dyn_array and nr_irqs support v3 -- addon

Index: linux-2.6/arch/x86/kernel/io_apic_32.c
===================================================================
@@ -345,6 +345,7 @@ static void set_ioapic_affinity_irq(unsi
 	struct irq_pin_list *entry = irq_2_pin + irq;
 	unsigned int apicid_value;
 	cpumask_t tmp;
+	struct irq_desc *desc;
 
 	cpus_and(tmp, cpumask, cpu_online_map);
 	if (cpus_empty(tmp))

@@ -365,7 +366,8 @@ static void set_ioapic_affinity_irq(unsi
 			break;
 		entry = irq_2_pin + entry->next;
 	}
-	irq_desc[irq].affinity = cpumask;
+	desc = get_irq_desc(irq);
+	desc->affinity = cpumask;
 	spin_unlock_irqrestore(&ioapic_lock, flags);
 }
 

@@ -475,10 +477,12 @@ static inline void balance_irq(int cpu,
 static inline void rotate_irqs_among_cpus(unsigned long useful_load_threshold)
 {
 	int i, j;
+	struct irq_desc *desc;
 
 	for_each_online_cpu(i) {
 		for (j = 0; j < nr_irqs; j++) {
-			if (!irq_desc[j].action)
+			desc = get_irq_desc[j];
+			if (!desc->action)
 				continue;
 			/* Is it a significant load ?  */
 			if (IRQ_DELTA(CPU_TO_PACKAGEINDEX(i), j) <

@@ -505,6 +509,7 @@ static void do_irq_balance(void)
 	unsigned long tmp_cpu_irq;
 	unsigned long imbalance = 0;
 	cpumask_t allowed_mask, target_cpu_mask, tmp;
+	struct irq_desc *desc;
 
 	for_each_possible_cpu(i) {
 		int package_index;

@@ -515,7 +520,8 @@ static void do_irq_balance(void)
 		for (j = 0; j < nr_irqs; j++) {
 			unsigned long value_now, delta;
 			/* Is this an active IRQ or balancing disabled ? */
-			if (!irq_desc[j].action || irq_balancing_disabled(j))
+			desc = get_irq_desc[j];
+			if (!desc->action || irq_balancing_disabled(j))
 				continue;
 			if (package_index == i)
 				IRQ_DELTA(package_index, j) = 0;

@@ -609,7 +615,8 @@ tryanotherirq:
 	selected_irq = -1;
 	for (j = 0; j < nr_irqs; j++) {
 		/* Is this an active IRQ? */
-		if (!irq_desc[j].action)
+		desc = get_irq_desc[j];
+		if (!desc->action)
 			continue;
 		if (imbalance <= IRQ_DELTA(max_loaded, j))
 			continue;

@@ -682,10 +689,12 @@ static int balanced_irq(void *unused)
 	int i;
 	unsigned long prev_balance_time = jiffies;
 	long time_remaining = balanced_irq_interval;
+	struct irq_desc *desc;
 
 	/* push everything to CPU 0 to give us a starting point.  */
 	for (i = 0 ; i < nr_irqs ; i++) {
-		irq_desc[i].pending_mask = cpumask_of_cpu(0);
+		desc = get_irq_desc(i);
+		desc->pending_mask = cpumask_of_cpu(0);
 		set_pending_irq(i, cpumask_of_cpu(0));
 	}
 

@@ -1258,13 +1267,16 @@ static struct irq_chip ioapic_chip;
 
 static void ioapic_register_intr(int irq, int vector, unsigned long trigger)
 {
+	struct irq_desc *desc;
+
+	desc = get_irq_desc(irq);
 	if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
 	    trigger == IOAPIC_LEVEL) {
-		irq_desc[irq].status |= IRQ_LEVEL;
+		desc->status |= IRQ_LEVEL;
 		set_irq_chip_and_handler_name(irq, &ioapic_chip,
 					 handle_fasteoi_irq, "fasteoi");
 	} else {
-		irq_desc[irq].status &= ~IRQ_LEVEL;
+		desc->status &= ~IRQ_LEVEL;
 		set_irq_chip_and_handler_name(irq, &ioapic_chip,
 					 handle_edge_irq, "edge");
 	}

@@ -2031,6 +2043,7 @@ static struct irq_chip ioapic_chip __rea
 static inline void init_IO_APIC_traps(void)
 {
 	int irq;
+	struct irq_desc *desc;
 
 	/*
 	 * NOTE! The local APIC isn't very good at handling

@@ -2052,9 +2065,11 @@ static inline void init_IO_APIC_traps(vo
 			 */
 			if (irq < 16)
 				make_8259A_irq(irq);
-			else
+			else {
+				desc = get_irq_desc(irq);
 				/* Strange. Oh, well.. */
-				irq_desc[irq].chip = &no_irq_chip;
+				desc->chip = &no_irq_chip;
+			}
 		}
 	}
 }

@@ -2093,7 +2108,10 @@ static struct irq_chip lapic_chip __read
 
 static void lapic_register_intr(int irq, int vector)
 {
-	irq_desc[irq].status &= ~IRQ_LEVEL;
+	struct irq_desc *desc;
+
+	desc = get_irq_desc(irq);
+	desc->status &= ~IRQ_LEVEL;
 	set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
 				      "edge");
 	set_intr_gate(vector, interrupt[irq]);

@@ -2560,6 +2578,7 @@ static void set_msi_irq_affinity(unsigne
 	unsigned int dest;
 	cpumask_t tmp;
 	int vector;
+	struct irq_desc *desc;
 
 	cpus_and(tmp, mask, cpu_online_map);
 	if (cpus_empty(tmp))

@@ -2579,7 +2598,8 @@ static void set_msi_irq_affinity(unsigne
 	msg.address_lo |= MSI_ADDR_DEST_ID(dest);
 
 	write_msi_msg(irq, &msg);
-	irq_desc[irq].affinity = mask;
+	desc = get_irq_desc(irq);
+	desc->affinity = mask;
 }
 #endif /* CONFIG_SMP */
 

@@ -2653,6 +2673,7 @@ static void set_ht_irq_affinity(unsigned
 {
 	unsigned int dest;
 	cpumask_t tmp;
+	struct irq_desc *desc;
 
 	cpus_and(tmp, mask, cpu_online_map);
 	if (cpus_empty(tmp))

@@ -2663,7 +2684,8 @@ static void set_ht_irq_affinity(unsigned
 	dest = cpu_mask_to_apicid(mask);
 
 	target_ht_irq(irq, dest);
-	irq_desc[irq].affinity = mask;
+	desc = get_irq_desc(irq);
+	desc->affinity = mask;
 }
 #endif
 

224 lines not on this page · raw message

Index: linux-2.6/arch/x86/kernel/irq_32.c
===================================================================
@@ -224,7 +224,7 @@ unsigned int do_IRQ(struct pt_regs *regs
 	struct pt_regs *old_regs;
 	/* high bit used in ret_from_ code */
 	int overflow, irq = ~regs->orig_ax;
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 
 	if (unlikely((unsigned)irq >= nr_irqs)) {
 		printk(KERN_EMERG "%s: cannot handle IRQ %d\n",

@@ -273,15 +273,16 @@ int show_interrupts(struct seq_file *p,
 
 	if (i < nr_irqs) {
 		unsigned any_count = 0;
+		struct irq_desc *desc = get_irq_desc(i);
 
-		spin_lock_irqsave(&irq_desc[i].lock, flags);
+		spin_lock_irqsave(&desc->lock, flags);
 #ifndef CONFIG_SMP
 		any_count = kstat_irqs(i);
 #else
 		for_each_online_cpu(j)
 			any_count |= kstat_cpu(j).irqs[i];
 #endif
-		action = irq_desc[i].action;
+		action = desc->action;
 		if (!action && !any_count)
 			goto skip;
 		seq_printf(p, "%3d: ",i);

@@ -291,8 +292,8 @@ int show_interrupts(struct seq_file *p,
 		for_each_online_cpu(j)
 			seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 #endif
-		seq_printf(p, " %8s", irq_desc[i].chip->name);
-		seq_printf(p, "-%-8s", irq_desc[i].name);
+		seq_printf(p, " %8s", desc->chip->name);
+		seq_printf(p, "-%-8s", desc->name);
 
 		if (action) {
 			seq_printf(p, "  %s", action->name);

@@ -302,7 +303,7 @@ int show_interrupts(struct seq_file *p,
 
 		seq_putc(p, '\n');
 skip:
-		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+		spin_unlock_irqrestore(&desc->lock, flags);
 	} else if (i == nr_irqs) {
 		seq_printf(p, "NMI: ");
 		for_each_online_cpu(j)

@@ -398,17 +399,20 @@ void fixup_irqs(cpumask_t map)
 
 	for (irq = 0; irq < nr_irqs; irq++) {
 		cpumask_t mask;
+		struct irq_desc *desc;
+
 		if (irq == 2)
 			continue;
 
-		cpus_and(mask, irq_desc[irq].affinity, map);
+		desc = get_irq_desc(irq);
+		cpus_and(mask, desc->affinity, map);
 		if (any_online_cpu(mask) == NR_CPUS) {
 			printk("Breaking affinity for irq %i\n", irq);
 			mask = map;
 		}
-		if (irq_desc[irq].chip->set_affinity)
-			irq_desc[irq].chip->set_affinity(irq, mask);
-		else if (irq_desc[irq].action && !(warned++))
+		if (desc->chip->set_affinity)
+			desc->chip->set_affinity(irq, mask);
+		else if (desc->action && !(warned++))
 			printk("Cannot set affinity for irq %i\n", irq);
 	}
 

