powerpc: make irq_choose_cpu() available to all PIC drivers

Move irq_choose_cpu() into arch/powerpc/kernel/irq.c so that it can be used
by other PIC drivers.  The function is not MPIC-specific.
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/include/asm/irq.h

@@ -330,5 +330,7 @@ extern int call_handle_irq(int irq, void *p1,
 			   struct thread_info *tp, void *func);
 extern void do_IRQ(struct pt_regs *regs);
 
+int irq_choose_cpu(const struct cpumask *mask);
+
 #endif /* _ASM_IRQ_H */
 #endif /* __KERNEL__ */

arch/powerpc/kernel/irq.c

@@ -882,6 +882,41 @@ unsigned int irq_find_mapping(struct irq_host *host,
 }
 EXPORT_SYMBOL_GPL(irq_find_mapping);
 
+#ifdef CONFIG_SMP
+int irq_choose_cpu(const struct cpumask *mask)
+{
+	int cpuid;
+
+	if (cpumask_equal(mask, cpu_all_mask)) {
+		static int irq_rover;
+		static DEFINE_RAW_SPINLOCK(irq_rover_lock);
+		unsigned long flags;
+
+		/* Round-robin distribution... */
+do_round_robin:
+		raw_spin_lock_irqsave(&irq_rover_lock, flags);
+
+		irq_rover = cpumask_next(irq_rover, cpu_online_mask);
+		if (irq_rover >= nr_cpu_ids)
+			irq_rover = cpumask_first(cpu_online_mask);
+
+		cpuid = irq_rover;
+
+		raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
+	} else {
+		cpuid = cpumask_first_and(mask, cpu_online_mask);
+		if (cpuid >= nr_cpu_ids)
+			goto do_round_robin;
+	}
+
+	return get_hard_smp_processor_id(cpuid);
+}
+#else
+int irq_choose_cpu(const struct cpumask *mask)
+{
+	return hard_smp_processor_id();
+}
+#endif
 
 unsigned int irq_radix_revmap_lookup(struct irq_host *host,
 				     irq_hw_number_t hwirq)

arch/powerpc/sysdev/mpic.c

@@ -597,42 +597,6 @@ static void __init mpic_scan_ht_pics(struct mpic *mpic)
 
 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 
-#ifdef CONFIG_SMP
-static int irq_choose_cpu(const struct cpumask *mask)
-{
-	int cpuid;
-
-	if (cpumask_equal(mask, cpu_all_mask)) {
-		static int irq_rover = 0;
-		static DEFINE_RAW_SPINLOCK(irq_rover_lock);
-		unsigned long flags;
-
-		/* Round-robin distribution... */
-	do_round_robin:
-		raw_spin_lock_irqsave(&irq_rover_lock, flags);
-
-		irq_rover = cpumask_next(irq_rover, cpu_online_mask);
-		if (irq_rover >= nr_cpu_ids)
-			irq_rover = cpumask_first(cpu_online_mask);
-
-		cpuid = irq_rover;
-
-		raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
-	} else {
-		cpuid = cpumask_first_and(mask, cpu_online_mask);
-		if (cpuid >= nr_cpu_ids)
-			goto do_round_robin;
-	}
-
-	return get_hard_smp_processor_id(cpuid);
-}
-#else
-static int irq_choose_cpu(const struct cpumask *mask)
-{
-	return hard_smp_processor_id();
-}
-#endif
-
 /* Find an mpic associated with a given linux interrupt */
 static struct mpic *mpic_find(unsigned int irq)
 {