.org CC: llvm@lists.linux.dev --- tools/testing/selftests/kselftest.h | 10 ++++++---- tools/testing/selftests/kselftest_harness.h | 2 +- 2 files changed, 7 insertions(+), 5 deletions(-)