btf__load_from_kernel_by_id_split
btf = btf__load_from_kernel_by_id_split(btf_id, base_btf);
return btf__load_from_kernel_by_id_split(id, NULL);
LIBBPF_API struct btf *btf__load_from_kernel_by_id_split(__u32 id, struct btf *base_btf);
btf = btf__load_from_kernel_by_id_split(id, vmlinux);