prog_list_length
total_cnt += prog_list_length(&cgrp->bpf.progs[atype], NULL);
cnt = min_t(int, prog_list_length(progs, NULL), total_cnt);
cnt = prog_list_length(&p->bpf.progs[atype], NULL);
cnt += prog_list_length(&p->bpf.progs[atype], &preorder_cnt);
if (prog_list_length(progs, NULL) >= BPF_CGROUP_MAX_PROGS)