xen: add resend_irq_on_evtchn() definition into events.c

Define resend_irq_on_evtchn() which ia64/xen uses.
Although it isn't used by current x86/xen code, it's arch generic
so that put it into common code.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 2396b4492f70..4f0f22b020ea 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -586,6 +586,22 @@ static void set_affinity_irq(unsigned irq, cpumask_t dest)
         rebind_irq_to_cpu(irq, tcpu);
 }
 
+int resend_irq_on_evtchn(unsigned int irq)
+{
+        int masked, evtchn = evtchn_from_irq(irq);
+        struct shared_info *s = HYPERVISOR_shared_info;
+
+        if (!VALID_EVTCHN(evtchn))
+                return 1;
+
+        masked = sync_test_and_set_bit(evtchn, s->evtchn_mask);
+        sync_set_bit(evtchn, s->evtchn_pending);
+        if (!masked)
+                unmask_evtchn(evtchn);
+
+        return 1;
+}
+
 static void enable_dynirq(unsigned int irq)
 {
         int evtchn = evtchn_from_irq(irq);