tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.4 head: c259747b4f3c520a2cd6fff8fbed5f63355ce07f commit: 0fe13b0a941b5e6adc57431cc380cef82dde314c [2/4] FIXUP: CHROMIUM: sched: Add a per-thread core scheduling interface config: x86_64-randconfig-a014-20210712 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe) 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 remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-5.4 git checkout 0fe13b0a941b5e6adc57431cc380cef82dde314c # 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 >>): kernel/sched/core.c:2725:6: 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:2725:1: 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:5387:35: warning: no previous prototype for function 'schedule_user' [-Wmissing-prototypes] asmlinkage __visible void __sched schedule_user(void) ^ kernel/sched/core.c:5387:22: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage __visible void __sched schedule_user(void) ^ static if ((tsk->core_cookie == (unsigned long)tsk) ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ kernel/sched/core.c:8178:25: note: remove extraneous parentheses around the comparison to silence this warning if ((tsk->core_cookie == (unsigned long)tsk) ~ ^ ~ kernel/sched/core.c:8178:25: note: use '=' to turn this equality comparison into an assignment if ((tsk->core_cookie == (unsigned long)tsk) ^~ = kernel/sched/core.c:1249:28: warning: unused function 'uclamp_bucket_base_value' [-Wunused-function] static inline unsigned int uclamp_bucket_base_value(unsigned int clamp_value) ^ kernel/sched/core.c:1592:1: warning: unused function 'uclamp_update_active' [-Wunused-function] uclamp_update_active(struct task_struct *p, enum uclamp_id clamp_id) ^ 5 warnings generated. vim +8178 kernel/sched/core.c 8148 8149 int task_set_core_sched(int set, struct task_struct *tsk, 8150 unsigned long cookie) 8151 { 8152 if (!tsk) 8153 tsk = current; 8154 8155 if (set != 0 && set != 1) 8156 return -ERANGE; 8157 8158 if (!static_branch_likely(&sched_smt_present)) 8159 return -EINVAL; 8160 8161 if (!sched_feat(CORE_PRCTL)) 8162 return -ENOSYS; 8163 8164 if (set == 0 && !capable(CAP_SYS_ADMIN)) 8165 return -EPERM; 8166 8167 /* 8168 * If cookie was set previously, return -EBUSY if either of the 8169 * following are true: 8170 * 1. Task was previously tagged by CGroup method. 8171 * 2. Task or its parent were tagged by prctl(). 8172 * 8173 * Note that, if CGroup tagging is done after prctl(), then that would 8174 * override the cookie. However, if prctl() is done after task was 8175 * added to tagged CGroup, then the prctl() returns -EBUSY. 8176 */ 8177 if (!!tsk->core_cookie == set) { 8179 #ifdef CONFIG_CGROUP_SCHED 8180 || tsk->core_cookie == (unsigned long)tsk->sched_task_group 8181 #endif 8182 ) { 8183 return -EBUSY; 8184 } 8185 } 8186 8187 if (set) 8188 sched_core_get(); 8189 8190 if (cookie) 8191 tsk->core_cookie = cookie; 8192 else 8193 tsk->core_cookie = set ? (unsigned long)tsk : 0; 8194 8195 stop_machine(task_set_core_sched_stopper, (void *)tsk, NULL); 8196 8197 if (!set) 8198 sched_core_put(); 8199 return 0; 8200 } 8201 #endif 8202 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org