update_ftrace_direct_mod
int update_ftrace_direct_mod(struct ftrace_ops *ops, struct ftrace_hash *hash, bool do_direct_lock);
err = update_ftrace_direct_mod(&direct_ops, data->modify, true);
WARN_ON_ONCE(update_ftrace_direct_mod(&direct_ops, data->modify, true));
err = update_ftrace_direct_mod(tr->fops, hash, lock_direct_mutex);