Hi Steven, First bad commit (maybe != root cause): tree: https://github.com/zen-kernel/zen-kernel 5.10/muqss head: 2da693aab6562ed337fd383bdd368d65081cb955 commit: e219172bbe43aed68943e72b19897191b6bd8f8f [14/22] muqss: Fix build error on config leak config: riscv-allyesconfig (attached as .config) compiler: riscv64-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://github.com/zen-kernel/zen-kernel/commit/e219172bbe43aed68943e72b1... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.10/muqss git checkout e219172bbe43aed68943e72b19897191b6bd8f8f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 141 | static int rqshare __read_mostly = CONFIG_SHARERQ; /* Default RQSHARE_MC */ | ^~~~~~~~~~~~~~ | CONFIG_SPARSE_IRQ kernel/sched/MuQSS.c:241:12: warning: no previous prototype for 'arch_sd_sibling_asym_packing' [-Wmissing-prototypes] 241 | int __weak arch_sd_sibling_asym_packing(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:639:6: warning: no previous prototype for 'resched_task' [-Wmissing-prototypes] 639 | void resched_task(struct task_struct *p) | ^~~~~~~~~~~~ kernel/sched/MuQSS.c: In function 'best_mask_cpu': kernel/sched/MuQSS.c:1110:14: warning: variable 'tmp_rq' set but not used [-Wunused-but-set-variable] 1110 | struct rq *tmp_rq; | ^~~~~~ kernel/sched/MuQSS.c: At top level: kernel/sched/MuQSS.c:2386:5: warning: no previous prototype for 'sysctl_schedstats' [-Wmissing-prototypes] 2386 | int sysctl_schedstats(struct ctl_table *table, int write, void *buffer, | ^~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:3076:15: warning: no previous prototype for 'nr_active' [-Wmissing-prototypes] 3076 | unsigned long nr_active(void) | ^~~~~~~~~ kernel/sched/MuQSS.c:6113:6: warning: no previous prototype for '__do_set_cpus_allowed' [-Wmissing-prototypes] 6113 | void __do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) | ^~~~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:6234:6: warning: no previous prototype for 'resched_cpu' [-Wmissing-prototypes] 6234 | void resched_cpu(int cpu) | ^~~~~~~~~~~ kernel/sched/MuQSS.c:6247:6: warning: no previous prototype for 'select_nohz_load_balancer' [-Wmissing-prototypes] 6247 | void select_nohz_load_balancer(int stop_tick) | ^~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:6251:6: warning: no previous prototype for 'set_cpu_sd_state_idle' [-Wmissing-prototypes] 6251 | void set_cpu_sd_state_idle(void) {} | ^~~~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:6305:6: warning: no previous prototype for 'wake_up_idle_cpu' [-Wmissing-prototypes] 6305 | void wake_up_idle_cpu(int cpu) | ^~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:6569:6: warning: no previous prototype for 'sched_set_stop_task' [-Wmissing-prototypes] 6569 | void sched_set_stop_task(int cpu, struct task_struct *stop) | ^~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c: In function 'setup_rq_orders': kernel/sched/MuQSS.c:7186:22: warning: unused variable 'i' [-Wunused-variable] 7186 | int cpu, other_cpu, i; | ^ kernel/sched/MuQSS.c: At top level: kernel/sched/MuQSS.c:7697:6: warning: no previous prototype for 'init_idle_bootup_task' [-Wmissing-prototypes] 7697 | void init_idle_bootup_task(struct task_struct *idle) | ^~~~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7721:20: warning: no previous prototype for 'sched_create_group' [-Wmissing-prototypes] 7721 | struct task_group *sched_create_group(struct task_group *parent) | ^~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7732:6: warning: no previous prototype for 'sched_online_group' [-Wmissing-prototypes] 7732 | void sched_online_group(struct task_group *tg, struct task_group *parent) | ^~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7743:6: warning: no previous prototype for 'sched_destroy_group' [-Wmissing-prototypes] 7743 | void sched_destroy_group(struct task_group *tg) | ^~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7749:6: warning: no previous prototype for 'sched_offline_group' [-Wmissing-prototypes] 7749 | void sched_offline_group(struct task_group *tg) | ^~~~~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7840:20: warning: initialized field overwritten [-Woverride-init] 7840 | .legacy_cftypes = cpu_legacy_files, | ^~~~~~~~~~~~~~~~ kernel/sched/MuQSS.c:7840:20: note: (near initialization for 'cpu_cgrp_subsys.legacy_cftypes') vim +141 kernel/sched/MuQSS.c 9d6b3eef3a1ec2 Con Kolivas 2019-10-25 136 9d6b3eef3a1ec2 Con Kolivas 2019-10-25 137 /* 9d6b3eef3a1ec2 Con Kolivas 2019-10-25 138 * This determines what level of runqueue sharing will be done and is 9d6b3eef3a1ec2 Con Kolivas 2019-10-25 139 * configurable at boot time with the bootparam rqshare = 9d6b3eef3a1ec2 Con Kolivas 2019-10-25 140 */ 9d6b3eef3a1ec2 Con Kolivas 2019-10-25 @141 static int rqshare __read_mostly = CONFIG_SHARERQ; /* Default RQSHARE_MC */ 9d6b3eef3a1ec2 Con Kolivas 2019-10-25 142 :::::: The code at line 141 was first introduced by commit :::::: 9d6b3eef3a1ec22d4d3c74e0b773ff52d3b3a209 MultiQueue Skiplist Scheduler v0.204 :::::: TO: Con Kolivas <kernel(a)kolivas.org&gt; :::::: CC: Steven Barrett <steven(a)liquorix.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org