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Tue, 19 Apr 2022 01:12:08 +0000 Date: Tue, 19 Apr 2022 09:11:53 +0800 From: kernel test robot To: Ingo Molnar Cc: llvm@lists.linux.dev, kbuild-all@lists.01.org, linux-kernel@vger.kernel.org Subject: [mingo-tip:sched/headers 2010/2356] kernel/trace/trace_hwlat.c:174:6: warning: no previous prototype for function 'trace_hwlat_callback' Message-ID: <202204190949.0dYaK59p-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org tree: git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers head: af93551cf39027d176f30b9beafc60a4c130998a commit: 5fee58017c43400c6eb3db270e91501a39fd1a4e [2010/2356] headers/deps: Remove inclusions from headers that don't need it anymore config: x86_64-randconfig-a016-20220418 (https://download.01.org/0day-ci/archive/20220419/202204190949.0dYaK59p-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 429cbac0390654f90bba18a41799464adf31a5ec) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=5fee58017c43400c6eb3db270e91501a39fd1a4e git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git git fetch --no-tags mingo-tip sched/headers git checkout 5fee58017c43400c6eb3db270e91501a39fd1a4e # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/trace/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> kernel/trace/trace_hwlat.c:174:6: warning: no previous prototype for function 'trace_hwlat_callback' [-Wmissing-prototypes] void trace_hwlat_callback(bool enter) ^ kernel/trace/trace_hwlat.c:174:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void trace_hwlat_callback(bool enter) ^ static 1 warning generated. vim +/trace_hwlat_callback +174 kernel/trace/trace_hwlat.c e7c15cd8a11333 Steven Rostedt (Red Hat 2016-06-23 173) 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 @174) void trace_hwlat_callback(bool enter) 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 175) { f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 176 struct hwlat_kthread_data *kdata = get_cpu_data(); f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 177 f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 178 if (!kdata->kthread) 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 179) return; 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 180) 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 181) /* 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 182) * Currently trace_clock_local() calls sched_clock() and the 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 183) * generic version is not NMI safe. 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 184) */ 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 185) if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) { 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 186) if (enter) f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 187 kdata->nmi_ts_start = time_get(); 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 188) else f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 189 kdata->nmi_total_ts += time_get() - kdata->nmi_ts_start; 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 190) } 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 191) 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 192) if (enter) f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 193 kdata->nmi_count++; 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 194) } 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 195) :::::: The code at line 174 was first introduced by commit :::::: 7b2c86250122de316cbab8754050622ead04af39 tracing: Add NMI tracing in hwlat detector :::::: TO: Steven Rostedt (Red Hat) :::::: CC: Steven Rostedt -- 0-DAY CI Kernel Test Service https://01.org/lkp