Index: linux-2.6/arch/x86/kernel/irq_64.c
===================================================================
@@ -83,15 +83,16 @@ int show_interrupts(struct seq_file *p,
 
 	if (i < nr_irqs) {
 		unsigned any_count = 0;
+		struct irq_desc *desc = get_irq_desc(i);
 
-		spin_lock_irqsave(&irq_desc[i].lock, flags);
+		spin_lock_irqsave(&desc->lock, flags);
 #ifndef CONFIG_SMP
 		any_count = kstat_irqs(i);
 #else
 		for_each_online_cpu(j)
 			any_count |= kstat_cpu(j).irqs[i];
 #endif
-		action = irq_desc[i].action;
+		action = desc->action;
 		if (!action && !any_count)
 			goto skip;
 		seq_printf(p, "%3d: ",i);

@@ -101,8 +102,8 @@ int show_interrupts(struct seq_file *p,
 		for_each_online_cpu(j)
 			seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 #endif
-		seq_printf(p, " %8s", irq_desc[i].chip->name);
-		seq_printf(p, "-%-8s", irq_desc[i].name);
+		seq_printf(p, " %8s", desc->chip->name);
+		seq_printf(p, "-%-8s", desc->name);
 
 		if (action) {
 			seq_printf(p, "  %s", action->name);

@@ -111,7 +112,7 @@ int show_interrupts(struct seq_file *p,
 		}
 		seq_putc(p, '\n');
 skip:
-		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+		spin_unlock_irqrestore(&desc->lock, flags);
 	} else if (i == nr_irqs) {
 		seq_printf(p, "NMI: ");
 		for_each_online_cpu(j)

@@ -228,37 +229,39 @@ void fixup_irqs(cpumask_t map)
 		cpumask_t mask;
 		int break_affinity = 0;
 		int set_affinity = 1;
+		struct irq_desc *desc;
 
 		if (irq == 2)
 			continue;
 
+		desc = get_irq_desc(irq);
 		/* interrupt's are disabled at this point */
-		spin_lock(&irq_desc[irq].lock);
+		spin_lock(&desc->lock);
 
 		if (!irq_has_action(irq) ||
-		    cpus_equal(irq_desc[irq].affinity, map)) {
-			spin_unlock(&irq_desc[irq].lock);
+		    cpus_equal(desc->affinity, map)) {
+			spin_unlock(&desc->lock);
 			continue;
 		}
 
-		cpus_and(mask, irq_desc[irq].affinity, map);
+		cpus_and(mask, desc->affinity, map);
 		if (cpus_empty(mask)) {
 			break_affinity = 1;
 			mask = map;
 		}
 
-		if (irq_desc[irq].chip->mask)
-			irq_desc[irq].chip->mask(irq);
+		if (desc->chip->mask)
+			desc->chip->mask(irq);
 
-		if (irq_desc[irq].chip->set_affinity)
-			irq_desc[irq].chip->set_affinity(irq, mask);
+		if (desc->chip->set_affinity)
+			desc->chip->set_affinity(irq, mask);
 		else if (!(warned++))
 			set_affinity = 0;
 
-		if (irq_desc[irq].chip->unmask)
-			irq_desc[irq].chip->unmask(irq);
+		if (desc->chip->unmask)
+			desc->chip->unmask(irq);
 
-		spin_unlock(&irq_desc[irq].lock);
+		spin_unlock(&desc->lock);
 
 		if (break_affinity && set_affinity)
 			printk("Broke affinity for irq %i\n", irq);

Index: linux-2.6/arch/x86/kernel/irqinit_64.c
===================================================================
@@ -143,9 +143,11 @@ static void __init init_ISA_irqs (void)
 	init_8259A(0);
 
 	for (i = 0; i < nr_irqs; i++) {
-		irq_desc[i].status = IRQ_DISABLED;
-		irq_desc[i].action = NULL;
-		irq_desc[i].depth = 1;
+		struct irq_desc *desc = get_irq_desc(i);
+
+		desc->status = IRQ_DISABLED;
+		desc->action = NULL;
+		desc->depth = 1;
 
 		if (i < 16) {
 			/*

@@ -157,7 +159,7 @@ static void __init init_ISA_irqs (void)
 			/*
 			 * 'high' PCI IRQs filled in on demand
 			 */
-			irq_desc[i].chip = &no_irq_chip;
+			desc->chip = &no_irq_chip;
 		}
 	}
 }

Index: linux-2.6/arch/x86/kernel/visws_quirks.c
===================================================================
@@ -486,10 +486,11 @@ static void disable_cobalt_irq(unsigned
 static unsigned int startup_cobalt_irq(unsigned int irq)
 {
 	unsigned long flags;
+	struct irq_desc *desc = get_irq_desc(irq);
 
 	spin_lock_irqsave(&cobalt_lock, flags);
-	if ((irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING)))
-		irq_desc[irq].status &= ~(IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING);
+	if ((desc->status & (IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING)))
+		desc->status &= ~(IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING);
 	enable_cobalt_irq(irq);
 	spin_unlock_irqrestore(&cobalt_lock, flags);
 	return 0;

@@ -508,9 +509,10 @@ static void ack_cobalt_irq(unsigned int
 static void end_cobalt_irq(unsigned int irq)
 {
 	unsigned long flags;
+	struct irq_desc *desc = get_irq_desc(irq);
 
 	spin_lock_irqsave(&cobalt_lock, flags);
-	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+	if (!(desc->status & (IRQ_DISABLED | IRQ_INPROGRESS)))
 		enable_cobalt_irq(irq);
 	spin_unlock_irqrestore(&cobalt_lock, flags);
 }

@@ -628,7 +630,7 @@ static irqreturn_t piix4_master_intr(int
 
 	spin_unlock_irqrestore(&i8259A_lock, flags);
 
-	desc = irq_desc + realirq;
+	desc = get_irq_desc(realirq);
 
 	/*
 	 * handle this 'virtual interrupt' as a Cobalt one now.

@@ -664,27 +666,29 @@ void init_VISWS_APIC_irqs(void)
 	int i;
 
 	for (i = 0; i < CO_IRQ_APIC0 + CO_APIC_LAST + 1; i++) {
-		irq_desc[i].status = IRQ_DISABLED;
-		irq_desc[i].action = 0;
-		irq_desc[i].depth = 1;
+		struct irq_desc *desc = get_irq_desc(i);
+
+		desc->status = IRQ_DISABLED;
+		desc->action = 0;
+		desc->depth = 1;
 
 		if (i == 0) {
-			irq_desc[i].chip = &cobalt_irq_type;
+			desc->chip = &cobalt_irq_type;
 		}
 		else if (i == CO_IRQ_IDE0) {
-			irq_desc[i].chip = &cobalt_irq_type;
+			desc->chip = &cobalt_irq_type;
 		}
 		else if (i == CO_IRQ_IDE1) {
-			irq_desc[i].chip = &cobalt_irq_type;
+			desc->chip = &cobalt_irq_type;
 		}
 		else if (i == CO_IRQ_8259) {
-			irq_desc[i].chip = &piix4_master_irq_type;
+			desc->chip = &piix4_master_irq_type;
 		}
 		else if (i < CO_IRQ_APIC0) {
-			irq_desc[i].chip = &piix4_virtual_irq_type;
+			desc->chip = &piix4_virtual_irq_type;
 		}
 		else if (IS_CO_APIC(i)) {
-			irq_desc[i].chip = &cobalt_irq_type;
+			desc->chip = &cobalt_irq_type;
 		}
 	}
 

Index: linux-2.6/arch/x86/mach-voyager/voyager_smp.c
===================================================================
@@ -1481,7 +1481,7 @@ static void disable_local_vic_irq(unsign
  * the interrupt off to another CPU */
 static void before_handle_vic_irq(unsigned int irq)
 {
-	irq_desc_t *desc = irq_desc + irq;
+	irq_desc_t *desc = get_irq_desc(irq);
 	__u8 cpu = smp_processor_id();
 
 	_raw_spin_lock(&vic_irq_lock);

@@ -1516,7 +1516,7 @@ static void before_handle_vic_irq(unsign
 /* Finish the VIC interrupt: basically mask */
 static void after_handle_vic_irq(unsigned int irq)
 {
-	irq_desc_t *desc = irq_desc + irq;
+	irq_desc_t *desc = get_irq_desc(irq);
 
 	_raw_spin_lock(&vic_irq_lock);
 	{

Index: linux-2.6/drivers/gpio/gpiolib.c
===================================================================
@@ -1058,7 +1058,7 @@ static void gpiolib_dbg_show(struct seq_
 
 		if (!is_out) {
 			int		irq = gpio_to_irq(gpio);
-			struct irq_desc	*desc = irq_desc + irq;
+			struct irq_desc	*desc = get_irq_desc(irq);
 
 			/* This races with request_irq(), set_irq_type(),
 			 * and set_irq_wake() ... but those are "rare".

