1 files changed, 35 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 5b428e308666..38dd10e2841d 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/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)