* [paulmck-rcu:dev.2022.01.04a 52/55] kernel/stop_machine.c:207:6: warning: variable 't' set but not used
@ 2022-01-08 12:25 kernel test robot
2022-01-08 15:49 ` Paul E. McKenney
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2022-01-08 12:25 UTC (permalink / raw)
To: Paul E. McKenney; +Cc: llvm, kbuild-all, linux-kernel
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>
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
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [paulmck-rcu:dev.2022.01.04a 52/55] kernel/stop_machine.c:207:6: warning: variable 't' set but not used
2022-01-08 12:25 [paulmck-rcu:dev.2022.01.04a 52/55] kernel/stop_machine.c:207:6: warning: variable 't' set but not used kernel test robot
@ 2022-01-08 15:49 ` Paul E. McKenney
0 siblings, 0 replies; 2+ messages in thread
From: Paul E. McKenney @ 2022-01-08 15:49 UTC (permalink / raw)
To: kernel test robot; +Cc: llvm, kbuild-all, linux-kernel
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
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-01-08 12:25 [paulmck-rcu:dev.2022.01.04a 52/55] kernel/stop_machine.c:207:6: warning: variable 't' set but not used kernel test robot
2022-01-08 15:49 ` Paul E. McKenney
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