Index: linux-2.6/drivers/mfd/asic3.c
===================================================================
@@ -124,7 +124,7 @@ static void asic3_irq_demux(unsigned int
 					irqnr = asic->irq_base +
 						(ASIC3_GPIOS_PER_BANK * bank)
 						+ i;
-					desc = irq_desc + irqnr;
+					desc = get_irq_desc(irqnr);
 					desc->handle_irq(irqnr, desc);
 					if (asic->irq_bothedge[bank] & bit)
 						asic3_irq_flip_edge(asic, base,

@@ -137,7 +137,7 @@ static void asic3_irq_demux(unsigned int
 		for (i = ASIC3_NUM_GPIOS; i < ASIC3_NR_IRQS; i++) {
 			/* They start at bit 4 and go up */
 			if (status & (1 << (i - ASIC3_NUM_GPIOS + 4))) {
-				desc = irq_desc + asic->irq_base + i;
+				desc = get_irq_desc(asic->irq_base + i);
 				desc->handle_irq(asic->irq_base + i,
 						 desc);
 			}

Index: linux-2.6/drivers/mfd/htc-egpio.c
===================================================================
@@ -112,7 +112,7 @@ static void egpio_handler(unsigned int i
 		/* Run irq handler */
 		pr_debug("got IRQ %d\n", irqpin);
 		irq = ei->irq_start + irqpin;
-		desc = &irq_desc[irq];
+		desc = get_irq_desc(irq);
 		desc->handle_irq(irq, desc);
 	}
 }

Index: linux-2.6/drivers/parisc/dino.c
===================================================================
@@ -298,7 +298,8 @@ struct pci_port_ops dino_port_ops = {
 
 static void dino_disable_irq(unsigned int irq)
 {
-	struct dino_device *dino_dev = irq_desc[irq].chip_data;
+	struct irq_desc *desc = get_irq_desc(irq);
+	struct dino_device *dino_dev = desc->chip_data;
 	int local_irq = gsc_find_local_irq(irq, dino_dev->global_irq, DINO_LOCAL_IRQS);
 
 	DBG(KERN_WARNING "%s(0x%p, %d)\n", __func__, dino_dev, irq);

@@ -310,7 +311,8 @@ static void dino_disable_irq(unsigned in
 
 static void dino_enable_irq(unsigned int irq)
 {
-	struct dino_device *dino_dev = irq_desc[irq].chip_data;
+	struct irq_desc *desc = get_irq_desc(irq);
+	struct dino_device *dino_dev = desc->chip_data;
 	int local_irq = gsc_find_local_irq(irq, dino_dev->global_irq, DINO_LOCAL_IRQS);
 	u32 tmp;
 

Index: linux-2.6/drivers/parisc/eisa.c
===================================================================
@@ -346,10 +346,10 @@ static int __init eisa_probe(struct pari
 	}
 	
 	/* Reserve IRQ2 */
-	irq_desc[2].action = &irq2_action;
+	get_irq_desc(2)->action = &irq2_action;
 	
 	for (i = 0; i < 16; i++) {
-		irq_desc[i].chip = &eisa_interrupt_type;
+		get_irq_desc(i)->chip = &eisa_interrupt_type;
 	}
 	
 	EISA_bus = 1;

Index: linux-2.6/drivers/parisc/gsc.c
===================================================================
@@ -108,7 +108,8 @@ int gsc_find_local_irq(unsigned int irq,
 
 static void gsc_asic_disable_irq(unsigned int irq)
 {
-	struct gsc_asic *irq_dev = irq_desc[irq].chip_data;
+	struct irq_desc *desc = get_irq_desc(irq);
+	struct gsc_asic *irq_dev = desc->chip_data;
 	int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
 	u32 imr;
 

@@ -123,7 +124,8 @@ static void gsc_asic_disable_irq(unsigne
 
 static void gsc_asic_enable_irq(unsigned int irq)
 {
-	struct gsc_asic *irq_dev = irq_desc[irq].chip_data;
+	struct irq_desc *desc = get_irq_desc(irq);
+	struct gsc_asic *irq_dev = desc->chip_data;
 	int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
 	u32 imr;
 

@@ -159,12 +161,14 @@ static struct hw_interrupt_type gsc_asic
 int gsc_assign_irq(struct hw_interrupt_type *type, void *data)
 {
 	static int irq = GSC_IRQ_BASE;
+	struct irq_desc *desc;
 
 	if (irq > GSC_IRQ_MAX)
 		return NO_IRQ;
 
-	irq_desc[irq].chip = type;
-	irq_desc[irq].chip_data = data;
+	desc = get_irq_desc(irq);
+	desc->chip = type;
+	desc->chip_data = data;
 	return irq++;
 }
 

Index: linux-2.6/drivers/parisc/iosapic.c
===================================================================
@@ -619,7 +619,9 @@ iosapic_set_irt_data( struct vector_info
 
 static struct vector_info *iosapic_get_vector(unsigned int irq)
 {
-	return irq_desc[irq].chip_data;
+	struct irq_desc *desc = get_irq_desc(irq);
+
+	return desc->chip_data;
 }
 
 static void iosapic_disable_irq(unsigned int irq)

Index: linux-2.6/drivers/parisc/superio.c
===================================================================
@@ -363,7 +363,9 @@ int superio_fixup_irq(struct pci_dev *pc
 #endif
 
 	for (i = 0; i < 16; i++) {
-		irq_desc[i].chip = &superio_interrupt_type;
+		struct irq_desc *desc = get_irq_desc(i);
+
+		desc->chip = &superio_interrupt_type;
 	}
 
 	/*

Index: linux-2.6/drivers/pcmcia/hd64465_ss.c
===================================================================
@@ -234,15 +234,18 @@ static struct hw_interrupt_type hd64465_
  */
 static void hs_map_irq(hs_socket_t *sp, unsigned int irq)
 {
+	struct irq_desc *desc;
+
     	DPRINTK("hs_map_irq(sock=%d irq=%d)\n", sp->number, irq);
 	
 	if (irq >= HS_NUM_MAPPED_IRQS)
 	    return;
 
+	desc = get_irq_desc(irq);
     	hs_mapped_irq[irq].sock = sp;
 	/* insert ourselves as the irq controller */
-	hs_mapped_irq[irq].old_handler = irq_desc[irq].chip;
-	irq_desc[irq].chip = &hd64465_ss_irq_type;
+	hs_mapped_irq[irq].old_handler = desc->chip;
+	desc->chip = &hd64465_ss_irq_type;
 }
 
 

@@ -251,13 +254,16 @@ static void hs_map_irq(hs_socket_t *sp,
  */
 static void hs_unmap_irq(hs_socket_t *sp, unsigned int irq)
 {
+	struct irq_desc *desc;
+
     	DPRINTK("hs_unmap_irq(sock=%d irq=%d)\n", sp->number, irq);
 	
 	if (irq >= HS_NUM_MAPPED_IRQS)
 	    return;
 		
+	desc = get_irq_desc(irq);
 	/* restore the original irq controller */
-	irq_desc[irq].chip = hs_mapped_irq[irq].old_handler;
+	desc->chip = hs_mapped_irq[irq].old_handler;
 }
 
 /*============================================================*/

Index: linux-2.6/drivers/xen/events.c
===================================================================
@@ -125,7 +125,7 @@ static void bind_evtchn_to_cpu(unsigned
 
 	BUG_ON(irq == -1);
 #ifdef CONFIG_SMP
-	irq_desc[irq].affinity = cpumask_of_cpu(cpu);
+	get_irq_desc(irq)->affinity = cpumask_of_cpu(cpu);
 #endif
 
 	__clear_bit(chn, cpu_evtchn_mask[cpu_evtchn[chn]]);

@@ -139,8 +139,10 @@ static void init_evtchn_cpu_bindings(voi
 #ifdef CONFIG_SMP
 	int i;
 	/* By default all event channels notify CPU#0. */
-	for (i = 0; i < nr_irqs; i++)
-		irq_desc[i].affinity = cpumask_of_cpu(0);
+	for (i = 0; i < nr_irqs; i++) {
+		struct irq_desc *desc = get_irq_desc(i);
+		desc->affinity = cpumask_of_cpu(0);
+	}
 #endif
 
 	memset(cpu_evtchn, 0, sizeof(cpu_evtchn));

Index: linux-2.6/include/linux/irq.h
===================================================================
@@ -154,6 +154,10 @@ struct irq_chip {
  * @name:		flow handler name for /proc/interrupts output
  */
 struct irq_desc {
+#ifdef CONFIG_HAVE_DYN_ARRAY
+	unsigned int		irq;
+	struct irq_desc		*next;
+#endif
 	irq_flow_handler_t	handle_irq;
 	struct irq_chip		*chip;
 	struct msi_desc		*msi_desc;

@@ -181,9 +185,9 @@ struct irq_desc {
 	const char		*name;
 } ____cacheline_internodealigned_in_smp;
 
-#ifdef CONFIG_HAVE_DYN_ARRAY
-extern struct irq_desc *irq_desc;
-#else
+extern struct irq_desc *get_irq_desc(unsigned int irq);
+#ifndef CONFIG_HAVE_DYN_ARRAY
+/* could be removed if we get rid of all irq_desc reference */
 extern struct irq_desc irq_desc[NR_IRQS];
 #endif
 

@@ -251,7 +255,10 @@ extern int no_irq_affinity;
 
 static inline int irq_balancing_disabled(unsigned int irq)
 {
-	return irq_desc[irq].status & IRQ_NO_BALANCING_MASK;
+	struct irq_desc *desc;
+
+	desc = get_irq_desc(irq);
+	return desc->status & IRQ_NO_BALANCING_MASK;
 }
 
