+static int __irq_prepare_move(int irq, int cpu)
+{
+ struct irq_cfg *cfg = &irq_cfg[irq];
+ int vector;
+ cpumask_t domain;
+
+ if (cfg->move_in_progress || cfg->move_cleanup_count)
+ return -EBUSY;
+ if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
+ return -EINVAL;
+ if (cpu_isset(cpu, cfg->domain))
+ return 0;
+ domain = vector_allocation_domain(cpu);
+ vector = find_unassigned_vector(domain);
+ if (vector < 0)
+ return -ENOSPC;
+ cfg->move_in_progress = 1;
+ cfg->old_domain = cfg->domain;
+ cfg->vector = IRQ_VECTOR_UNASSIGNED;
+ cfg->domain = CPU_MASK_NONE;
+ BUG_ON(__bind_irq_vector(irq, vector, domain));
+ return 0;
+}
+
+int irq_prepare_move(int irq, int cpu)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ ret = __irq_prepare_move(irq, cpu);
+ spin_unlock_irqrestore(&vector_lock, flags);
+ return ret;
+}
+
+void irq_complete_move(unsigned irq)
+{
+ struct irq_cfg *cfg = &irq_cfg[irq];
+ cpumask_t cleanup_mask;
+ int i;
+
+ if (likely(!cfg->move_in_progress))
+ return;
+
+ if (unlikely(cpu_isset(smp_processor_id(), cfg->old_domain)))
+ return;
+
+ cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
+ cfg->move_cleanup_count = cpus_weight(cleanup_mask);
+ for_each_cpu_mask(i, cleanup_mask)
+ platform_send_ipi(i, IA64_IRQ_MOVE_VECTOR, IA64_IPI_DM_INT, 0);
+ cfg->move_in_progress = 0;
+}
+
+static irqreturn_t smp_irq_move_cleanup_interrupt(int irq, void *dev_id)
+{
+ int me = smp_processor_id();
+ ia64_vector vector;
+ unsigned long flags;
+
+ for (vector = IA64_FIRST_DEVICE_VECTOR;
+ vector < IA64_LAST_DEVICE_VECTOR; vector++) {
+ int irq;
+ struct irq_desc *desc;
+ struct irq_cfg *cfg;
+ irq = __get_cpu_var(vector_irq)[vector];
+ if (irq < 0)
+ continue;
+
+ desc = irq_desc + irq;
+ cfg = irq_cfg + irq;
+ spin_lock(&desc->lock);
+ if (!cfg->move_cleanup_count)
+ goto unlock;
+
+ if (!cpu_isset(me, cfg->old_domain))
+ goto unlock;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ __get_cpu_var(vector_irq)[vector] = -1;
+ cpu_clear(me, vector_table[vector]);
+ spin_unlock_irqrestore(&vector_lock, flags);
+ cfg->move_cleanup_count--;
+ unlock:
+ spin_unlock(&desc->lock);
+ }
+ return IRQ_HANDLED;
+}
+
+static struct irqaction irq_move_irqaction = {
+ .handler = smp_irq_move_cleanup_interrupt,
+ .flags = IRQF_DISABLED,
+ .name = "irq_move"
+};
+