Hi Peng, Thank you for the patch! Yet something to improve: [auto build test ERROR on tip/sched/core] [also build test ERROR on tip/master linux/master linus/master v5.9-rc5 next-20200917] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Peng-Liu/sched-deadline-Fix-sche... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 848785df48835eefebe0c4eb5da7690690b0a8b7 config: x86_64-randconfig-r004-20200917 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1321160a26e7e489baf9b10d6de90a342f898960) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): for_each_cpu(cpu, possible_mask) { ^ for_each_cpu(cpu, possible_mask) { ^~~ include/linux/cpumask.h:203:19: note: expanded from macro 'for_each_cpu' for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) ^~~ 1 warning and 1 error generated. # https://github.com/0day-ci/linux/commit/34a03e474224b29097a1b94a766d6a8eb... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Peng-Liu/sched-deadline-Fix-sched_dl_global_validate/20200918-004123 git checkout 34a03e474224b29097a1b94a766d6a8eb3f7c4e6 vim +/possible_mask +2595 kernel/sched/deadline.c 2584 2585 def_dl_bandwidth.dl_period = global_rt_period(); 2586 def_dl_bandwidth.dl_runtime = global_rt_runtime(); 2587 2588 if (global_rt_runtime() != RUNTIME_INF) 2589 new_bw = to_ratio(global_rt_period(), global_rt_runtime()); 2590 2591 #ifdef CONFIG_SMP 2592 possible_mask = &dl_local_possible_mask; 2593 cpumask_copy(possible_mask, cpu_possible_mask); 2594 #endif /* CONFIG_SMP */ 2596 rcu_read_lock_sched(); 2597 dl_b = dl_bw_of(cpu); 2598 2599 raw_spin_lock_irqsave(&dl_b->lock, flags); 2600 dl_b->bw = new_bw; 2601 raw_spin_unlock_irqrestore(&dl_b->lock, flags); 2602 #ifdef CONFIG_SMP 2603 cpumask_andnot(possible_mask, possible_mask, 2604 cpu_rq(cpu)->rd->span); 2605 #endif /* CONFIG_SMP */ 2606 rcu_read_unlock_sched(); 2607 init_dl_rq_bw_ratio(&cpu_rq(cpu)->dl); 2608 } 2609 } 2610 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org