 /* Handle irq action chains: */

@@ -283,7 +290,7 @@ extern unsigned int __do_IRQ(unsigned in
  */
 static inline void generic_handle_irq(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 
 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 	desc->handle_irq(irq, desc);

@@ -327,7 +334,10 @@ __set_irq_handler(unsigned int irq, irq_
 static inline void __set_irq_handler_unlocked(int irq,
 					      irq_flow_handler_t handler)
 {
-	irq_desc[irq].handle_irq = handler;
+	struct irq_desc *desc;
+
+	desc = get_irq_desc(irq);
+	desc->handle_irq = handler;
 }
 
 /*

@@ -361,7 +371,7 @@ extern void destroy_irq(unsigned int irq
 /* Test to see if a driver has successfully requested an irq */
 static inline int irq_has_action(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 	return desc->action != NULL;
 }
 

@@ -376,10 +386,10 @@ extern int set_irq_chip_data(unsigned in
 extern int set_irq_type(unsigned int irq, unsigned int type);
 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
 
-#define get_irq_chip(irq)	(irq_desc[irq].chip)
-#define get_irq_chip_data(irq)	(irq_desc[irq].chip_data)
-#define get_irq_data(irq)	(irq_desc[irq].handler_data)
-#define get_irq_msi(irq)	(irq_desc[irq].msi_desc)
+#define get_irq_chip(irq)	(get_irq_desc(irq)->chip)
+#define get_irq_chip_data(irq)	(get_irq_desc(irq)->chip_data)
+#define get_irq_data(irq)	(get_irq_desc(irq)->handler_data)
+#define get_irq_msi(irq)	(get_irq_desc(irq)->msi_desc)
 
 #endif /* CONFIG_GENERIC_HARDIRQS */
 

Index: linux-2.6/kernel/irq/autoprobe.c
===================================================================
@@ -39,7 +39,7 @@ unsigned long probe_irq_on(void)
 	 * flush such a longstanding irq before considering it as spurious.
 	 */
 	for (i = nr_irqs-1; i > 0; i--) {
-		desc = irq_desc + i;
+		desc = get_irq_desc(i);
 
 		spin_lock_irq(&desc->lock);
 		if (!desc->action && !(desc->status & IRQ_NOPROBE)) {

@@ -69,7 +69,7 @@ unsigned long probe_irq_on(void)
 	 * happened in the previous stage, it may have masked itself)
 	 */
 	for (i = nr_irqs-1; i > 0; i--) {
-		desc = irq_desc + i;
+		desc = get_irq_desc(i);
 
 		spin_lock_irq(&desc->lock);
 		if (!desc->action && !(desc->status & IRQ_NOPROBE)) {

@@ -92,7 +92,7 @@ unsigned long probe_irq_on(void)
 	for (i = 0; i < nr_irqs; i++) {
 		unsigned int status;
 
-		desc = irq_desc + i;
+		desc = get_irq_desc(i);
 		spin_lock_irq(&desc->lock);
 		status = desc->status;
 

@@ -131,7 +131,7 @@ unsigned int probe_irq_mask(unsigned lon
 
 	mask = 0;
 	for (i = 0; i < nr_irqs; i++) {
-		struct irq_desc *desc = irq_desc + i;
+		struct irq_desc *desc = get_irq_desc(i);
 		unsigned int status;
 
 		spin_lock_irq(&desc->lock);

@@ -174,7 +174,7 @@ int probe_irq_off(unsigned long val)
 	int i, irq_found = 0, nr_irqs = 0;
 
 	for (i = 0; i < nr_irqs; i++) {
-		struct irq_desc *desc = irq_desc + i;
+		struct irq_desc *desc = get_irq_desc(i);
 		unsigned int status;
 
 		spin_lock_irq(&desc->lock);

Index: linux-2.6/kernel/irq/chip.c
===================================================================
@@ -33,7 +33,7 @@ void dynamic_irq_init(unsigned int irq)
 	}
 
 	/* Ensure we don't have left over values from a previous use of this irq */
-	desc = irq_desc + irq;
+	desc = get_irq_desc(irq);
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->status = IRQ_DISABLED;
 	desc->chip = &no_irq_chip;

@@ -65,7 +65,7 @@ void dynamic_irq_cleanup(unsigned int ir
 		return;
 	}
 
-	desc = irq_desc + irq;
+	desc = get_irq_desc(irq);
 	spin_lock_irqsave(&desc->lock, flags);
 	if (desc->action) {
 		spin_unlock_irqrestore(&desc->lock, flags);

@@ -100,7 +100,7 @@ int set_irq_chip(unsigned int irq, struc
 	if (!chip)
 		chip = &no_irq_chip;
 
-	desc = irq_desc + irq;
+	desc = get_irq_desc(irq);
 	spin_lock_irqsave(&desc->lock, flags);
 	irq_chip_set_defaults(chip);
 	desc->chip = chip;

@@ -126,7 +126,7 @@ int set_irq_type(unsigned int irq, unsig
 		return -ENODEV;
 	}
 
-	desc = irq_desc + irq;
+	desc = get_irq_desc(irq);
 	if (desc->chip->set_type) {
 		spin_lock_irqsave(&desc->lock, flags);
 		ret = desc->chip->set_type(irq, type);

@@ -154,7 +154,7 @@ int set_irq_data(unsigned int irq, void
 		return -EINVAL;
 	}
 
-	desc = irq_desc + irq;
+	desc = get_irq_desc(irq);
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->handler_data = data;
 	spin_unlock_irqrestore(&desc->lock, flags);

@@ -179,7 +179,7 @@ int set_irq_msi(unsigned int irq, struct
 		       "Trying to install msi data for IRQ%d\n", irq);
 		return -EINVAL;
 	}
-	desc = irq_desc + irq;
+	desc = get_irq_desc(irq);
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->msi_desc = entry;
 	if (entry)

@@ -197,9 +197,10 @@ int set_irq_msi(unsigned int irq, struct
  */
 int set_irq_chip_data(unsigned int irq, void *data)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc;
 	unsigned long flags;
 
+	desc = get_irq_desc(irq);
 	if (irq >= nr_irqs || !desc->chip) {
 		printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
 		return -EINVAL;

@@ -218,8 +219,9 @@ EXPORT_SYMBOL(set_irq_chip_data);
  */
 static void default_enable(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc;
 
+	desc = get_irq_desc(irq);
 	desc->chip->unmask(irq);
 	desc->status &= ~IRQ_MASKED;
 }

@@ -236,7 +238,10 @@ static void default_disable(unsigned int
  */
 static unsigned int default_startup(unsigned int irq)
 {
-	irq_desc[irq].chip->enable(irq);
+	struct irq_desc *desc;
+
+	desc = get_irq_desc(irq);
+	desc->chip->enable(irq);
 
 	return 0;
 }

@@ -246,8 +251,9 @@ static unsigned int default_startup(unsi
  */
 static void default_shutdown(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc;
 
+	desc = get_irq_desc(irq);
 	desc->chip->mask(irq);
 	desc->status |= IRQ_MASKED;
 }

@@ -550,7 +556,7 @@ __set_irq_handler(unsigned int irq, irq_
 		return;
 	}
 
-	desc = irq_desc + irq;
+	desc = get_irq_desc(irq);
 
 	if (!handle)
 		handle = handle_bad_irq;

@@ -615,7 +621,7 @@ void __init set_irq_noprobe(unsigned int
 		return;
 	}
 
-	desc = irq_desc + irq;
+	desc = get_irq_desc(irq);
 
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->status |= IRQ_NOPROBE;

@@ -633,7 +639,7 @@ void __init set_irq_probe(unsigned int i
 		return;
 	}
 
-	desc = irq_desc + irq;
+	desc = get_irq_desc(irq);
 
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->status &= ~IRQ_NOPROBE;

174 lines not on this page · raw message

Index: linux-2.6/kernel/irq/manage.c
===================================================================
@@ -31,7 +31,7 @@ cpumask_t irq_default_affinity = CPU_MAS
  */
 void synchronize_irq(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 	unsigned int status;
 
 	if (irq >= nr_irqs)

@@ -64,7 +64,7 @@ EXPORT_SYMBOL(synchronize_irq);
  */
 int irq_can_set_affinity(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 
 	if (CHECK_IRQ_PER_CPU(desc->status) || !desc->chip ||
 	    !desc->chip->set_affinity)

@@ -81,7 +81,7 @@ int irq_can_set_affinity(unsigned int ir
  */
 int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 
 	if (!desc->chip->set_affinity)
 		return -EINVAL;

@@ -111,14 +111,16 @@ int irq_set_affinity(unsigned int irq, c
 int irq_select_affinity(unsigned int irq)
 {
 	cpumask_t mask;
+	struct irq_desc *desc;
 
 	if (!irq_can_set_affinity(irq))
 		return 0;
 
 	cpus_and(mask, cpu_online_map, irq_default_affinity);
 
-	irq_desc[irq].affinity = mask;
-	irq_desc[irq].chip->set_affinity(irq, mask);
+	desc = get_irq_desc(irq);
+	desc->affinity = mask;
+	desc->chip->set_affinity(irq, mask);
 
 	set_balance_irq_affinity(irq, mask);
 	return 0;

@@ -140,7 +142,7 @@ int irq_select_affinity(unsigned int irq
  */
 void disable_irq_nosync(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 	unsigned long flags;
 
 	if (irq >= nr_irqs)

