From 10e580842ec8e53dddf62e1ab1871f4906477376 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 16 Oct 2008 14:19:04 +0200
Subject: genirq: use iterators for irq_desc loops

Use for_each_irq_desc[_reverse] for all the iteration loops.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index e6d47e8..9ce1ab6 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -137,14 +137,12 @@ static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
 static void init_evtchn_cpu_bindings(void)
 {
 #ifdef CONFIG_SMP
+	struct irq_desc *desc;
 	int i;
+
 	/* By default all event channels notify CPU#0. */
-	for (i = 0; i < nr_irqs; i++) {
-		struct irq_desc *desc = irq_to_desc(i);
-		if (!desc)
-			continue;
+	for_each_irq_desc(i, desc)
 		desc->affinity = cpumask_of_cpu(0);
-	}
 #endif
 
 	memset(cpu_evtchn, 0, sizeof(cpu_evtchn));
@@ -233,7 +231,7 @@ static int find_unbound_irq(void)
 	int irq;
 
 	/* Only allocate from dynirq range */
-	for (irq = 0; irq < nr_irqs; irq++)
+	for_each_irq_nr(irq)
 		if (irq_bindcount[irq] == 0)
 			break;
 
@@ -794,7 +792,7 @@ void xen_irq_resume(void)
 		mask_evtchn(evtchn);
 
 	/* No IRQ <-> event-channel mappings. */
-	for (irq = 0; irq < nr_irqs; irq++)
+	for_each_irq_nr(irq)
 		irq_info[irq].evtchn = 0; /* zap event-channel binding */
 
 	for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
@@ -826,7 +824,7 @@ void __init xen_init_IRQ(void)
 		mask_evtchn(i);
 
 	/* Dynamic IRQ space is currently unbound. Zero the refcnts. */
-	for (i = 0; i < nr_irqs; i++)
+	for_each_irq_nr(i)
 		irq_bindcount[i] = 0;
 
 	irq_ctx_init(smp_processor_id());
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index b3a5549..0cbff18 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -30,19 +30,16 @@ static DEFINE_MUTEX(probing_active);
 unsigned long probe_irq_on(void)
 {
 	struct irq_desc *desc;
-	unsigned long mask;
-	unsigned int i;
+	unsigned long mask = 0;
+	unsigned int status;
+	int i;
 
 	mutex_lock(&probing_active);
 	/*
 	 * something may have generated an irq long ago and we want to
 	 * flush such a longstanding irq before considering it as spurious.
 	 */
-	for (i = nr_irqs-1; i > 0; i--) {
-		desc = irq_to_desc(i);
-		if (!desc)
-			continue;
-
+	for_each_irq_desc_reverse(i, desc) {
 		spin_lock_irq(&desc->lock);
 		if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
 			/*
@@ -70,11 +67,7 @@ unsigned long probe_irq_on(void)
 	 * (we must startup again here because if a longstanding irq
 	 * happened in the previous stage, it may have masked itself)
 	 */
-	for (i = nr_irqs-1; i > 0; i--) {
-		desc = irq_to_desc(i);
-		if (!desc)
-			continue;
-
+	for_each_irq_desc_reverse(i, desc) {
 		spin_lock_irq(&desc->lock);
 		if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
 			desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
@@ -92,13 +85,7 @@ unsigned long probe_irq_on(void)
 	/*
 	 * Now filter out any obviously spurious interrupts
 	 */
-	mask = 0;
-	for (i = 0; i < nr_irqs; i++) {
-		unsigned int status;
-
-		desc = irq_to_desc(i);
-		if (!desc)
-			continue;
+	for_each_irq_desc(i, desc) {
 		spin_lock_irq(&desc->lock);
 		status = desc->status;
 
@@ -132,16 +119,11 @@ EXPORT_SYMBOL(probe_irq_on);
  */
 unsigned int probe_irq_mask(unsigned long val)
 {
-	unsigned int mask;
+	unsigned int status, mask = 0;
+	struct irq_desc *desc;
 	int i;
 
-	mask = 0;
-	for (i = 0; i < nr_irqs; i++) {
-		struct irq_desc *desc = irq_to_desc(i);
-		unsigned int status;
-
-		if (!desc)
-			continue;
+	for_each_irq_desc(i, desc) {
 		spin_lock_irq(&desc->lock);
 		status = desc->status;
 
@@ -180,13 +162,10 @@ EXPORT_SYMBOL(probe_irq_mask);
 int probe_irq_off(unsigned long val)
 {
 	int i, irq_found = 0, nr_irqs = 0;
+	struct irq_desc *desc;
+	unsigned int status;
 
-	for (i = 0; i < nr_irqs; i++) {
-		struct irq_desc *desc = irq_to_desc(i);
-		unsigned int status;
-
-		if (!desc)
-			continue;
+	for_each_irq_desc(i, desc) {
 		spin_lock_irq(&desc->lock);
 		status = desc->status;
 
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index a69368f..c815b42 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -268,9 +268,10 @@ static struct lock_class_key irq_desc_lock_class;
 
 void early_init_irq_lock_class(void)
 {
+	struct irq_desc *desc;
 	int i;
 
-	for (i = 0; i < nr_irqs; i++)
-		lockdep_set_class(&irq_desc[i].lock, &irq_desc_lock_class);
+	for_each_irq_desc(i, desc)
+		lockdep_set_class(&desc->lock, &irq_desc_lock_class);
 }
 #endif
-- 
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