tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core head: 2dfdb3d20ad50e2ae2cb84cbceb0f0fc75e79e5d commit: 2dfdb3d20ad50e2ae2cb84cbceb0f0fc75e79e5d [19/19] sched, dl: support schedstats for deadline 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 2dfdb3d20ad50e2ae2cb84cbceb0f0fc75e79e5d # 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/deadline.c: In function 'update_stats_wait_start_dl': 1486 | struct sched_statistics *stats; | ^~~~~ kernel/sched/deadline.c: In function 'update_stats_wait_end_dl': kernel/sched/deadline.c:1498:34: warning: variable 'stats' set but not used [-Wunused-but-set-variable] 1498 | struct sched_statistics *stats; | ^~~~~ kernel/sched/deadline.c: In function 'update_stats_enqueue_sleeper_dl': kernel/sched/deadline.c:1510:34: warning: variable 'stats' set but not used [-Wunused-but-set-variable] 1510 | struct sched_statistics *stats; | ^~~~~ vim +/stats +1486 kernel/sched/deadline.c 1482 1483 static inline void 1484 update_stats_wait_start_dl(struct dl_rq *dl_rq, struct sched_dl_entity *dl_se) 1485 { 1487 1488 if (!schedstat_enabled()) 1489 return; 1490 1491 stats = __schedstats_from_dl_se(dl_se); 1492 __update_stats_wait_start(rq_of_dl_rq(dl_rq), dl_task_of(dl_se), stats); 1493 } 1494 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org