@@ -169,7 +171,7 @@ EXPORT_SYMBOL(disable_irq_nosync);
  */
 void disable_irq(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 
 	if (irq >= nr_irqs)
 		return;

@@ -211,7 +213,7 @@ static void __enable_irq(struct irq_desc
  */
 void enable_irq(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 	unsigned long flags;
 
 	if (irq >= nr_irqs)

@@ -225,7 +227,7 @@ EXPORT_SYMBOL(enable_irq);
 
 int set_irq_wake_real(unsigned int irq, unsigned int on)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 	int ret = -ENXIO;
 
 	if (desc->chip->set_wake)

@@ -248,7 +250,7 @@ int set_irq_wake_real(unsigned int irq,
  */
 int set_irq_wake(unsigned int irq, unsigned int on)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 	unsigned long flags;
 	int ret = 0;
 

@@ -288,12 +290,13 @@ EXPORT_SYMBOL(set_irq_wake);
  */
 int can_request_irq(unsigned int irq, unsigned long irqflags)
 {
+	struct irq_desc *desc = get_irq_desc(irq);
 	struct irqaction *action;
 
-	if (irq >= nr_irqs || irq_desc[irq].status & IRQ_NOREQUEST)
+	if (irq >= nr_irqs || desc->status & IRQ_NOREQUEST)
 		return 0;
 
-	action = irq_desc[irq].action;
+	action =desc->action;
 	if (action)
 		if (irqflags & action->flags & IRQF_SHARED)
 			action = NULL;

@@ -342,7 +345,7 @@ static int __irq_set_trigger(struct irq_
  */
 int setup_irq(unsigned int irq, struct irqaction *new)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 	struct irqaction *old, **p;
 	const char *old_name = NULL;
 	unsigned long flags;

@@ -506,7 +509,7 @@ void free_irq(unsigned int irq, void *de
 	if (irq >= nr_irqs)
 		return;
 
-	desc = irq_desc + irq;
+	desc = get_irq_desc(irq);
 	spin_lock_irqsave(&desc->lock, flags);
 	p = &desc->action;
 	for (;;) {

@@ -602,6 +605,7 @@ int request_irq(unsigned int irq, irq_ha
 {
 	struct irqaction *action;
 	int retval;
+	struct irq_desc *desc;
 
 #ifdef CONFIG_LOCKDEP
 	/*

@@ -619,7 +623,8 @@ int request_irq(unsigned int irq, irq_ha
 		return -EINVAL;
 	if (irq >= nr_irqs)
 		return -EINVAL;
-	if (irq_desc[irq].status & IRQ_NOREQUEST)
+	desc = get_irq_desc(irq);
+	if (desc->status & IRQ_NOREQUEST)
 		return -EINVAL;
 	if (!handler)
 		return -EINVAL;

Index: linux-2.6/kernel/irq/migration.c
===================================================================
@@ -3,18 +3,18 @@
 
 void set_pending_irq(unsigned int irq, cpumask_t mask)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 	unsigned long flags;
 
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->status |= IRQ_MOVE_PENDING;
-	irq_desc[irq].pending_mask = mask;
+	desc->pending_mask = mask;
 	spin_unlock_irqrestore(&desc->lock, flags);
 }
 
 void move_masked_irq(int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 	cpumask_t tmp;
 
 	if (likely(!(desc->status & IRQ_MOVE_PENDING)))

@@ -30,7 +30,7 @@ void move_masked_irq(int irq)
 
 	desc->status &= ~IRQ_MOVE_PENDING;
 
-	if (unlikely(cpus_empty(irq_desc[irq].pending_mask)))
+	if (unlikely(cpus_empty(desc->pending_mask)))
 		return;
 
 	if (!desc->chip->set_affinity)

@@ -38,7 +38,7 @@ void move_masked_irq(int irq)
 
 	assert_spin_locked(&desc->lock);
 
-	cpus_and(tmp, irq_desc[irq].pending_mask, cpu_online_map);
+	cpus_and(tmp, desc->pending_mask, cpu_online_map);
 
 	/*
 	 * If there was a valid mask to work with, please

@@ -55,12 +55,12 @@ void move_masked_irq(int irq)
 	if (likely(!cpus_empty(tmp))) {
 		desc->chip->set_affinity(irq,tmp);
 	}
-	cpus_clear(irq_desc[irq].pending_mask);
+	cpus_clear(desc->pending_mask);
 }
 
 void move_native_irq(int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 
 	if (likely(!(desc->status & IRQ_MOVE_PENDING)))
 		return;

Index: linux-2.6/kernel/irq/proc.c
===================================================================
@@ -19,7 +19,7 @@ static struct proc_dir_entry *root_irq_d
 static int irq_affinity_read_proc(char *page, char **start, off_t off,
 				  int count, int *eof, void *data)
 {
-	struct irq_desc *desc = irq_desc + (long)data;
+	struct irq_desc *desc = get_irq_desc((long)data);
 	cpumask_t *mask = &desc->affinity;
 	int len;
 

@@ -45,8 +45,9 @@ static int irq_affinity_write_proc(struc
 {
 	unsigned int irq = (int)(long)data, full_count = count, err;
 	cpumask_t new_value;
+	struct irq_desc *desc = get_irq_desc(irq);
 
-	if (!irq_desc[irq].chip->set_affinity || no_irq_affinity ||
+	if (!desc->chip->set_affinity || no_irq_affinity ||
 	    irq_balancing_disabled(irq))
 		return -EIO;
 

@@ -112,20 +113,20 @@ static int default_affinity_write(struct
 static int irq_spurious_read(char *page, char **start, off_t off,
 				  int count, int *eof, void *data)
 {
-	struct irq_desc *d = &irq_desc[(long) data];
+	struct irq_desc *desc = get_irq_desc((long) data);
 	return sprintf(page, "count %u\n"
 			     "unhandled %u\n"
 			     "last_unhandled %u ms\n",
-			d->irq_count,
-			d->irqs_unhandled,
-			jiffies_to_msecs(d->last_unhandled));
+			desc->irq_count,
+			desc->irqs_unhandled,
+			jiffies_to_msecs(desc->last_unhandled));
 }
 
 #define MAX_NAMELEN 128
 
 static int name_unique(unsigned int irq, struct irqaction *new_action)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = get_irq_desc(irq);
 	struct irqaction *action;
 	unsigned long flags;
 	int ret = 1;

@@ -145,8 +146,9 @@ static int name_unique(unsigned int irq,
 void register_handler_proc(unsigned int irq, struct irqaction *action)
 {
 	char name [MAX_NAMELEN];
+	struct irq_desc *desc = get_irq_desc(irq);
 
-	if (!irq_desc[irq].dir || action->dir || !action->name ||
+	if (!desc->dir || action->dir || !action->name ||
 					!name_unique(irq, action))
 		return;
 

@@ -154,7 +156,7 @@ void register_handler_proc(unsigned int
 	snprintf(name, MAX_NAMELEN, "%s", action->name);
 
 	/* create /proc/irq/1234/handler/ */
-	action->dir = proc_mkdir(name, irq_desc[irq].dir);
+	action->dir = proc_mkdir(name, desc->dir);
 }
 
 #undef MAX_NAMELEN

@@ -165,22 +167,22 @@ void register_irq_proc(unsigned int irq)
 {
 	char name [MAX_NAMELEN];
 	struct proc_dir_entry *entry;
+	struct irq_desc *desc = get_irq_desc(irq);
 
 	if (!root_irq_dir ||
-		(irq_desc[irq].chip == &no_irq_chip) ||
-			irq_desc[irq].dir)
+		(desc->chip == &no_irq_chip) || desc->dir)
 		return;
 
 	memset(name, 0, MAX_NAMELEN);
 	sprintf(name, "%d", irq);
 
 	/* create /proc/irq/1234 */
-	irq_desc[irq].dir = proc_mkdir(name, root_irq_dir);
+	desc->dir = proc_mkdir(name, root_irq_dir);
 
 #ifdef CONFIG_SMP
 	{
 		/* create /proc/irq/<irq>/smp_affinity */
-		entry = create_proc_entry("smp_affinity", 0600, irq_desc[irq].dir);
+		entry = create_proc_entry("smp_affinity", 0600, desc->dir);
 
 		if (entry) {
 			entry->data = (void *)(long)irq;

@@ -190,7 +192,7 @@ void register_irq_proc(unsigned int irq)
 	}
 #endif
 
-	entry = create_proc_entry("spurious", 0444, irq_desc[irq].dir);
+	entry = create_proc_entry("spurious", 0444, desc->dir);
 	if (entry) {
 		entry->data = (void *)(long)irq;
 		entry->read_proc = irq_spurious_read;

@@ -201,8 +203,10 @@ void register_irq_proc(unsigned int irq)
 
 void unregister_handler_proc(unsigned int irq, struct irqaction *action)
 {
-	if (action->dir)
-		remove_proc_entry(action->dir->name, irq_desc[irq].dir);
+	if (action->dir) {
+		struct irq_desc *desc = get_irq_desc(irq);
+		remove_proc_entry(action->dir->name, desc->dir);
+	}
 }
 
 void register_default_affinity_proc(void)

Index: linux-2.6/kernel/irq/resend.c
===================================================================
@@ -36,7 +36,7 @@ static void resend_irqs(unsigned long ar
 	while (!bitmap_empty(irqs_resend, nr_irqs)) {
 		irq = find_first_bit(irqs_resend, nr_irqs);
 		clear_bit(irq, irqs_resend);
-		desc = irq_desc + irq;
+		desc = get_irq_desc(irq);
 		local_irq_disable();
 		desc->handle_irq(irq, desc);
 		local_irq_enable();

