tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core head: 9f47b4eeebb0c1b6e3658591a345e30b8cecd11a commit: 91d4e02a2c05edefcddc5006a7fb55c3a74e956d [8/9] sched: Move SCHED_DEBUG to debugfs config: nios2-defconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 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://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue sched/core git checkout 91d4e02a2c05edefcddc5006a7fb55c3a74e956d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 630 | int sched_update_scaling(void) | ^~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:5388:6: warning: no previous prototype for 'init_cfs_bandwidth' [-Wmissing-prototypes] 5388 | void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {} | ^~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11196:6: warning: no previous prototype for 'free_fair_sched_group' [-Wmissing-prototypes] 11196 | void free_fair_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11198:5: warning: no previous prototype for 'alloc_fair_sched_group' [-Wmissing-prototypes] 11198 | int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent) | ^~~~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11203:6: warning: no previous prototype for 'online_fair_sched_group' [-Wmissing-prototypes] 11203 | void online_fair_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11205:6: warning: no previous prototype for 'unregister_fair_sched_group' [-Wmissing-prototypes] 11205 | void unregister_fair_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/sched_update_scaling +630 kernel/sched/fair.c 625 626 /************************************************************** 627 * Scheduling class statistics methods: 628 */ 629 631 { 632 unsigned int factor = get_update_sysctl_factor(); 633 634 sched_nr_latency = DIV_ROUND_UP(sysctl_sched_latency, 635 sysctl_sched_min_granularity); 636 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org