[PATCH 15/16] powerpc cell: use smp_request_message_ipi

[Milton Miller <miltonm@bga.com>]

cell native has 4 interrupts for ipis, so use the new smp_request_message_ipi
to save pathlength and the data-dependent branch.

This has the side effects of enabling the debugger ipi for kdump and
setting IRQF_PERCPU for the ipi interrupts.  It doesn't undo the virq
mapping if it turns out the ipi is not used.

Signed-off-by: Milton Miller <miltonm@bga.com>

Index: next.git/arch/powerpc/platforms/cell/interrupt.c
===================================================================
--- next.git.orig/arch/powerpc/platforms/cell/interrupt.c	2008-10-04 23:40:24.000000000 -0500
+++ next.git/arch/powerpc/platforms/cell/interrupt.c	2008-10-04 23:44:49.000000000 -0500
@@ -190,38 +190,25 @@ struct irq_host *iic_get_irq_host(int no
 }
 EXPORT_SYMBOL_GPL(iic_get_irq_host);
 
-static irqreturn_t iic_ipi_action(int irq, void *dev_id)
-{
-	int ipi = (int)(long)dev_id;
-
-	smp_message_recv(ipi);
-
-	return IRQ_HANDLED;
-}
-static void iic_request_ipi(int ipi, const char *name)
+static void iic_request_ipi(int ipi)
 {
 	int virq;
 
 	virq = irq_create_mapping(iic_host, iic_ipi_to_irq(ipi));
 	if (virq == NO_IRQ) {
 		printk(KERN_ERR
-		       "iic: failed to map IPI %s\n", name);
+		       "iic: failed to map IPI %s\n", smp_ipi_name[ipi]);
 		return;
 	}
-	if (request_irq(virq, iic_ipi_action, IRQF_DISABLED, name,
-			(void *)(long)ipi))
-		printk(KERN_ERR
-		       "iic: failed to request IPI %s\n", name);
+	smp_request_message_ipi(virq, ipi);
 }
 
 void iic_request_IPIs(void)
 {
-	iic_request_ipi(PPC_MSG_CALL_FUNCTION, "IPI-call");
-	iic_request_ipi(PPC_MSG_RESCHEDULE, "IPI-resched");
-	iic_request_ipi(PPC_MSG_CALL_FUNC_SINGLE, "IPI-call-single");
-#ifdef CONFIG_DEBUGGER
-	iic_request_ipi(PPC_MSG_DEBUGGER_BREAK, "IPI-debug");
-#endif /* CONFIG_DEBUGGER */
+	iic_request_ipi(PPC_MSG_CALL_FUNCTION);
+	iic_request_ipi(PPC_MSG_RESCHEDULE);
+	iic_request_ipi(PPC_MSG_CALL_FUNC_SINGLE);
+	iic_request_ipi(PPC_MSG_DEBUGGER_BREAK);
 }
 
 #endif /* CONFIG_SMP */