Index: linux-2.6/kernel/irq/spurious.c
===================================================================
@@ -92,11 +92,12 @@ static int misrouted_irq(int irq)
 	int ok = 0;
 
 	for (i = 1; i < nr_irqs; i++) {
-		struct irq_desc *desc = irq_desc + i;
+		struct irq_desc *desc;
 
 		if (i == irq)	/* Already tried */
 			continue;
 
+		desc = get_irq_desc(i);
 		if (try_one_irq(i, desc))
 			ok = 1;
 	}

@@ -108,7 +109,7 @@ static void poll_spurious_irqs(unsigned
 {
 	int i;
 	for (i = 1; i < nr_irqs; i++) {
-		struct irq_desc *desc = irq_desc + i;
+		struct irq_desc *desc = get_irq_desc(i);
 		unsigned int status;
 
 		/* Racy but it doesn't matter */

Index: linux-2.6/arch/x86/kernel/io_apic_64.c
===================================================================
@@ -57,7 +57,11 @@
 
 #define __apicdebuginit(type) static type __init
 
+struct irq_cfg;
+
 struct irq_cfg {
+	unsigned int irq;
+	struct irq_cfg *next;
 	cpumask_t domain;
 	cpumask_t old_domain;
 	unsigned move_cleanup_count;

@@ -67,34 +71,112 @@ struct irq_cfg {
 
 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
 static struct irq_cfg irq_cfg_legacy[] __initdata = {
-	[0]  = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR,  },
-	[1]  = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR,  },
-	[2]  = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR,  },
-	[3]  = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR,  },
-	[4]  = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR,  },
-	[5]  = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR,  },
-	[6]  = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR,  },
-	[7]  = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR,  },
-	[8]  = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR,  },
-	[9]  = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR,  },
-	[10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
-	[11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
-	[12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
-	[13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
-	[14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
-	[15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
+	[0]  = { .irq =  0, .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR,  },
+	[1]  = { .irq =  1, .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR,  },
+	[2]  = { .irq =  2, .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR,  },
+	[3]  = { .irq =  3, .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR,  },
+	[4]  = { .irq =  4, .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR,  },
+	[5]  = { .irq =  5, .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR,  },
+	[6]  = { .irq =  6, .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR,  },
+	[7]  = { .irq =  7, .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR,  },
+	[8]  = { .irq =  8, .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR,  },
+	[9]  = { .irq =  9, .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR,  },
+	[10] = { .irq = 10, .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
+	[11] = { .irq = 11, .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
+	[12] = { .irq = 12, .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
+	[13] = { .irq = 13, .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
+	[14] = { .irq = 14, .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
+	[15] = { .irq = 15, .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
 };
 
-static struct irq_cfg *irq_cfg;
+static struct irq_cfg irq_cfg_init = { .irq =  -1U, };
+/* need to be biger than size of irq_cfg_legacy */
+static int nr_irq_cfg = 32;
+
+static int __init parse_nr_irq_cfg(char *arg)
+{
+	if (arg) {
+		nr_irq_cfg = simple_strtoul(arg, NULL, 0);
+		if (nr_irq_cfg < 32)
+			nr_irq_cfg = 32;
+	}
+	return 0;
+}
+
+early_param("nr_irq_cfg", parse_nr_irq_cfg);
+
+static void init_one_irq_cfg(struct irq_cfg *cfg)
+{
+        memcpy(cfg, &irq_cfg_init, sizeof(struct irq_desc));
+}
 
 static void __init init_work(void *data)
 {
 	struct dyn_array *da = data;
+	struct irq_cfg *cfg;
+	int i;
+
+	cfg = *da->name;
+
+	memcpy(cfg, irq_cfg_legacy, sizeof(irq_cfg_legacy));
 
-	memcpy(*da->name, irq_cfg_legacy, sizeof(irq_cfg_legacy));
+	i = sizeof(irq_cfg_legacy)/sizeof(irq_cfg_legacy[0]);
+	for (; i < *da->nr; i++)
+		init_one_irq_cfg(&cfg[i]);
+
+	for (i = 1; i < *da->nr; i++)
+		cfg[i-1].next = &cfg[i];
 }
 
-DEFINE_DYN_ARRAY(irq_cfg, sizeof(struct irq_cfg), nr_irqs, PAGE_SIZE, init_work);
+static struct irq_cfg *irq_cfgx;
+DEFINE_DYN_ARRAY(irq_cfgx, sizeof(struct irq_cfg), nr_irq_cfg, PAGE_SIZE, init_work);
+
+static struct irq_cfg *get_irq_cfg(unsigned int irq)
+{
+	struct irq_cfg *cfg, *cfg_pri;
+	int i;
+	int count = 0;
+
+	BUG_ON(irq == -1U);
+
+	cfg_pri = cfg = &irq_cfgx[0];
+	while (cfg) {
+		if (cfg->irq == irq)
+			return cfg;
+
+		if (cfg->irq == -1U) {
+			cfg->irq = irq;
+			return cfg;
+		}
+		cfg_pri = cfg;
+		cfg = cfg->next;
+		count++;
+	}
+
+	/*
+	 *  we run out of pre-allocate ones, allocate more
+	 */
+	printk(KERN_DEBUG "try to get more irq_cfg %d\n", nr_irq_cfg);
+
+	if (after_bootmem)
+		cfg = kzalloc(sizeof(struct irq_cfg)*nr_irq_cfg, GFP_ATOMIC);
+	else
+		cfg = __alloc_bootmem_nopanic(sizeof(struct irq_cfg)*nr_irq_cfg, PAGE_SIZE, 0);
+
+	if (!cfg)
+		panic("please boot with nr_irq_cfg= %d\n", count * 2);
+
+	for (i = 0; i < nr_irq_cfg; i++)
+		init_one_irq_cfg(&cfg[i]);
+
+	for (i = 1; i < nr_irq_cfg; i++)
+		cfg[i-1].next = &cfg[i];
+
+	cfg->irq = irq;
+	cfg_pri->next = cfg;
+
+	return cfg;
+}
 
 static int assign_irq_vector(int irq, cpumask_t mask);
 

@@ -341,7 +423,7 @@ static void __target_IO_APIC_irq(unsigne
 
 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
 {
-	struct irq_cfg *cfg = irq_cfg + irq;
+	struct irq_cfg *cfg = get_irq_cfg(irq);
 	unsigned long flags;
 	unsigned int dest;
 	cpumask_t tmp;

@@ -806,7 +888,7 @@ static int __assign_irq_vector(int irq,
 	struct irq_cfg *cfg;
 
 	BUG_ON((unsigned)irq >= nr_irqs);
-	cfg = &irq_cfg[irq];
+	cfg = get_irq_cfg(irq);
 
 	/* Only try and allocate irqs on cpus that are present */
 	cpus_and(mask, mask, cpu_online_map);

@@ -880,7 +962,7 @@ static void __clear_irq_vector(int irq)
 	int cpu, vector;
 
 	BUG_ON((unsigned)irq >= nr_irqs);
-	cfg = &irq_cfg[irq];
+	cfg = get_irq_cfg(irq);
 	BUG_ON(!cfg->vector);
 
 	vector = cfg->vector;

@@ -900,17 +982,23 @@ static void __setup_vector_irq(int cpu)
 
 	/* Mark the inuse vectors */
 	for (irq = 0; irq < nr_irqs; ++irq) {
-		if (!cpu_isset(cpu, irq_cfg[irq].domain))
+		struct irq_cfg *cfg = get_irq_cfg(irq);
+
+		if (!cpu_isset(cpu, cfg->domain))
 			continue;
-		vector = irq_cfg[irq].vector;
+		vector = cfg->vector;
 		per_cpu(vector_irq, cpu)[vector] = irq;
 	}
 	/* Mark the free vectors */
 	for (vector = 0; vector < NR_VECTORS; ++vector) {
+		struct irq_cfg *cfg;
+
 		irq = per_cpu(vector_irq, cpu)[vector];
 		if (irq < 0)
 			continue;
-		if (!cpu_isset(cpu, irq_cfg[irq].domain))
+
+		cfg = get_irq_cfg(irq);
+		if (!cpu_isset(cpu, cfg->domain))
 			per_cpu(vector_irq, cpu)[vector] = -1;
 	}
 }

@@ -1024,7 +1112,7 @@ static int setup_ioapic_entry(int apic,
 static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
 			      int trigger, int polarity)
 {
-	struct irq_cfg *cfg = irq_cfg + irq;
+	struct irq_cfg *cfg = get_irq_cfg(irq);
 	struct IO_APIC_route_entry entry;
 	cpumask_t mask;
 

@@ -1550,7 +1638,7 @@ static unsigned int startup_ioapic_irq(u
 
 static int ioapic_retrigger_irq(unsigned int irq)
 {
-	struct irq_cfg *cfg = &irq_cfg[irq];
+	struct irq_cfg *cfg = get_irq_cfg(irq);
 	unsigned long flags;
 
 	spin_lock_irqsave(&vector_lock, flags);

