kernel/bpf/cgroup_iter.c

313 	struct bpf_iter_css_kern *kit = (void *)it;
318 	kit->start = NULL;
328 	kit->start = start;
329 	kit->pos = NULL;
330 	kit->flags = flags;
336 	struct bpf_iter_css_kern *kit = (void *)it;
338 	if (!kit->start)
341 	switch (kit->flags) {
343 		kit->pos = css_next_descendant_pre(kit->pos, kit->start);
346 		kit->pos = css_next_descendant_post(kit->pos, kit->start);
349 		kit->pos = kit->pos ? kit->pos->parent : kit->start;
352 	return kit->pos;