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Thu, 21 Apr 2022 14:37:20 +0000 Date: Thu, 21 Apr 2022 22:37:08 +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 2150/2579] kernel/trace/trace_hwlat.c:175:6: warning: no previous prototype for function 'trace_hwlat_callback' Message-ID: <202204212231.wBlI8L8G-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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: 49e1ec6c70a6eb4b7de9250a455b8b63eb42afbe commit: b0a0ce86322929677661f28bec305c68815c387d [2150/2579] headers/deps: Remove inclusions from headers that don't need it anymore config: i386-randconfig-a013 (https://download.01.org/0day-ci/archive/20220421/202204212231.wBlI8L8G-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project bac6cd5bf85669e3376610cfc4c4f9ca015e7b9b) 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=b0a0ce86322929677661f28bec305c68815c387d 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 b0a0ce86322929677661f28bec305c68815c387d # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/crypto/ arch/x86/entry/vdso/ arch/x86/events/amd/ arch/x86/kernel/ arch/x86/pci/ kernel/bpf/ 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:175:6: warning: no previous prototype for function 'trace_hwlat_callback' [-Wmissing-prototypes] void trace_hwlat_callback(bool enter) ^ kernel/trace/trace_hwlat.c:175:1: 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 +175 kernel/trace/trace_hwlat.c e7c15cd8a11333 Steven Rostedt (Red Hat 2016-06-23 174) 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 @175) void trace_hwlat_callback(bool enter) 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 176) { f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 177 struct hwlat_kthread_data *kdata = get_cpu_data(); f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 178 f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 179 if (!kdata->kthread) 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 180) return; 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 181) 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 182) /* 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 183) * Currently trace_clock_local() calls sched_clock() and the 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 184) * generic version is not NMI safe. 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 185) */ 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 186) if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) { 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 187) if (enter) f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 188 kdata->nmi_ts_start = time_get(); 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 189) else f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 190 kdata->nmi_total_ts += time_get() - kdata->nmi_ts_start; 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 191) } 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 192) 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 193) if (enter) f46b16520a087e Daniel Bristot de Oliveira 2021-06-22 194 kdata->nmi_count++; 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 195) } 7b2c86250122de Steven Rostedt (Red Hat 2016-08-04 196) :::::: The code at line 175 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