@@ -1597,7 +1685,7 @@ static DECLARE_DELAYED_WORK(ir_migration
  */
 static void migrate_ioapic_irq(int irq, cpumask_t mask)
 {
-	struct irq_cfg *cfg = irq_cfg + irq;
+	struct irq_cfg *cfg = get_irq_cfg(irq);
 	struct irq_desc *desc = get_irq_desc(irq);
 	cpumask_t tmp, cleanup_mask;
 	struct irte irte;

@@ -1730,7 +1818,7 @@ asmlinkage void smp_irq_move_cleanup_int
 			continue;
 
 		desc = get_irq_desc(irq);
-		cfg = irq_cfg + irq;
+		cfg = get_irq_cfg(irq);
 		spin_lock(&desc->lock);
 		if (!cfg->move_cleanup_count)
 			goto unlock;

@@ -1749,7 +1837,7 @@ unlock:
 
 static void irq_complete_move(unsigned int irq)
 {
-	struct irq_cfg *cfg = irq_cfg + irq;
+	struct irq_cfg *cfg = get_irq_cfg(irq);
 	unsigned vector, me;
 
 	if (likely(!cfg->move_in_progress))

@@ -1886,7 +1974,10 @@ static inline void init_IO_APIC_traps(vo
 	 * 0x80, because int 0x80 is hm, kind of importantish. ;)
 	 */
 	for (irq = 0; irq < nr_irqs ; irq++) {
-		if (IO_APIC_IRQ(irq) && !irq_cfg[irq].vector) {
+		struct irq_cfg *cfg;
+
+		cfg = get_irq_cfg(irq);
+		if (IO_APIC_IRQ(irq) && !cfg->vector) {
 			/*
 			 * Hmm.. We don't have an entry for this,
 			 * so default to an old-fashioned 8259

@@ -2023,7 +2114,7 @@ static inline void __init unlock_ExtINT_
  */
 static inline void __init check_timer(void)
 {
-	struct irq_cfg *cfg = irq_cfg + 0;
+	struct irq_cfg *cfg = get_irq_cfg(0);
 	int apic1, pin1, apic2, pin2;
 	unsigned long flags;
 	int no_pin1 = 0;

@@ -2301,13 +2392,15 @@ int create_irq(void)
 	int irq;
 	int new;
 	unsigned long flags;
+	struct irq_cfg *cfg_new;
 
 	irq = -ENOSPC;
 	spin_lock_irqsave(&vector_lock, flags);
 	for (new = (nr_irqs - 1); new >= 0; new--) {
 		if (platform_legacy_irq(new))
 			continue;
-		if (irq_cfg[new].vector != 0)
+		cfg_new = get_irq_cfg(new);
+		if (cfg_new->vector != 0)
 			continue;
 		if (__assign_irq_vector(new, TARGET_CPUS) == 0)
 			irq = new;

@@ -2341,7 +2434,7 @@ void destroy_irq(unsigned int irq)
 #ifdef CONFIG_PCI_MSI
 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
 {
-	struct irq_cfg *cfg = irq_cfg + irq;
+	struct irq_cfg *cfg;
 	int err;
 	unsigned dest;
 	cpumask_t tmp;

@@ -2351,6 +2444,7 @@ static int msi_compose_msg(struct pci_de
 	if (err)
 		return err;
 
+	cfg = get_irq_cfg(irq);
 	cpus_and(tmp, cfg->domain, tmp);
 	dest = cpu_mask_to_apicid(tmp);
 

@@ -2408,7 +2502,7 @@ static int msi_compose_msg(struct pci_de
 #ifdef CONFIG_SMP
 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
 {
-	struct irq_cfg *cfg = irq_cfg + irq;
+	struct irq_cfg *cfg;
 	struct msi_msg msg;
 	unsigned int dest;
 	cpumask_t tmp;

@@ -2421,6 +2515,7 @@ static void set_msi_irq_affinity(unsigne
 	if (assign_irq_vector(irq, mask))
 		return;
 
+	cfg = get_irq_cfg(irq);
 	cpus_and(tmp, cfg->domain, mask);
 	dest = cpu_mask_to_apicid(tmp);
 

@@ -2443,7 +2538,7 @@ static void set_msi_irq_affinity(unsigne
  */
 static void ir_set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
 {
-	struct irq_cfg *cfg = irq_cfg + irq;
+	struct irq_cfg *cfg;
 	unsigned int dest;
 	cpumask_t tmp, cleanup_mask;
 	struct irte irte;

@@ -2459,6 +2554,7 @@ static void ir_set_msi_irq_affinity(unsi
 	if (assign_irq_vector(irq, mask))
 		return;
 
+	cfg = get_irq_cfg(irq);
 	cpus_and(tmp, cfg->domain, mask);
 	dest = cpu_mask_to_apicid(tmp);
 

@@ -2665,7 +2761,7 @@ void arch_teardown_msi_irq(unsigned int
 #ifdef CONFIG_SMP
 static void dmar_msi_set_affinity(unsigned int irq, cpumask_t mask)
 {
-	struct irq_cfg *cfg = irq_cfg + irq;
+	struct irq_cfg *cfg;
 	struct msi_msg msg;
 	unsigned int dest;
 	cpumask_t tmp;

@@ -2678,6 +2774,7 @@ static void dmar_msi_set_affinity(unsign
 	if (assign_irq_vector(irq, mask))
 		return;
 
+	cfg = get_irq_cfg(irq);
 	cpus_and(tmp, cfg->domain, mask);
 	dest = cpu_mask_to_apicid(tmp);
 

@@ -2744,7 +2841,7 @@ static void target_ht_irq(unsigned int i
 
 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
 {
-	struct irq_cfg *cfg = irq_cfg + irq;
+	struct irq_cfg *cfg;
 	unsigned int dest;
 	cpumask_t tmp;
 	struct irq_desc *desc;

@@ -2756,6 +2853,7 @@ static void set_ht_irq_affinity(unsigned
 	if (assign_irq_vector(irq, mask))
 		return;
 
+	cfg = get_irq_cfg(irq);
 	cpus_and(tmp, cfg->domain, mask);
 	dest = cpu_mask_to_apicid(tmp);
 

@@ -2778,7 +2876,7 @@ static struct irq_chip ht_irq_chip = {
 
 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
 {
-	struct irq_cfg *cfg = irq_cfg + irq;
+	struct irq_cfg *cfg;
 	int err;
 	cpumask_t tmp;
 

@@ -2788,6 +2886,7 @@ int arch_setup_ht_irq(unsigned int irq,
 		struct ht_irq_msg msg;
 		unsigned dest;
 
+		cfg = get_irq_cfg(irq);
 		cpus_and(tmp, cfg->domain, tmp);
 		dest = cpu_mask_to_apicid(tmp);
 

@@ -2886,6 +2985,7 @@ int acpi_get_override_irq(int bus_irq, i
 void __init setup_ioapic_dest(void)
 {
 	int pin, ioapic, irq, irq_entry;
+	struct irq_cfg *cfg;
 
 	if (skip_ioapic_setup == 1)
 		return;

@@ -2901,7 +3001,8 @@ void __init setup_ioapic_dest(void)
 			 * when you have too many devices, because at that time only boot
 			 * cpu is online.
 			 */
-			if (!irq_cfg[irq].vector)
+			cfg = get_irq_cfg(irq);
+			if (!cfg->vector)
 				setup_IO_APIC_irq(ioapic, pin, irq,
 						  irq_trigger(irq_entry),
 						  irq_polarity(irq_entry));

Index: linux-2.6/drivers/char/random.c
===================================================================
@@ -559,13 +559,6 @@ struct timer_rand_state {
 
 static struct timer_rand_state input_timer_state;
 
-#ifdef CONFIG_HAVE_DYN_ARRAY
-static struct timer_rand_state **irq_timer_state;
-DEFINE_DYN_ARRAY(irq_timer_state, sizeof(struct timer_rand_state *), nr_irqs, PAGE_SIZE, NULL);
-#else
-static struct timer_rand_state *irq_timer_state[NR_IRQS];
-#endif
-
 /*
  * This function adds entropy to the entropy "pool" by using timing
  * delays.  It uses the timer_rand_state structure to make an estimate

@@ -653,11 +646,20 @@ EXPORT_SYMBOL_GPL(add_input_randomness);
 
 void add_interrupt_randomness(int irq)
 {
-	if (irq >= nr_irqs || irq_timer_state[irq] == NULL)
+	struct timer_rand_state *state;
+	struct irq_desc *desc;
+
+	if (irq >= nr_irqs)
+		return;
+
+	desc = get_irq_desc(irq);
+	state = desc->timer_rand_state;
+
+	if (state == NULL)
 		return;
 
 	DEBUG_ENT("irq event %d\n", irq);
-	add_timer_randomness(irq_timer_state[irq], 0x100 + irq);
+	add_timer_randomness(state, 0x100 + irq);
 }
 
 #ifdef CONFIG_BLOCK

@@ -916,8 +918,15 @@ module_init(rand_initialize);
 void rand_initialize_irq(int irq)
 {
 	struct timer_rand_state *state;
+	struct irq_desc *desc;
+
+	if (irq >= nr_irqs)
+		return;
 
-	if (irq >= nr_irqs || irq_timer_state[irq])
+	desc = get_irq_desc(irq);
+	state = desc->timer_rand_state;
+
+	if (state)
 		return;
 
 	/*

@@ -926,7 +935,7 @@ void rand_initialize_irq(int irq)
 	 */
 	state = kzalloc(sizeof(struct timer_rand_state), GFP_KERNEL);
 	if (state)
-		irq_timer_state[irq] = state;
+		desc->timer_rand_state = state;
 }
 
