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Wed, 05 Mar 2025 01:47:19 -0800 (PST) Date: Wed, 5 Mar 2025 10:47:17 +0100 From: Petr Mladek To: Tamir Duberstein Cc: kernel test robot , David Gow , Steven Rostedt , Andy Shevchenko , Rasmus Villemoes , Sergey Senozhatsky , Andrew Morton , Shuah Khan , oe-kbuild-all@lists.linux.dev, Linux Memory Management List , Geert Uytterhoeven , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v8 3/4] scanf: convert self-test to KUnit Message-ID: References: <20250214-scanf-kunit-convert-v8-3-5ea50f95f83c@gmail.com> <202502160245.KUrryBJR-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Queue-Id: AC4031C000A X-Stat-Signature: 7x3c7kh17fihf37774knkcref9x43336 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1741168041-985424 X-HE-Meta: U2FsdGVkX18bm1BdcVulE0x5InmyHYSHN+Kn8uqV6/bdF5gB9VdW4jZTvol9WwKyDhlAqaQnwf891A7QMwr2k7gbs8hTqh0Xck4kctYxsydnsJps8tHGTPEth05faVeAE/62EhzIrxG57iGaisqNZILgHbwIYF1ZInaav7YjOjODnaIVNZGKHYGIhz8ilR04Nq0JFooi+fPVSlRjLbzHQs+zz5hSxeSAwpI5Oj2lKQ5BFvwdlvhn7dlaZfLgqEsj5wB25cSLkB7Fzkv1tYg/QzL8O9Vjdg+Glm5dmlMLmCrRxQv44E4khpDQnMEkqZE3bs77f3O6PLgAoXWFfM17aoMyE44ocA3FVJaxklcrXA5dSqHcJyPCnAnEfZClfadKScaSc0yRmek3nf8J/kKaXVhbZmk3wisxPejbY/1NW9sdEt7wgllCN7HJLO7oQ2O5nCrzOopS26I6X0FKsgrtV8he3RvH574APln9PJmFRbID2Ftuix5AwOwk6yX/Fb+Tqfv98Yr9rsoNOFoP563cl2D3DfhA92FDVATn3hUPQ22U+Wk4lzoXZUp2tLALWWkY54O7C8+fyTWfjXX0zeEdRE01QiZeqrLVCqEzfB8QMTkstt8ER3g2qZWnYKt3q0MOoggcV8eVoMjyLjoFrzVqGQPUNuKkUI9O3vVHvoqafGKnxrnB1LDG3nWGjvwq+GInZBj2jOLHaGfmlQ/W97F8S6gWtuYy0x4Zp0Z5hNY5k20rupvzABVWDy3akK0gY8Xes4seYmstO2ZbHIJqi7XINVfzcmtm2jmr01pcJGlWLwVUMdgqJ3y7FMVb7LcGB5De6ia1vhoxKY4vDp5p2Mcwmc6oTvskuVUsgzzgsDynOQOLKwNF/H7kK1bfa/mFn0bmNHGqVhURf1G8xDwcz8Bw13TQKpEHlApATGD9a7wMBaktUZwD/+MyWToxo/3U/SHQzEqeTzEk/+Lu5ic6jEl nP6lpCia 4Jm14xFKMiIQmAUY/VueldN1LAaTX3i6+rNoXnSyk6tpc74zJGG1P7bqmX68n/GFi9eeMVI8ndH8ZdOmEgUuIr4i6aei7eXsnCA7EUq2sBmRX3mu6UJsVXWXnspEZ4nFhKFyPWOFWaDboNP6EVV+6Vst8kkhEqip9JK8KPWl995p/NpgDkGYOUbMQYb7ncYVLIQ3rRGZbP6dZ3zeDMhevMDhAa0CczSKi7b8InjOc20Sy1ZB5TjdvqRs3USijdSzIS4A8ib6ZAuu8ozwjeP9iu0ZK1+HMM6e5NKzGl59Q2qD2DODnZjOjPlDFl8Wj2oEcq9iduCnqWThoGlrLomw2MPi0KTlJucb4mJLz+x+On3tNBCtmxbi5GQ4bU2tg0KlWag1Ji/jJUqpjU5uNnjE1AT7jEs+VqkF/7Qd979KmCYPAyIiQoUNykfrA4m1RGqaYAXVT X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat 2025-02-15 14:52:22, Tamir Duberstein wrote: > On Sat, Feb 15, 2025 at 1:51 PM kernel test robot wrote: > > > > Hi Tamir, > > > > kernel test robot noticed the following build warnings: > > > > [auto build test WARNING on 7b7a883c7f4de1ee5040bd1c32aabaafde54d209] > > > > url: > https://github.com/intel-lab-lkp/linux/commits/Tamir-Duberstein/scanf-implicate-test-line-in-failure-messages/20250215-002302 > > base: 7b7a883c7f4de1ee5040bd1c32aabaafde54d209 > > patch link: > https://lore.kernel.org/r/20250214-scanf-kunit-convert-v8-3-5ea50f95f83c%40gmail.com > > patch subject: [PATCH v8 3/4] scanf: convert self-test to KUnit > > config: sh-randconfig-002-20250216 ( > https://download.01.org/0day-ci/archive/20250216/202502160245.KUrryBJR-lkp@intel.com/config > ) > > compiler: sh4-linux-gcc (GCC) 14.2.0 > > reproduce (this is a W=1 build): ( > https://download.01.org/0day-ci/archive/20250216/202502160245.KUrryBJR-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 > > | Closes: > https://lore.kernel.org/oe-kbuild-all/202502160245.KUrryBJR-lkp@intel.com/ > > > > All warnings (new ones prefixed by >>): > > > > In file included from : > > lib/tests/scanf_kunit.c: In function 'numbers_list_ll': > > >> include/linux/compiler.h:197:61: warning: function 'numbers_list_ll' > might be a candidate for 'gnu_scanf' format attribute > [-Wsuggest-attribute=format] > > I am not able to reproduce these warnings with clang 19.1.7. They also > don't obviously make sense to me. I have reproduced the problem with gcc: $> gcc --version gcc (SUSE Linux) 14.2.1 20250220 [revision 9ffecde121af883b60bbe60d00425036bc873048] $> make W=1 lib/test_scanf.ko CALL scripts/checksyscalls.sh DESCEND objtool INSTALL libsubcmd_headers CC [M] lib/test_scanf.o In file included from : lib/test_scanf.c: In function ‘numbers_list_ll’: ./include/linux/compiler.h:197:61: warning: function ‘numbers_list_ll’ might be a candidate for ‘gnu_scanf’ format attribute [-Wsuggest-attribute=format] 197 | #define __BUILD_BUG_ON_ZERO_MSG(e, msg) ((int)sizeof(struct {_Static_assert(!(e), msg);})) | ^ [...] It seems that it is a regression introduced by the first patch of this patch set. And the fix is: diff --git a/lib/test_scanf.c b/lib/test_scanf.c index d1664e0d0138..e65b10c3dc11 100644 --- a/lib/test_scanf.c +++ b/lib/test_scanf.c @@ -27,7 +27,7 @@ static struct rnd_state rnd_state __initdata; typedef int (*check_fn)(const char *file, const int line, const void *check_data, const char *string, const char *fmt, int n_args, va_list ap); -static void __scanf(6, 0) __init +static void __scanf(6, 8) __init _test(const char *file, const int line, check_fn fn, const void *check_data, const char *string, const char *fmt, int n_args, ...) { Best Regards, Petr