tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.19 head: 45baa007ba13bc516470dbd9379b2f7525a087e1 commit: 56b6a5dcf7349d151c47201626e0f1b62334febf [44/59] FROMLIST: sched: Core-wide rq->lock config: sparc-allyesconfig (attached as .config) compiler: sparc64-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 56b6a5dcf7349d151c47201626e0f1b62334febf # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc 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 <<): 109 | void sched_core_get(void) | ^~~~~~~~~~~~~~ 117 | void sched_core_put(void) | ^~~~~~~~~~~~~~ kernel/sched/core.c:1642:6: warning: no previous prototype for 'sched_set_stop_task' [-Wmissing-prototypes] 1642 | void sched_set_stop_task(int cpu, struct task_struct *stop) | ^~~~~~~~~~~~~~~~~~~ kernel/sched/core.c:3843:35: warning: no previous prototype for 'preempt_schedule_irq' [-Wmissing-prototypes] 3843 | asmlinkage __visible void __sched preempt_schedule_irq(void) | ^~~~~~~~~~~~~~~~~~~~ kernel/sched/core.c:6785:5: warning: no previous prototype for 'tg_set_cfs_quota' [-Wmissing-prototypes] 6785 | int tg_set_cfs_quota(struct task_group *tg, long cfs_quota_us) | ^~~~~~~~~~~~~~~~ kernel/sched/core.c:6800:6: warning: no previous prototype for 'tg_get_cfs_quota' [-Wmissing-prototypes] 6800 | long tg_get_cfs_quota(struct task_group *tg) | ^~~~~~~~~~~~~~~~ kernel/sched/core.c:6813:5: warning: no previous prototype for 'tg_set_cfs_period' [-Wmissing-prototypes] 6813 | int tg_set_cfs_period(struct task_group *tg, long cfs_period_us) | ^~~~~~~~~~~~~~~~~ kernel/sched/core.c:6826:6: warning: no previous prototype for 'tg_get_cfs_period' [-Wmissing-prototypes] 6826 | long tg_get_cfs_period(struct task_group *tg) | ^~~~~~~~~~~~~~~~~ vim +/sched_core_get +109 kernel/sched/core.c 108 110 { 111 mutex_lock(&sched_core_mutex); 112 if (!sched_core_count++) 113 __sched_core_enable(); 114 mutex_unlock(&sched_core_mutex); 115 } 116 118 { 119 mutex_lock(&sched_core_mutex); 120 if (!--sched_core_count) 121 __sched_core_disable(); 122 mutex_unlock(&sched_core_mutex); 123 } 124 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org