tree: https://github.com/rgushchin/linux.git bpfsched.rfc head: f4c466accae6c27a4fbece80f8cec431f685a20c commit: 1bd61b2c1899a1a9e8ba44e9ac2958dea9847d82 [3/7] bpf: sched: add convenient helpers to identify sched entities config: hexagon-randconfig-r002-20210915 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 8cbbd7e0b2aa21ce7e416cfb63d9965518948c35) 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/rgushchin/linux/commit/1bd61b2c1899a1a9e8ba44e9ac2958d... git remote add rgushchin https://github.com/rgushchin/linux.git git fetch --no-tags rgushchin bpfsched.rfc git checkout 1bd61b2c1899a1a9e8ba44e9ac2958dea9847d82 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): cgrp = task_dfl_cgroup(task_of(se)); ^ kernel/sched/bpf_sched.c:71:10: note: did you mean 'task_group'? kernel/sched/sched.h:1912:34: note: 'task_group' declared here static inline struct task_group *task_group(struct task_struct *p) ^ cgrp = task_dfl_cgroup(task_of(se)); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ for (level = cgrp->level; level; level--) ~~~~^ include/linux/sched/task.h:35:9: note: forward declaration of 'struct cgroup' struct cgroup *cgrp; ^ kernel/sched/bpf_sched.c:78:11: error: incomplete definition of type 'struct cgroup' if (cgrp->ancestor_ids[level] == cgrpid) ~~~~^ include/linux/sched/task.h:35:9: note: forward declaration of 'struct cgroup' struct cgroup *cgrp; ^ 1 warning and 3 errors generated. vim +/task_dfl_cgroup +71 kernel/sched/bpf_sched.c 63 64 BPF_CALL_2(bpf_sched_entity_belongs_to_cgrp, struct sched_entity *, se, 65 u64, cgrpid) 66 { 67 struct cgroup *cgrp; 68 int level; 69 70 if (entity_is_task(se)) 72 #ifdef CONFIG_FAIR_GROUP_SCHED 73 else 74 cgrp = se->cfs_rq->tg->css.cgroup; 75 #endif 76 78 if (cgrp->ancestor_ids[level] == cgrpid) 79 return 1; 80 81 return 0; 82 } 83 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org