static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip,
				   struct xenbus_device *dev)
static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip,
				   struct xenbus_device *dev, bool shared)