tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tmp.tmp2 head: adcceb5eb7aee38e4a9c15bdf599655f0e1b1324 commit: e124b87bf88e97965935e8fa0fd3f9fbf2cd39b2 [117/364] sched/headers: Move CPU affinity APIs from <linux/sched.h> to <linux/sched/affinity.h> 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=e1... 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 e124b87bf88e97965935e8fa0fd3f9fbf2cd39b2 # 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 <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): kernel/torture.c: In function 'torture_shuffle_tasks': 541 | set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask); | ^~~~~~~~~~~~~~~~~~~~ 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 -- mm/page_alloc.c: In function 'deferred_init_memmap': 1981 | set_cpus_allowed_ptr(current, cpumask); | ^~~~~~~~~~~~~~~~~~~~ | set_mems_allowed mm/page_alloc.c: At top level: mm/page_alloc.c:3652:15: warning: no previous prototype for 'should_fail_alloc_page' [-Wmissing-prototypes] 3652 | noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | ^~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/set_cpus_allowed_ptr +541 kernel/torture.c 3808dc9fab0591 Paul E. McKenney 2014-01-28 514 3808dc9fab0591 Paul E. McKenney 2014-01-28 515 /* Shuffle tasks such that we allow shuffle_idle_cpu to become idle. 3808dc9fab0591 Paul E. McKenney 2014-01-28 516 * A special case is when shuffle_idle_cpu = -1, in which case we allow 3808dc9fab0591 Paul E. McKenney 2014-01-28 517 * the tasks to run on all CPUs. 3808dc9fab0591 Paul E. McKenney 2014-01-28 518 */ 3808dc9fab0591 Paul E. McKenney 2014-01-28 519 static void torture_shuffle_tasks(void) 3808dc9fab0591 Paul E. McKenney 2014-01-28 520 { 3808dc9fab0591 Paul E. McKenney 2014-01-28 521 struct shuffle_task *stp; 3808dc9fab0591 Paul E. McKenney 2014-01-28 522 3808dc9fab0591 Paul E. McKenney 2014-01-28 523 cpumask_setall(shuffle_tmp_mask); 3808dc9fab0591 Paul E. McKenney 2014-01-28 524 get_online_cpus(); 3808dc9fab0591 Paul E. McKenney 2014-01-28 525 3808dc9fab0591 Paul E. McKenney 2014-01-28 526 /* No point in shuffling if there is only one online CPU (ex: UP) */ 3808dc9fab0591 Paul E. McKenney 2014-01-28 527 if (num_online_cpus() == 1) { 3808dc9fab0591 Paul E. McKenney 2014-01-28 528 put_online_cpus(); 3808dc9fab0591 Paul E. McKenney 2014-01-28 529 return; 3808dc9fab0591 Paul E. McKenney 2014-01-28 530 } 3808dc9fab0591 Paul E. McKenney 2014-01-28 531 3808dc9fab0591 Paul E. McKenney 2014-01-28 532 /* Advance to the next CPU. Upon overflow, don't idle any CPUs. */ 3808dc9fab0591 Paul E. McKenney 2014-01-28 533 shuffle_idle_cpu = cpumask_next(shuffle_idle_cpu, shuffle_tmp_mask); 3808dc9fab0591 Paul E. McKenney 2014-01-28 534 if (shuffle_idle_cpu >= nr_cpu_ids) 3808dc9fab0591 Paul E. McKenney 2014-01-28 535 shuffle_idle_cpu = -1; 5ed63b199c5b58 Iulia Manda 2014-03-17 536 else 3808dc9fab0591 Paul E. McKenney 2014-01-28 537 cpumask_clear_cpu(shuffle_idle_cpu, shuffle_tmp_mask); 3808dc9fab0591 Paul E. McKenney 2014-01-28 538 3808dc9fab0591 Paul E. McKenney 2014-01-28 539 mutex_lock(&shuffle_task_mutex); 3808dc9fab0591 Paul E. McKenney 2014-01-28 540 list_for_each_entry(stp, &shuffle_task_list, st_l) 3808dc9fab0591 Paul E. McKenney 2014-01-28 @541 set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask); 3808dc9fab0591 Paul E. McKenney 2014-01-28 542 mutex_unlock(&shuffle_task_mutex); 3808dc9fab0591 Paul E. McKenney 2014-01-28 543 3808dc9fab0591 Paul E. McKenney 2014-01-28 544 put_online_cpus(); 3808dc9fab0591 Paul E. McKenney 2014-01-28 545 } 3808dc9fab0591 Paul E. McKenney 2014-01-28 546 :::::: The code at line 541 was first introduced by commit :::::: 3808dc9fab05913060626d7f0edd0f195cb9dcab rcutorture: Abstract torture_shuffle() :::::: TO: Paul E. McKenney <paulmck(a)linux.vnet.ibm.com&gt; :::::: CC: Paul E. McKenney <paulmck(a)linux.vnet.ibm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org