[PATCH] powerpc: Remove all usages of NO_IRQ

@@ -61,7 +61,7 @@ struct machdep_calls {
 
 	void		(*init_IRQ)(void);
 
-	/* Return an irq, or NO_IRQ to indicate there are none pending. */
+	/* Return an irq, or 0 to indicate there are none pending. */
 	unsigned int	(*get_irq)(void);
 
 	/* PCI stuff */

@@ -122,9 +122,9 @@ static inline void mpic_msgr_set_destination(struct mpic_msgr *msgr,
  * @msgr:	the message register whose IRQ is to be returned
  *
  * Returns the IRQ number associated with the given message register.
- * NO_IRQ is returned if this message register is not capable of
- * receiving interrupts.  What message register can and cannot receive
- * interrupts is specified in the device tree for the system.
+ * 0 is returned if this message register is not capable of receiving
+ * interrupts.  What message register can and cannot receive interrupts is
+ * specified in the device tree for the system.
  */
 static inline int mpic_msgr_get_irq(struct mpic_msgr *msgr)
 {

@@ -28,7 +28,7 @@ static int parport_pc_find_nonpci_ports (int autoirq, int autodma)
 		io1 = prop[1]; io2 = prop[2];
 
 		virq = irq_of_parse_and_map(np, 0);
-		if (virq == NO_IRQ)
+		if (!virq)
 			continue;
 
 		if (parport_pc_probe_port(io1, io2, virq, autodma, NULL, 0)

@@ -227,7 +227,7 @@ int ibmebus_request_irq(u32 ist, irq_handler_t handler,
 {
 	unsigned int irq = irq_create_mapping(NULL, ist);
 
-	if (irq == NO_IRQ)
+	if (!irq)
 		return -EINVAL;
 
 	return request_irq(irq, handler, irq_flags, devname, dev_id);

@@ -514,7 +514,7 @@ void __do_irq(struct pt_regs *regs)
 	may_hard_irq_enable();
 
 	/* And finally process it */
-	if (unlikely(irq == NO_IRQ))
+	if (unlikely(!irq))
 		__this_cpu_inc(irq_stat.spurious_irqs);
 	else
 		generic_handle_irq(irq);

@@ -193,10 +193,10 @@ static int __init add_legacy_soc_port(struct device_node *np,
 	 */
 	if (tsi && !strcmp(tsi->type, "tsi-bridge"))
 		return add_legacy_port(np, -1, UPIO_TSI, addr, addr,
-				       NO_IRQ, legacy_port_flags, 0);
+				       0, legacy_port_flags, 0);
 	else
 		return add_legacy_port(np, -1, UPIO_MEM, addr, addr,
-				       NO_IRQ, legacy_port_flags, 0);
+				       0, legacy_port_flags, 0);
 }
 
 static int __init add_legacy_isa_port(struct device_node *np,

@@ -242,7 +242,7 @@ static int __init add_legacy_isa_port(struct device_node *np,
 
 	/* Add port, irq will be dealt with later */
 	return add_legacy_port(np, index, UPIO_PORT, be32_to_cpu(reg[1]),
-			       taddr, NO_IRQ, legacy_port_flags, 0);
+			       taddr, 0, legacy_port_flags, 0);
 
 }
 

@@ -314,7 +314,7 @@ static int __init add_legacy_pci_port(struct device_node *np,
 	/* Add port, irq will be dealt with later. We passed a translated
 	 * IO port value. It will be fixed up later along with the irq
 	 */
-	return add_legacy_port(np, index, iotype, base, addr, NO_IRQ,
+	return add_legacy_port(np, index, iotype, base, addr, 0,
 			       legacy_port_flags, np != pci_dev);
 }
 #endif

@@ -462,14 +462,14 @@ static void __init fixup_port_irq(int index,
 	DBG("fixup_port_irq(%d)\n", index);
 
 	virq = irq_of_parse_and_map(np, 0);
-	if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) {
+	if (!virq && legacy_serial_infos[index].irq_check_parent) {
 		np = of_get_parent(np);
 		if (np == NULL)
 			return;
 		virq = irq_of_parse_and_map(np, 0);
 		of_node_put(np);
 	}
-	if (virq == NO_IRQ)
+	if (!virq)
 		return;
 
 	port->irq = virq;

@@ -543,7 +543,7 @@ static int __init serial_dev_init(void)
 		struct plat_serial8250_port *port = &legacy_serial_ports[i];
 		struct device_node *np = legacy_serial_infos[i].np;
 
-		if (port->irq == NO_IRQ)
+		if (!port->irq)
 			fixup_port_irq(i, np, port);
 		if (port->iotype == UPIO_PORT)
 			fixup_port_pio(i, np, port);

@@ -360,7 +360,7 @@ static int pci_read_irq_line(struct pci_dev *pci_dev)
 			 line, pin);
 
 		virq = irq_create_mapping(NULL, line);
-		if (virq != NO_IRQ)
+		if (virq)
 			irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
 	} else {
 		pr_debug(" Got one, spec %d cells (0x%08x 0x%08x...) on %s\n",

