SET_CHANNELMASK(channel[from_ch].channel_layer, to_ch);
SET_CHANNELMASK(channel[to_ch].channel_layer, from_ch);
void add_channel_layer(int to_ch, int from_ch){	if (to_ch >= MAX_CHANNELS || from_ch >= MAX_CHANNELS)		return;	/* add a channel layer */	SET_CHANNELMASK(channel[from_ch].channel_layer, to_ch);	UNSET_CHANNELMASK(channel[to_ch].channel_layer, to_ch);	ctl->cmsg(CMSG_INFO, VERB_NOISY,			"Channel Layer (CH:%d -> CH:%d)", from_ch, to_ch);}