[PATCH 3/25] x86_64 irq: Reenable migrating irqs to other cpus.

["Eric W. Biederman" <ebiederm@xmission.com>]

In the latest changes the code for migrating x86_64 irqs was dropped.
This reads it in a fashion that will work even if we change the
vector on level triggered irqs when we migrate them.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 arch/x86_64/kernel/io_apic.c |   31 ++++++++++++++++++++++++++++---
 1 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 2e9f1cf..f50be45 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -1572,18 +1572,43 @@ static int ioapic_retrigger_vector(unsig
  * races.
  */
 
-static void ack_apic(unsigned int vector)
+static void ack_apic(unsigned int irq)
 {
 	ack_APIC_irq();
 }
 
+static void ack_apic_edge(unsigned int irq)
+{
+	move_native_irq(irq);
+	ack_APIC_irq();
+}
+
+static void ack_apic_level(unsigned int irq)
+{
+	int do_unmask_irq = 0;
+	/* If we are moving the irq we need to mask it */
+	if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
+		do_unmask_irq = 1;
+		mask_IO_APIC_irq(irq);
+	}
+	/* We must acknowledge the irq before we move it
+	 * or the acknowledge will not propogate properly.
+	 */
+	ack_APIC_irq();
+
+	/* Now we can move and renable the irq */
+	move_masked_irq(irq);
+	if (unlikely(do_unmask_irq))
+		unmask_IO_APIC_irq(irq);
+}
+
 static struct irq_chip ioapic_chip __read_mostly = {
 	.name 		= "IO-APIC",
 	.startup 	= startup_ioapic_vector,
 	.mask	 	= mask_ioapic_vector,
 	.unmask	 	= unmask_ioapic_vector,
-	.ack 		= ack_apic,
-	.eoi 		= ack_apic,
+	.ack 		= ack_apic_edge,
+	.eoi 		= ack_apic_level,
 #ifdef CONFIG_SMP
 	.set_affinity 	= set_ioapic_affinity_vector,
 #endif
-- 
1.4.0.gc07e

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