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Commit fc087e10 authored by David Vrabel's avatar David Vrabel Committed by Konrad Rzeszutek Wilk
Browse files

xen/events: remove unnecessary init_evtchn_cpu_bindings() 



Because the guest-side binding of an event to a VCPU (i.e., setting
the local per-cpu masks) is always explicitly done after an event
channel is bound to a port, there is no need to initialize all
possible events as bound to VCPU 0 at start of day or after a resume.

Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
Reviewed-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent 87295185

drivers/xen/events.c

+0 −22
Original line number Diff line number Diff line
@@ -334,24 +334,6 @@ static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu) 
	info_for_irq(irq)->cpu = cpu;

}



static void init_evtchn_cpu_bindings(void)

{

	int i;

#ifdef CONFIG_SMP

	struct irq_info *info;



	/* By default all event channels notify CPU#0. */

	list_for_each_entry(info, &xen_irq_list_head, list) {

		struct irq_desc *desc = irq_to_desc(info->irq);

		cpumask_copy(desc->irq_data.affinity, cpumask_of(0));

	}

#endif



	for_each_possible_cpu(i)

		memset(per_cpu(cpu_evtchn_mask, i),

		       (i == 0) ? ~0 : 0, NR_EVENT_CHANNELS/8);

}



static inline void clear_evtchn(int port)

{

	struct shared_info *s = HYPERVISOR_shared_info;
@@ -1778,8 +1760,6 @@ void xen_irq_resume(void) 
	unsigned int cpu, evtchn;

	struct irq_info *info;



	init_evtchn_cpu_bindings();



	/* New event-channel space is not 'live' yet. */

	for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)

		mask_evtchn(evtchn);
@@ -1890,8 +1870,6 @@ void __init xen_init_IRQ(void) 
	for (i = 0; i < NR_EVENT_CHANNELS; i++)

		evtchn_to_irq[i] = -1;



	init_evtchn_cpu_bindings();



	/* No event channels are 'live' right now. */

	for (i = 0; i < NR_EVENT_CHANNELS; i++)

		mask_evtchn(i);