tree: https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android13-5.15 head: b7e4947b29bb8d0351c581d9365780d9b6f4d702 commit: 50f5345c8756129044a3246800f51f04ae2f55b0 [2898/2936] ANDROID: __migrate_task header config: arm-randconfig-r003-20220124 (https://download.01.org/0day-ci/archive/20220125/202201250831.PBiV30bo-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 2e58a18910867ba6795066e044293e6daf89edf5) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/ammarfaizi2/linux-block/commit/50f5345c8756129044a3246... git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android13-5.15 git checkout 50f5345c8756129044a3246800f51f04ae2f55b0 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash kernel/ 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 >>): In file included from kernel/sched/core.c:13: static inline rq *__migrate_task(struct rq *rq, struct rq_flags *rf, ^ struct 1 error generated. -- In file included from kernel/sched/fair.c:23: static inline rq *__migrate_task(struct rq *rq, struct rq_flags *rf, ^ struct kernel/sched/fair.c:628:5: warning: no previous prototype for function 'sched_update_scaling' [-Wmissing-prototypes] int sched_update_scaling(void) ^ kernel/sched/fair.c:628:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int sched_update_scaling(void) ^ static kernel/sched/fair.c:4494:6: warning: no previous prototype for function 'set_next_entity' [-Wmissing-prototypes] void set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) ^ kernel/sched/fair.c:4494:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) ^ static 2 warnings and 1 error generated. -- In file included from kernel/sched/rt.c:6: static inline rq *__migrate_task(struct rq *rq, struct rq_flags *rf, ^ struct kernel/sched/rt.c:677:6: warning: no previous prototype for function 'sched_rt_bandwidth_account' [-Wmissing-prototypes] bool sched_rt_bandwidth_account(struct rt_rq *rt_rq) ^ kernel/sched/rt.c:677:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool sched_rt_bandwidth_account(struct rt_rq *rt_rq) ^ static 1 warning and 1 error generated. vim +1553 kernel/sched/sched.h 1548 1549 #ifdef CONFIG_SMP 1550 extern struct rq *__migrate_task(struct rq *rq, struct rq_flags *rf, 1551 struct task_struct *p, int dest_cpu); 1552 #else /* !CONFIG_SMP */ 1554 struct task_struct *p, int dest_cpu) { return rq; } 1555 #endif 1556 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org