Messages in this thread | | | Date | Sat, 8 Jan 2022 07:49:48 -0800 | From | "Paul E. McKenney" <> | Subject | Re: [paulmck-rcu:dev.2022.01.04a 52/55] kernel/stop_machine.c:207:6: warning: variable 't' set but not used |
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On Sat, Jan 08, 2022 at 08:25:34PM +0800, kernel test robot wrote: > 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 <lkp@intel.com>
This is a debug-only commit, since dropped. But thank you for your ongoing testing efforts!
Thanx, Paul
> 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
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