static int find_btf_percpu_datasec(struct btf *btf)
{
	const struct btf_type *t;
	const char *tname;
	int i, n;

	/*
	 * Both vmlinux and module each have their own ".data..percpu"
	 * DATASECs in BTF. So for module's case, we need to skip vmlinux BTF
	 * types to look at only module's own BTF types.
	 */
	n = btf_nr_types(btf);
	if (btf_is_module(btf))
		i = btf_nr_types(btf_vmlinux);
	else
		i = 1;

	for(; i < n; i++) {
		t = btf_type_by_id(btf, i);
		if (BTF_INFO_KIND(t->info) != BTF_KIND_DATASEC)
			continue;

		tname = btf_name_by_offset(btf, t->name_off);
		if (!strcmp(tname, ".data..percpu"))
			return i;
	}

	return -ENOENT;
}