btf_find_next_decl_tag
int btf_find_next_decl_tag(const struct btf *btf, const struct btf_type *pt,
id = btf_find_next_decl_tag(btf, pt, comp_idx, tag_key,
id = btf_find_next_decl_tag(btf, pt, comp_idx, tag_key, id);
while ((id = btf_find_next_decl_tag(btf, fn_t, i, "arg:", id)) > 0) {