 #ifdef CONFIG_BLOCK

Index: linux-2.6/include/linux/irq.h
===================================================================
@@ -129,6 +129,7 @@ struct irq_chip {
 	const char	*typename;
 };
 
+struct timer_rand_state;
 /**
  * struct irq_desc - interrupt descriptor
  *

@@ -158,6 +159,7 @@ struct irq_desc {
 	unsigned int		irq;
 	struct irq_desc		*next;
 #endif
+	struct timer_rand_state *timer_rand_state;
 	irq_flow_handler_t	handle_irq;
 	struct irq_chip		*chip;
 	struct msi_desc		*msi_desc;

Index: linux-2.6/arch/x86/kernel/io_apic_64.c
===================================================================
@@ -58,10 +58,11 @@
 #define __apicdebuginit(type) static type __init
 
 struct irq_cfg;
-
+struct irq_pin_list;
 struct irq_cfg {
 	unsigned int irq;
 	struct irq_cfg *next;
+	struct irq_pin_list *irq_2_pin;
 	cpumask_t domain;
 	cpumask_t old_domain;
 	unsigned move_cleanup_count;

@@ -232,13 +233,62 @@ int pin_map_size;
  * between pins and IRQs.
  */
 
-static struct irq_pin_list {
+struct irq_pin_list {
 	short apic, pin;
-	int next;
-} *irq_2_pin;
+	struct irq_pin_list *next;
+};
+
+static struct irq_pin_list *irq_2_pin_head;
+static int nr_irq_2_pin = 32;
+static struct irq_pin_list *irq_2_pin_ptr;
+static void __init irq_2_pin_init_work(void *data)
+{
+	struct dyn_array *da = data;
+	struct irq_pin_list *pin;
+	int i;
+
+	pin = *da->name;
 
-DEFINE_DYN_ARRAY(irq_2_pin, sizeof(struct irq_pin_list), pin_map_size, sizeof(struct irq_pin_list), NULL);
+	for (i = 1; i < *da->nr; i++)
+		pin[i-1].next = &pin[i];
+
+	irq_2_pin_ptr = &pin[0];
+}
+DEFINE_DYN_ARRAY(irq_2_pin_head, sizeof(struct irq_pin_list), nr_irq_2_pin, sizeof(struct irq_pin_list), irq_2_pin_init_work);
+
+static struct irq_pin_list *get_one_free_irq_2_pin(void)
+{
+	struct irq_pin_list *pin;
+	int i;
 
+	pin = irq_2_pin_ptr;
+
+	if (pin) {
+		irq_2_pin_ptr = pin->next;
+		pin->next = NULL;
+		return pin;
+	}
+
+	/*
+	 *  we run out of pre-allocate ones, allocate more
+	 */
+	printk(KERN_DEBUG "try to get more irq_2_pin %d\n", nr_irq_2_pin);
+
+	if (after_bootmem)
+		pin = kzalloc(sizeof(struct irq_pin_list)*nr_irq_2_pin,
+				 GFP_ATOMIC);
+	else
+		pin = __alloc_bootmem_nopanic( sizeof(struct irq_pin_list) *
+				nr_irq_2_pin, PAGE_SIZE, 0);
+
+	for (i = 1; i < nr_irq_2_pin; i++)
+		pin[i-1].next = &pin[i];
+
+	irq_2_pin_ptr = pin->next;
+	pin->next = NULL;
+
+	return pin;
+}
 
 struct io_apic {
 	unsigned int index;

@@ -280,16 +330,17 @@ static bool io_apic_level_ack_pending(un
 {
 	struct irq_pin_list *entry;
 	unsigned long flags;
+	struct irq_cfg *cfg = get_irq_cfg(irq);
 
 	spin_lock_irqsave(&ioapic_lock, flags);
-	entry = irq_2_pin + irq;
+	entry = cfg->irq_2_pin;
 	for (;;) {
 		unsigned int reg;
 		int pin;
 
-		pin = entry->pin;
-		if (pin == -1)
+		if (!entry)
 			break;
+		pin = entry->pin;
 		reg = io_apic_read(entry->apic, 0x10 + pin*2);
 		/* Is the remote IRR bit set? */
 		if (reg & IO_APIC_REDIR_REMOTE_IRR) {

@@ -298,7 +349,7 @@ static bool io_apic_level_ack_pending(un
 		}
 		if (!entry->next)
 			break;
-		entry = irq_2_pin + entry->next;
+		entry = entry->next;
 	}
 	spin_unlock_irqrestore(&ioapic_lock, flags);
 

@@ -319,7 +370,8 @@ static inline void io_apic_sync(unsigned
 									\
 {									\
 	int pin;							\
-	struct irq_pin_list *entry = irq_2_pin + irq;			\
+	struct irq_cfg *cfg = get_irq_cfg(irq);				\
+	struct irq_pin_list *entry = cfg->irq_2_pin;			\
 									\
 	BUG_ON(irq >= nr_irqs);						\
 	for (;;) {							\

@@ -333,7 +385,7 @@ static inline void io_apic_sync(unsigned
 		FINAL;							\
 		if (!entry->next)					\
 			break;						\
-		entry = irq_2_pin + entry->next;			\
+		entry = entry->next;					\
 	}								\
 }
 

@@ -396,15 +448,20 @@ static void ioapic_mask_entry(int apic,
 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
 {
 	int apic, pin;
-	struct irq_pin_list *entry = irq_2_pin + irq;
+	struct irq_cfg *cfg;
+	struct irq_pin_list *entry;
 
 	BUG_ON(irq >= nr_irqs);
+	cfg = get_irq_cfg(irq);
+	entry = cfg->irq_2_pin;
 	for (;;) {
 		unsigned int reg;
+
+		if (!entry)
+			break;
+
 		apic = entry->apic;
 		pin = entry->pin;
-		if (pin == -1)
-			break;
 		/*
 		 * With interrupt-remapping, destination information comes
 		 * from interrupt-remapping table entry.

@@ -417,7 +474,7 @@ static void __target_IO_APIC_irq(unsigne
 		io_apic_modify(apic, reg);
 		if (!entry->next)
 			break;
-		entry = irq_2_pin + entry->next;
+		entry = entry->next;
 	}
 }
 

@@ -460,18 +517,25 @@ static void set_ioapic_affinity_irq(unsi
 int first_free_entry;
 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
 {
-	struct irq_pin_list *entry = irq_2_pin + irq;
+	struct irq_cfg *cfg;
+	struct irq_pin_list *entry;
 
 	BUG_ON(irq >= nr_irqs);
-	while (entry->next)
-		entry = irq_2_pin + entry->next;
+	cfg = get_irq_cfg(irq);
+	entry = cfg->irq_2_pin;
+	if (!entry) {
+		entry = get_one_free_irq_2_pin();
+		cfg->irq_2_pin = entry;
+		entry->apic = apic;
+		entry->pin = pin;
 
-	if (entry->pin != -1) {
-		entry->next = first_free_entry;
-		entry = irq_2_pin + entry->next;
-		if (++first_free_entry >= pin_map_size)
-			panic("io_apic.c: ran out of irq_2_pin entries!");
+		return;
 	}
+	while (entry->next)
+		entry = entry->next;
+
+	entry->next = get_one_free_irq_2_pin();
+	entry = entry->next;
 	entry->apic = apic;
 	entry->pin = pin;
 }

@@ -483,16 +547,16 @@ static void __init replace_pin_at_irq(un
 				      int oldapic, int oldpin,
 				      int newapic, int newpin)
 {
-	struct irq_pin_list *entry = irq_2_pin + irq;
+	struct irq_cfg *cfg = get_irq_cfg(irq);
+	struct irq_pin_list *entry = cfg->irq_2_pin;
 
-	while (1) {
+	while (entry) {
 		if (entry->apic == oldapic && entry->pin == oldpin) {
 			entry->apic = newapic;
 			entry->pin = newpin;
-		}
-		if (!entry->next)
 			break;
-		entry = irq_2_pin + entry->next;
+		}
+		entry = entry->next;
 	}
 }
 

@@ -1297,15 +1361,16 @@ __apicdebuginit(void) print_IO_APIC(void
 	}
 	printk(KERN_DEBUG "IRQ to pin mappings:\n");
 	for (i = 0; i < nr_irqs; i++) {
-		struct irq_pin_list *entry = irq_2_pin + i;
-		if (entry->pin < 0)
+		struct irq_cfg *cfg = get_irq_cfg(i);
+		struct irq_pin_list *entry = cfg->irq_2_pin;
+		if (!entry)
 			continue;
 		printk(KERN_DEBUG "IRQ%d ", i);
 		for (;;) {
 			printk("-> %d:%d", entry->apic, entry->pin);
 			if (!entry->next)
 				break;
-			entry = irq_2_pin + entry->next;
+			entry = entry->next;
 		}
 		printk("\n");
 	}

@@ -1466,14 +1531,9 @@ void __init enable_IO_APIC(void)
 {
 	union IO_APIC_reg_01 reg_01;
 	int i8259_apic, i8259_pin;
-	int i, apic;
+	int apic;
 	unsigned long flags;
 
-	for (i = 0; i < pin_map_size; i++) {
-		irq_2_pin[i].pin = -1;
-		irq_2_pin[i].next = 0;
-	}
-
 	/*
 	 * The number of IO-APIC IRQ registers (== #pins):
 	 */