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McKenney" Cc: llvm@lists.linux.dev, kbuild-all@lists.01.org, linux-kernel@vger.kernel.org Subject: [paulmck-rcu:dev.2022.01.04a 52/55] kernel/stop_machine.c:207:6: warning: variable 't' set but not used Message-ID: <202201082041.wv0NluSe-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: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2022.01.04a head: 64595d0dff992756e8c6d53c0e9f1e3e50c451f7 commit: 5cd99ef59351bcdd73ce5412934fda67d0ca2a1c [52/55] EXP timers: NMI stacktraces for last-resort jiffies update config: s390-randconfig-r026-20220107 (https://download.01.org/0day-ci/archive/20220108/202201082041.wv0NluSe-lkp@intel.com/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 32167bfe64a4c5dd4eb3f7a58e24f4cba76f5ac2) 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 # install s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=5cd99ef59351bcdd73ce5412934fda67d0ca2a1c git remote add paulmck-rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git git fetch --no-tags paulmck-rcu dev.2022.01.04a git checkout 5cd99ef59351bcdd73ce5412934fda67d0ca2a1c # 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=s390 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> kernel/stop_machine.c:207:6: warning: variable 't' set but not used [-Wunused-but-set-variable] u64 t; ^ 1 warning generated. vim +/t +207 kernel/stop_machine.c 201 202 static void dump_multi_cpu_stop_state(struct multi_stop_data *msdata, bool *firsttime) 203 { 204 struct cpu_stopper *stopper; 205 unsigned long flags; 206 int cpu; > 207 u64 t; 208 209 tick_setup_sched_timer_dump(); 210 pr_info("%s threads %d/%d state %d\n", __func__, atomic_read(&msdata->thread_ack), msdata->num_threads, msdata->state); 211 for_each_online_cpu(cpu) { 212 if (cpu_is_offline(cpu)) 213 continue; 214 stopper = &per_cpu(cpu_stopper, cpu); 215 raw_spin_lock_irqsave(&stopper->lock, flags); 216 t = ktime_get(); 217 // tlast = stopper->lasttime; 218 pr_info("%s: %s%s ->state=%#x%s\n", __func__, stopper->thread->comm, stopper->thread == current ? " (me)" : "", stopper->thread->__state, task_curr(stopper->thread) ? "" : " Not running!"); 219 raw_spin_unlock_irqrestore(&stopper->lock, flags); 220 if (firsttime && *firsttime && !task_curr(stopper->thread)) { 221 trigger_single_cpu_backtrace(cpu); 222 *firsttime = false; 223 } 224 // if (time_after64(t, tlast + NSEC_PER_SEC) && 225 // smp_load_acquire(&multi_stop_cpu_ipi_handled)) { 226 // pr_info("%s: sending IPI from CPU %d to CPU %d\n", __func__, raw_smp_processor_id(), cpu); 227 // WRITE_ONCE(multi_stop_cpu_ipi_handled, false); 228 // smp_mb(); 229 // smp_call_function_single(cpu, multi_stop_cpu_ipi, NULL, 0); 230 // } 231 } 232 } 233 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org