void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout) __read_mostly;
EXPORT_SYMBOL_GPL(nf_ct_timeout_put_hook);
-static struct nf_ct_ext_type timeout_extend __read_mostly = {
+static const struct nf_ct_ext_type timeout_extend = {
.len = sizeof(struct nf_conn_timeout),
.align = __alignof__(struct nf_conn_timeout),
.id = NF_CT_EXT_TIMEOUT,