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: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 487ca07fcc75d52755c9fe2ee05bcb3b6eeeec44) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 56b6a5dcf7349d151c47201626e0f1b62334febf # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 <<): void sched_core_get(void) ^ kernel/sched/core.c:109:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sched_core_get(void) ^ static void sched_core_put(void) ^ kernel/sched/core.c:117:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sched_core_put(void) ^ static kernel/sched/core.c:1642:6: warning: no previous prototype for function 'sched_set_stop_task' [-Wmissing-prototypes] void sched_set_stop_task(int cpu, struct task_struct *stop) ^ kernel/sched/core.c:1642:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sched_set_stop_task(int cpu, struct task_struct *stop) ^ static kernel/sched/core.c:3843:35: warning: no previous prototype for function 'preempt_schedule_irq' [-Wmissing-prototypes] asmlinkage __visible void __sched preempt_schedule_irq(void) ^ kernel/sched/core.c:3843:22: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage __visible void __sched preempt_schedule_irq(void) ^ static kernel/sched/core.c:6785:5: warning: no previous prototype for function 'tg_set_cfs_quota' [-Wmissing-prototypes] int tg_set_cfs_quota(struct task_group *tg, long cfs_quota_us) ^ kernel/sched/core.c:6785:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int tg_set_cfs_quota(struct task_group *tg, long cfs_quota_us) ^ static kernel/sched/core.c:6800:6: warning: no previous prototype for function 'tg_get_cfs_quota' [-Wmissing-prototypes] long tg_get_cfs_quota(struct task_group *tg) ^ kernel/sched/core.c:6800:1: note: declare 'static' if the function is not intended to be used outside of this translation unit long tg_get_cfs_quota(struct task_group *tg) ^ static kernel/sched/core.c:6813:5: warning: no previous prototype for function 'tg_set_cfs_period' [-Wmissing-prototypes] int tg_set_cfs_period(struct task_group *tg, long cfs_period_us) ^ kernel/sched/core.c:6813:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int tg_set_cfs_period(struct task_group *tg, long cfs_period_us) ^ static kernel/sched/core.c:6826:6: warning: no previous prototype for function 'tg_get_cfs_period' [-Wmissing-prototypes] long tg_get_cfs_period(struct task_group *tg) ^ kernel/sched/core.c:6826:1: note: declare 'static' if the function is not intended to be used outside of this translation unit long tg_get_cfs_period(struct task_group *tg) ^ static 8 warnings generated. 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