[Xen-devel] [PATCH 02/13] xen/events: remove unnecessary init_evtchn_cpu_bindings()

[David Vrabel <david.vrabel@xxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>

Event channels are always explicitly bound to a specific VCPU before
they are first enabled.  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: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 drivers/xen/events.c |   22 ----------------------
 1 files changed, 0 insertions(+), 22 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index ddcdbb5..1e2c74b 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -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);
-- 
1.7.2.5


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