tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core head: 2dfdb3d20ad50e2ae2cb84cbceb0f0fc75e79e5d commit: 445d9e8ba05d5e9e4b26956b7fe529223e29d8d1 [13/19] sched: make struct sched_statistics independent of fair 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/?id=445d9e8ba05d5e9e4b26956b7fe529223e29d8d1 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 445d9e8ba05d5e9e4b26956b7fe529223e29d8d1 # 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 All warnings (new ones prefixed by >>): kernel/sched/fair.c: In function 'update_curr': kernel/sched/fair.c:860:42: warning: unused variable 'stats' [-Wunused-variable] 860 | struct sched_statistics *stats = __schedstats_from_se(curr); | ^~~~~ kernel/sched/fair.c: In function 'update_stats_wait_start': >> kernel/sched/fair.c:892:34: warning: variable 'stats' set but not used [-Wunused-but-set-variable] 892 | struct sched_statistics *stats; | ^~~~~ kernel/sched/fair.c: In function 'update_stats_wait_end': kernel/sched/fair.c:912:34: warning: variable 'stats' set but not used [-Wunused-but-set-variable] 912 | struct sched_statistics *stats; | ^~~~~ kernel/sched/fair.c: In function 'update_stats_enqueue_sleeper': kernel/sched/fair.c:956:34: warning: variable 'stats' set but not used [-Wunused-but-set-variable] 956 | struct sched_statistics *stats; | ^~~~~ kernel/sched/fair.c: In function 'set_next_entity': kernel/sched/fair.c:4517:42: warning: unused variable 'stats' [-Wunused-variable] 4517 | struct sched_statistics *stats = __schedstats_from_se(se); | ^~~~~ kernel/sched/fair.c: At top level: kernel/sched/fair.c:5505:6: warning: no previous prototype for 'init_cfs_bandwidth' [-Wmissing-prototypes] 5505 | void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {} | ^~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11661:6: warning: no previous prototype for 'free_fair_sched_group' [-Wmissing-prototypes] 11661 | void free_fair_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11663:5: warning: no previous prototype for 'alloc_fair_sched_group' [-Wmissing-prototypes] 11663 | int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent) | ^~~~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11668:6: warning: no previous prototype for 'online_fair_sched_group' [-Wmissing-prototypes] 11668 | void online_fair_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11670:6: warning: no previous prototype for 'unregister_fair_sched_group' [-Wmissing-prototypes] 11670 | void unregister_fair_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/stats +892 kernel/sched/fair.c 840 841 /* 842 * Update the current task's runtime statistics. 843 */ 844 static void update_curr(struct cfs_rq *cfs_rq) 845 { 846 struct sched_entity *curr = cfs_rq->curr; 847 u64 now = rq_clock_task(rq_of(cfs_rq)); 848 u64 delta_exec; 849 850 if (unlikely(!curr)) 851 return; 852 853 delta_exec = now - curr->exec_start; 854 if (unlikely((s64)delta_exec <= 0)) 855 return; 856 857 curr->exec_start = now; 858 859 if (schedstat_enabled()) { > 860 struct sched_statistics *stats = __schedstats_from_se(curr); 861 862 __schedstat_set(stats->exec_max, 863 max(delta_exec, stats->exec_max)); 864 } 865 866 curr->sum_exec_runtime += delta_exec; 867 schedstat_add(cfs_rq->exec_clock, delta_exec); 868 869 curr->vruntime += calc_delta_fair(delta_exec, curr); 870 update_min_vruntime(cfs_rq); 871 872 if (entity_is_task(curr)) { 873 struct task_struct *curtask = task_of(curr); 874 875 trace_sched_stat_runtime(curtask, delta_exec, curr->vruntime); 876 cgroup_account_cputime(curtask, delta_exec); 877 account_group_exec_runtime(curtask, delta_exec); 878 } 879 880 account_cfs_rq_runtime(cfs_rq, delta_exec); 881 } 882 883 static void update_curr_fair(struct rq *rq) 884 { 885 update_curr(cfs_rq_of(&rq->curr->se)); 886 } 887 888 static inline void 889 update_stats_wait_start(struct cfs_rq *cfs_rq, struct sched_entity *se) 890 { 891 u64 wait_start, prev_wait_start; > 892 struct sched_statistics *stats; 893 894 if (!schedstat_enabled()) 895 return; 896 897 stats = __schedstats_from_se(se); 898 899 wait_start = rq_clock(rq_of(cfs_rq)); 900 prev_wait_start = schedstat_val(stats->wait_start); 901 902 if (entity_is_task(se) && task_on_rq_migrating(task_of(se)) && 903 likely(wait_start > prev_wait_start)) 904 wait_start -= prev_wait_start; 905 906 __schedstat_set(stats->wait_start, wait_start); 907 } 908 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org