@@ -369,7 +369,8 @@ static int pci_read_irq_line(struct pci_dev *pci_dev)
 
 		virq = irq_create_of_mapping(&oirq);
 	}
-	if(virq == NO_IRQ) {
+
+	if (!virq) {
 		pr_debug(" Failed to map !\n");
 		return -1;
 	}

@@ -178,7 +178,7 @@ struct pci_dev *of_create_pci_dev(struct device_node *node,
 		dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
 		dev->rom_base_reg = PCI_ROM_ADDRESS;
 		/* Maybe do a default OF mapping here */
-		dev->irq = NO_IRQ;
+		dev->irq = 0;
 	}
 
 	of_pci_parse_addrs(node, dev);

@@ -204,7 +204,7 @@ static void pika_setup_critical_temp(struct device_node *np,
 	i2c_smbus_write_byte_data(client, 3,  0); /* Tlow */
 
 	irq = irq_of_parse_and_map(np, 0);
-	if (irq  == NO_IRQ) {
+	if (!irq) {
 		printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
 		return;
 	}

@@ -97,7 +97,7 @@ cpld_pic_get_irq(int offset, u8 ignore, u8 __iomem *statusp,
 	status |= (ignore | mask);
 
 	if (status == 0xff)
-		return NO_IRQ;
+		return 0;
 
 	cpld_irq = ffz(status) + offset;
 

@@ -110,14 +110,14 @@ static void cpld_pic_cascade(struct irq_desc *desc)
 
 	irq = cpld_pic_get_irq(0, PCI_IGNORE, &cpld_regs->pci_status,
 		&cpld_regs->pci_mask);
-	if (irq != NO_IRQ) {
+	if (irq) {
 		generic_handle_irq(irq);
 		return;
 	}
 
 	irq = cpld_pic_get_irq(8, MISC_IGNORE, &cpld_regs->misc_status,
 		&cpld_regs->misc_mask);
-	if (irq != NO_IRQ) {
+	if (irq) {
 		generic_handle_irq(irq);
 		return;
 	}

@@ -177,7 +177,7 @@ mpc5121_ads_cpld_pic_init(void)
 		goto end;
 
 	cascade_irq = irq_of_parse_and_map(np, 0);
-	if (cascade_irq == NO_IRQ)
+	if (!cascade_irq)
 		goto end;
 
 	/*

@@ -473,7 +473,7 @@ static int mpc512x_lpbfifo_probe(struct platform_device *pdev)
 	}
 
 	lpbfifo.irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
-	if (lpbfifo.irq == NO_IRQ) {
+	if (!lpbfifo.irq) {
 		dev_err(&pdev->dev, "mapping irq failed\n");
 		ret = -ENODEV;
 		goto err0;

@@ -511,7 +511,7 @@ unsigned int mpc52xx_get_irq(void)
 			irq |= (MPC52xx_IRQ_L1_PERP << MPC52xx_IRQ_L1_OFFSET);
 		}
 	} else {
-		return NO_IRQ;
+		return 0;
 	}
 
 	return irq_linear_revmap(mpc52xx_irqhost, irq);

@@ -131,7 +131,7 @@ int __init pq2ads_pci_init_irq(void)
 	}
 
 	irq = irq_of_parse_and_map(np, 0);
-	if (irq == NO_IRQ) {
+	if (!irq) {
 		printk(KERN_ERR "No interrupt in pci pic node.\n");
 		of_node_put(np);
 		goto out;

@@ -89,7 +89,7 @@ static int __init of_fsl_spi_probe(char *type, char *compatible, u32 sysclk,
 			goto err;
 
 		ret = of_irq_to_resource(np, 0, &res[1]);
-		if (ret == NO_IRQ)
+		if (!ret)
 			goto err;
 
 		pdev = platform_device_alloc("mpc83xx_spi", i);

@@ -352,7 +352,7 @@ static int pmc_probe(struct platform_device *ofdev)
 		return -ENODEV;
 
 	pmc_irq = irq_of_parse_and_map(np, 0);
-	if (pmc_irq != NO_IRQ) {
+	if (pmc_irq) {
 		ret = request_irq(pmc_irq, pmc_irq_handler, IRQF_SHARED,
 		                  "pmc", ofdev);
 

@@ -400,7 +400,7 @@ out_syscr:
 out_pmc:
 	iounmap(pmc_regs);
 out:
-	if (pmc_irq != NO_IRQ)
+	if (pmc_irq)
 		free_irq(pmc_irq, ofdev);
 
 	return ret;

@@ -76,7 +76,7 @@ void __init mpc85xx_cpm2_pic_init(void)
 		return;
 	}
 	irq = irq_of_parse_and_map(np, 0);
-	if (irq == NO_IRQ) {
+	if (!irq) {
 		of_node_put(np);
 		printk(KERN_ERR "PIC init: got no IRQ for cpm cascade\n");
 		return;

@@ -196,7 +196,7 @@ static void mpc85xx_8259_cascade_handler(struct irq_desc *desc)
 {
 	unsigned int cascade_irq = i8259_irq();
 
