bpf_iter_task_kern
struct bpf_iter_task_kern *kit = (void *)it;
BUILD_BUG_ON(sizeof(struct bpf_iter_task_kern) > sizeof(struct bpf_iter_task));
BUILD_BUG_ON(__alignof__(struct bpf_iter_task_kern) !=
struct bpf_iter_task_kern *kit = (void *)it;