+#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