irq: make sure irq_desc for legacy irq get correct node setting

Index: linux-2.6/kernel/irq/handle.c
===================================================================
@@ -161,7 +161,7 @@ int __init early_irq_init(void)
 
 	desc = irq_desc_legacy;
 	legacy_count = ARRAY_SIZE(irq_desc_legacy);
- 	node = first_online_node;
+	node = first_online_node;
 
 	/* allocate irq_desc_ptrs array based on nr_irqs */
 	irq_desc_ptrs = kcalloc(nr_irqs, sizeof(void *), GFP_NOWAIT);

@@ -172,6 +172,9 @@ int __init early_irq_init(void)
 
 	for (i = 0; i < legacy_count; i++) {
 		desc[i].irq = i;
+#ifdef CONFIG_SMP
+		desc[i].node = node;
+#endif
 		desc[i].kstat_irqs = kstat_irqs_legacy + i * nr_cpu_ids;
 		lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
 		alloc_desc_masks(&desc[i], node, true);

Index: linux-2.6/include/linux/irqnr.h
===================================================================
@@ -41,6 +41,12 @@ extern struct irq_desc *irq_to_desc(unsi
 			;						\
 		else
 
+#ifdef CONFIG_SMP
+#define irq_node(irq)	(irq_to_desc(irq)->node)
+#else
+#define irq_node(irq)	0
+#endif
+
 #endif /* CONFIG_GENERIC_HARDIRQS */
 
 #define for_each_irq_nr(irq)                   \

Index: linux-2.6/drivers/pci/intr_remapping.c
===================================================================
@@ -55,15 +55,12 @@ static struct irq_2_iommu *irq_2_iommu(u
 	return desc->irq_2_iommu;
 }
 
-static struct irq_2_iommu *irq_2_iommu_alloc_node(unsigned int irq, int node)
+static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
 {
 	struct irq_desc *desc;
 	struct irq_2_iommu *irq_iommu;
 
-	/*
-	 * alloc irq desc if not allocated already.
-	 */
-	desc = irq_to_desc_alloc_node(irq, node);
+	desc = irq_to_desc(irq);
 	if (!desc) {
 		printk(KERN_INFO "can not get irq_desc for %d\n", irq);
 		return NULL;

@@ -72,16 +69,11 @@ static struct irq_2_iommu *irq_2_iommu_a
 	irq_iommu = desc->irq_2_iommu;
 
 	if (!irq_iommu)
-		desc->irq_2_iommu = get_one_free_irq_2_iommu(node);
+		desc->irq_2_iommu = get_one_free_irq_2_iommu(irq_node(irq));
 
 	return desc->irq_2_iommu;
 }
 
-static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
-{
-	return irq_2_iommu_alloc_node(irq, cpu_to_node(boot_cpu_id));
-}
-
 #else /* !CONFIG_SPARSE_IRQ */
 
 static struct irq_2_iommu irq_2_iommuX[NR_IRQS];