xen: use our own eventchannel->irq path

Rather than overloading vectors for event channels, take full
responsibility for mapping an event channel to irq directly.  With
this patch Xen has its own irq allocator.

When the kernel gets an event channel upcall, it maps the event
channel number to an irq and injects it into the normal interrupt
path.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 16 deletions

diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c
index 5a070900ad35..cfd17799bd6d 100644
--- a/arch/x86/xen/irq.c
+++ b/arch/x86/xen/irq.c
@@ -19,21 +19,6 @@ void xen_force_evtchn_callback(void)
         (void)HYPERVISOR_xen_version(0, NULL);
 }
 
-static void __init __xen_init_IRQ(void)
-{
-        int i;
-
-        /* Create identity vector->irq map */
-        for(i = 0; i < NR_VECTORS; i++) {
-                int cpu;
-
-                for_each_possible_cpu(cpu)
-                        per_cpu(vector_irq, cpu)[i] = i;
-        }
-
-        xen_init_IRQ();
-}
-
 static unsigned long xen_save_fl(void)
 {
         struct vcpu_info *vcpu;
@@ -127,7 +112,7 @@ static void xen_halt(void)
 }
 
 static const struct pv_irq_ops xen_irq_ops __initdata = {
-        .init_IRQ = __xen_init_IRQ,
+        .init_IRQ = xen_init_IRQ,
 
         .save_fl = PV_CALLEE_SAVE(xen_save_fl),
         .restore_fl = PV_CALLEE_SAVE(xen_restore_fl),