tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core head: 2dfdb3d20ad50e2ae2cb84cbceb0f0fc75e79e5d commit: 66b4da2b7ae40a896693187de1296aee6974c33f [17/19] sched, rt: support schedstats for RT sched class config: m68k-buildonly-randconfig-r002-20210910 (attached as .config) compiler: m68k-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://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 66b4da2b7ae40a896693187de1296aee6974c33f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=m68k 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 >>): kernel/sched/rt.c:253:6: warning: no previous prototype for 'free_rt_sched_group' [-Wmissing-prototypes] 253 | void free_rt_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~ kernel/sched/rt.c:255:5: warning: no previous prototype for 'alloc_rt_sched_group' [-Wmissing-prototypes] 255 | int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent) | ^~~~~~~~~~~~~~~~~~~~ kernel/sched/rt.c:669:6: warning: no previous prototype for 'sched_rt_bandwidth_account' [-Wmissing-prototypes] 669 | bool sched_rt_bandwidth_account(struct rt_rq *rt_rq) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/rt.c: In function 'update_stats_wait_start_rt': 1292 | struct task_struct *p = NULL; | ^ kernel/sched/rt.c: In function 'update_stats_enqueue_sleeper_rt': kernel/sched/rt.c:1311:29: warning: variable 'p' set but not used [-Wunused-but-set-variable] 1311 | struct task_struct *p = NULL; | ^ kernel/sched/rt.c: In function 'update_stats_wait_end_rt': kernel/sched/rt.c:1341:29: warning: variable 'p' set but not used [-Wunused-but-set-variable] 1341 | struct task_struct *p = NULL; | ^ vim +/p +1292 kernel/sched/rt.c 1287 1288 static inline void 1289 update_stats_wait_start_rt(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se) 1290 { 1291 struct sched_statistics *stats; 1293 1294 if (!schedstat_enabled()) 1295 return; 1296 1297 if (rt_entity_is_task(rt_se)) 1298 p = rt_task_of(rt_se); 1299 1300 stats = __schedstats_from_rt_se(rt_se); 1301 if (!stats) 1302 return; 1303 1304 __update_stats_wait_start(rq_of_rt_rq(rt_rq), p, stats); 1305 } 1306 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org