tree: https://github.com/zen-kernel/zen-kernel 5.14/cacule head: 4430be30ae5bf7d608eb292aa8680a2dc82ca847 commit: 9e3f9e4d524cfe1d20d03a731930e4d6ebacbfd8 [1/2] CacULE 5.14 config: nios2-allyesconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 11.2.0 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 # https://github.com/zen-kernel/zen-kernel/commit/9e3f9e4d524cfe1d20d03a731... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.14/cacule git checkout 9e3f9e4d524cfe1d20d03a731930e4d6ebacbfd8 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nios2 SHELL=/bin/bash 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/sched/fair.c: In function 'update_IS': 708 | struct list_head *tasks = &rq->cfs_tasks; | ^~ kernel/sched/fair.c: At top level: kernel/sched/fair.c:842:5: warning: no previous prototype for 'sched_update_scaling' [-Wmissing-prototypes] 842 | int sched_update_scaling(void) | ^~~~~~~~~~~~~~~~~~~~ vim +708 kernel/sched/fair.c 704 705 #ifdef CONFIG_CACULE_RDB 706 static void update_IS(struct rq *rq) 707 { 709 struct task_struct *p, *to_migrate = NULL; 710 unsigned int max_IS = ~0, temp_IS; 711 712 list_for_each_entry(p, tasks, se.group_node) { 713 if (task_running(rq, p)) 714 continue; 715 716 temp_IS = calc_interactivity(sched_clock(), &p->se.cacule_node); 717 if (temp_IS < max_IS) { 718 to_migrate = p; 719 max_IS = temp_IS; 720 } 721 } 722 723 if (to_migrate) { 724 WRITE_ONCE(rq->max_IS_score, max_IS); 725 WRITE_ONCE(rq->to_migrate_task, to_migrate); 726 } else if (rq->max_IS_score != ~0) { 727 WRITE_ONCE(rq->max_IS_score, ~0); 728 WRITE_ONCE(rq->to_migrate_task, NULL); 729 } 730 } 731 #endif 732 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org