tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tmp.tmp2 head: adcceb5eb7aee38e4a9c15bdf599655f0e1b1324 commit: 54617112331a4cc28268a4321eab5b38baba4d9f [100/364] sched/headers: Remove inclusion from config: x86_64-rhel-8.3 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=54617112331a4cc28268a4321eab5b38baba4d9f git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git git fetch --no-tags tip tmp.tmp2 git checkout 54617112331a4cc28268a4321eab5b38baba4d9f # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): kernel/torture.c: In function 'stutter_wait': >> kernel/torture.c:728:2: error: implicit declaration of function 'cond_resched_tasks_rcu_qs' [-Werror=implicit-function-declaration] 728 | cond_resched_tasks_rcu_qs(); | ^~~~~~~~~~~~~~~~~~~~~~~~~ >> kernel/torture.c:741:5: error: implicit declaration of function 'cond_resched'; did you mean 'need_resched'? [-Werror=implicit-function-declaration] 741 | cond_resched(); | ^~~~~~~~~~~~ | need_resched cc1: some warnings being treated as errors vim +741 kernel/torture.c 628edaa5062282 Paul E. McKenney 2014-01-31 717 628edaa5062282 Paul E. McKenney 2014-01-31 718 /* 628edaa5062282 Paul E. McKenney 2014-01-31 719 * Block until the stutter interval ends. This must be called periodically 628edaa5062282 Paul E. McKenney 2014-01-31 720 * by all running kthreads that need to be subject to stuttering. 628edaa5062282 Paul E. McKenney 2014-01-31 721 */ 474e59b476b339 Paul E. McKenney 2018-08-07 722 bool stutter_wait(const char *title) 628edaa5062282 Paul E. McKenney 2014-01-31 723 { 19012b786ecccb Paul E. McKenney 2020-09-01 724 unsigned int i = 0; e8516c64fe97e2 Paul E. McKenney 2019-04-09 725 bool ret = false; 19012b786ecccb Paul E. McKenney 2020-09-01 726 int spt; 4ced3314fd3a73 Paul E. McKenney 2017-11-21 727 cee43939893337 Paul E. McKenney 2018-03-02 @728 cond_resched_tasks_rcu_qs(); 4ced3314fd3a73 Paul E. McKenney 2017-11-21 729 spt = READ_ONCE(stutter_pause_test); 29d3939084583b Paul E. McKenney 2017-11-21 730 for (; spt; spt = READ_ONCE(stutter_pause_test)) { ab1b7880dec86b Paul E. McKenney 2020-09-22 731 if (!ret) { ab1b7880dec86b Paul E. McKenney 2020-09-22 732 sched_set_normal(current, MAX_NICE); e8516c64fe97e2 Paul E. McKenney 2019-04-09 733 ret = true; ab1b7880dec86b Paul E. McKenney 2020-09-22 734 } 4ced3314fd3a73 Paul E. McKenney 2017-11-21 735 if (spt == 1) { 628edaa5062282 Paul E. McKenney 2014-01-31 736 schedule_timeout_interruptible(1); 4ced3314fd3a73 Paul E. McKenney 2017-11-21 737 } else if (spt == 2) { 19012b786ecccb Paul E. McKenney 2020-09-01 738 while (READ_ONCE(stutter_pause_test)) { ed24affa71f7ab Paul E. McKenney 2020-11-17 739 if (!(i++ & 0xffff)) ed24affa71f7ab Paul E. McKenney 2020-11-17 740 torture_hrtimeout_us(10, 0, NULL); ab7d45053f99f4 Paul E. McKenney 2014-03-04 @741 cond_resched(); 19012b786ecccb Paul E. McKenney 2020-09-01 742 } 4ced3314fd3a73 Paul E. McKenney 2017-11-21 743 } else { 628edaa5062282 Paul E. McKenney 2014-01-31 744 schedule_timeout_interruptible(round_jiffies_relative(HZ)); 4ced3314fd3a73 Paul E. McKenney 2017-11-21 745 } 628edaa5062282 Paul E. McKenney 2014-01-31 746 torture_shutdown_absorb(title); 628edaa5062282 Paul E. McKenney 2014-01-31 747 } e8516c64fe97e2 Paul E. McKenney 2019-04-09 748 return ret; 628edaa5062282 Paul E. McKenney 2014-01-31 749 } 628edaa5062282 Paul E. McKenney 2014-01-31 750 EXPORT_SYMBOL_GPL(stutter_wait); 628edaa5062282 Paul E. McKenney 2014-01-31 751 :::::: The code at line 741 was first introduced by commit :::::: ab7d45053f99f44f81a221eb5c9fbe253ee94524 torture: Increase stutter-end intensity :::::: TO: Paul E. McKenney :::::: CC: Paul E. McKenney --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org