tree: https://github.com/zen-kernel/zen-kernel 5.7/muqss head: 4567060b2f5ff28fb444b38edc2122aff6aa34ce commit: cd3b420bc9cd575a1eaf051463cfb1204599e8d9 [1/16] MultiQueue Skiplist Scheduler v0.202 config: alpha-allyesconfig (attached as .config) compiler: alpha-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 git checkout cd3b420bc9cd575a1eaf051463cfb1204599e8d9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha 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 >>, old ones prefixed by <<): kernel/sched/MuQSS.c:239:12: warning: no previous prototype for 'arch_sd_sibling_asym_packing' [-Wmissing-prototypes] 239 | int __weak arch_sd_sibling_asym_packing(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:637:6: warning: no previous prototype for 'resched_task' [-Wmissing-prototypes] 637 | void resched_task(struct task_struct *p) | ^~~~~~~~~~~~ kernel/sched/MuQSS.c: In function 'best_mask_cpu': 1092 | struct rq *tmp_rq; | ^~~~~~ kernel/sched/MuQSS.c: At top level: kernel/sched/MuQSS.c:2243:5: warning: no previous prototype for 'sysctl_schedstats' [-Wmissing-prototypes] 2243 | int sysctl_schedstats(struct ctl_table *table, int write, | ^~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:2932:15: warning: no previous prototype for 'nr_active' [-Wmissing-prototypes] 2932 | unsigned long nr_active(void) | ^~~~~~~~~ kernel/sched/MuQSS.c:5880:6: warning: no previous prototype for '__do_set_cpus_allowed' [-Wmissing-prototypes] 5880 | void __do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) | ^~~~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:6000:6: warning: no previous prototype for 'resched_cpu' [-Wmissing-prototypes] 6000 | void resched_cpu(int cpu) | ^~~~~~~~~~~ kernel/sched/MuQSS.c:6013:6: warning: no previous prototype for 'select_nohz_load_balancer' [-Wmissing-prototypes] 6013 | void select_nohz_load_balancer(int stop_tick) | ^~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:6017:6: warning: no previous prototype for 'set_cpu_sd_state_idle' [-Wmissing-prototypes] 6017 | void set_cpu_sd_state_idle(void) {} | ^~~~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:6071:6: warning: no previous prototype for 'wake_up_idle_cpu' [-Wmissing-prototypes] 6071 | void wake_up_idle_cpu(int cpu) | ^~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:6334:6: warning: no previous prototype for 'sched_set_stop_task' [-Wmissing-prototypes] 6334 | void sched_set_stop_task(int cpu, struct task_struct *stop) | ^~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c: In function 'setup_rq_orders': kernel/sched/MuQSS.c:6952:22: warning: unused variable 'i' [-Wunused-variable] 6952 | int cpu, other_cpu, i; | ^ kernel/sched/MuQSS.c: At top level: kernel/sched/MuQSS.c:7464:6: warning: no previous prototype for 'init_idle_bootup_task' [-Wmissing-prototypes] 7464 | void init_idle_bootup_task(struct task_struct *idle) | ^~~~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7488:20: warning: no previous prototype for 'sched_create_group' [-Wmissing-prototypes] 7488 | struct task_group *sched_create_group(struct task_group *parent) | ^~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7499:6: warning: no previous prototype for 'sched_online_group' [-Wmissing-prototypes] 7499 | void sched_online_group(struct task_group *tg, struct task_group *parent) | ^~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7510:6: warning: no previous prototype for 'sched_destroy_group' [-Wmissing-prototypes] 7510 | void sched_destroy_group(struct task_group *tg) | ^~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7516:6: warning: no previous prototype for 'sched_offline_group' [-Wmissing-prototypes] 7516 | void sched_offline_group(struct task_group *tg) | ^~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7607:20: warning: initialized field overwritten [-Woverride-init] 7607 | .legacy_cftypes = cpu_legacy_files, | ^~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7607:20: note: (near initialization for 'cpu_cgrp_subsys.legacy_cftypes') vim +/tmp_rq +1092 kernel/sched/MuQSS.c 1064 1065 /* 1066 * The best idle CPU is chosen according to the CPUIDLE ranking above where the 1067 * lowest value would give the most suitable CPU to schedule p onto next. The 1068 * order works out to be the following: 1069 * 1070 * Same thread, idle or busy cache, idle or busy threads 1071 * Other core, same cache, idle or busy cache, idle threads. 1072 * Same node, other CPU, idle cache, idle threads. 1073 * Same node, other CPU, busy cache, idle threads. 1074 * Other core, same cache, busy threads. 1075 * Same node, other CPU, busy threads. 1076 * Other node, other CPU, idle cache, idle threads. 1077 * Other node, other CPU, busy cache, idle threads. 1078 * Other node, other CPU, busy threads. 1079 */ 1080 static int best_mask_cpu(int best_cpu, struct rq *rq, cpumask_t *tmpmask) 1081 { 1082 int best_ranking = CPUIDLE_DIFF_NODE | CPUIDLE_THREAD_BUSY | 1083 CPUIDLE_DIFF_CPU | CPUIDLE_CACHE_BUSY | CPUIDLE_DIFF_CORE | 1084 CPUIDLE_DIFF_CORE_LLC | CPUIDLE_DIFF_THREAD; 1085 int cpu_tmp; 1086 1087 if (cpumask_test_cpu(best_cpu, tmpmask)) 1088 goto out; 1089 1090 for_each_cpu(cpu_tmp, tmpmask) { 1091 int ranking, locality; 1093 1094 ranking = 0; 1095 tmp_rq = cpu_rq(cpu_tmp); 1096 1097 locality = rq->cpu_locality[cpu_tmp]; 1098 #ifdef CONFIG_NUMA 1099 if (locality > LOCALITY_SMP) 1100 ranking |= CPUIDLE_DIFF_NODE; 1101 else 1102 #endif 1103 if (locality > LOCALITY_MC) 1104 ranking |= CPUIDLE_DIFF_CPU; 1105 #ifdef CONFIG_SCHED_MC 1106 else if (locality == LOCALITY_MC_LLC) 1107 ranking |= CPUIDLE_DIFF_CORE_LLC; 1108 else if (locality == LOCALITY_MC) 1109 ranking |= CPUIDLE_DIFF_CORE; 1110 if (!(tmp_rq->cache_idle(tmp_rq))) 1111 ranking |= CPUIDLE_CACHE_BUSY; 1112 #endif 1113 #ifdef CONFIG_SCHED_SMT 1114 if (locality == LOCALITY_SMT) 1115 ranking |= CPUIDLE_DIFF_THREAD; 1116 #endif 1117 if (ranking < best_ranking 1118 #ifdef CONFIG_SCHED_SMT 1119 || (ranking == best_ranking && (tmp_rq->siblings_idle(tmp_rq))) 1120 #endif 1121 ) { 1122 best_cpu = cpu_tmp; 1123 best_ranking = ranking; 1124 } 1125 } 1126 out: 1127 return best_cpu; 1128 } 1129 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org