-	if (cascade_irq != NO_IRQ)
+	if (cascade_irq)
 		/* handle an interrupt from the 8259 */
 		generic_handle_irq(cascade_irq);
 

@@ -247,7 +247,7 @@ static int mpc85xx_cds_8259_attach(void)
 	}
 
 	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
-	if (cascade_irq == NO_IRQ) {
+	if (!cascade_irq) {
 		printk(KERN_ERR "Failed to map cascade interrupt\n");
 		return -ENXIO;
 	}

@@ -51,7 +51,7 @@ static void mpc85xx_8259_cascade(struct irq_desc *desc)
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	unsigned int cascade_irq = i8259_irq();
 
-	if (cascade_irq != NO_IRQ) {
+	if (cascade_irq) {
 		generic_handle_irq(cascade_irq);
 	}
 	chip->irq_eoi(&desc->irq_data);

@@ -96,7 +96,7 @@ void __init mpc85xx_ds_pic_init(void)
 	}
 
 	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
-	if (cascade_irq == NO_IRQ) {
+	if (!cascade_irq) {
 		printk(KERN_ERR "Failed to map cascade interrupt\n");
 		return;
 	}

@@ -78,7 +78,7 @@ static inline unsigned int socrates_fpga_pic_get_irq(unsigned int irq)
 			break;
 	}
 	if (i == 3)
-		return NO_IRQ;
+		return 0;
 
 	raw_spin_lock_irqsave(&socrates_fpga_pic_lock, flags);
 	cause = socrates_fpga_pic_read(FPGA_PIC_IRQMASK(i));

@@ -103,7 +103,7 @@ static void socrates_fpga_pic_cascade(struct irq_desc *desc)
 	 */
 	cascade_irq = socrates_fpga_pic_get_irq(irq);
 
-	if (cascade_irq != NO_IRQ)
+	if (cascade_irq)
 		generic_handle_irq(cascade_irq);
 	chip->irq_eoi(&desc->irq_data);
 }

@@ -292,7 +292,7 @@ void socrates_fpga_pic_init(struct device_node *pic)
 
 	for (i = 0; i < 3; i++) {
 		socrates_fpga_irqs[i] = irq_of_parse_and_map(pic, i);
-		if (socrates_fpga_irqs[i] == NO_IRQ) {
+		if (!socrates_fpga_irqs[i]) {
 			pr_warning("FPGA PIC: can't get irq%d.\n", i);
 			continue;
 		}

@@ -22,7 +22,7 @@ static void mpc86xx_8259_cascade(struct irq_desc *desc)
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	unsigned int cascade_irq = i8259_irq();
 
-	if (cascade_irq != NO_IRQ)
+	if (cascade_irq)
 		generic_handle_irq(cascade_irq);
 
 	chip->irq_eoi(&desc->irq_data);

@@ -58,7 +58,7 @@ void __init mpc86xx_init_irq(void)
 	}
 
 	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
-	if (cascade_irq == NO_IRQ) {
+	if (!cascade_irq) {
 		printk(KERN_ERR "Failed to map cascade interrupt\n");
 		return;
 	}

@@ -241,6 +241,6 @@ void __init mpc8xx_pics_init(void)
 	}
 
 	irq = cpm_pic_init();
-	if (irq != NO_IRQ)
+	if (irq)
 		irq_set_chained_handler(irq, cpm_cascade);
 }

@@ -271,7 +271,7 @@ static int axon_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 
 	for_each_pci_msi_entry(entry, dev) {
 		virq = irq_create_direct_mapping(msic->irq_domain);
-		if (virq == NO_IRQ) {
+		if (!virq) {
 			dev_warn(&dev->dev,
 				 "axon_msi: virq allocation failed!\n");
 			return -1;

@@ -293,7 +293,7 @@ static void axon_msi_teardown_msi_irqs(struct pci_dev *dev)
 	dev_dbg(&dev->dev, "axon_msi: tearing down msi irqs\n");
 
 	for_each_pci_msi_entry(entry, dev) {
-		if (entry->irq == NO_IRQ)
+		if (!entry->irq)
 			continue;
 
 		irq_set_msi_desc(entry->irq, NULL);

@@ -375,7 +375,7 @@ static int axon_msi_probe(struct platform_device *device)
 	}
 
 	virq = irq_of_parse_and_map(dn, 0);
-	if (virq == NO_IRQ) {
+	if (!virq) {
 		printk(KERN_ERR "axon_msi: irq parse and map failed for %s\n",
 		       dn->full_name);
 		goto out_free_fifo;

@@ -123,7 +123,7 @@ static void iic_ioexc_cascade(struct irq_desc *desc)
 				unsigned int cirq =
 					irq_linear_revmap(iic_host,
 							  base | cascade);
-				if (cirq != NO_IRQ)
+				if (cirq)
 					generic_handle_irq(cirq);
 			}
 		/* post-ack level interrupts */

@@ -153,10 +153,10 @@ static unsigned int iic_get_irq(void)
 	*(unsigned long *) &pending =
 		in_be64((u64 __iomem *) &iic->regs->pending_destr);
 	if (!(pending.flags & CBE_IIC_IRQ_VALID))
-		return NO_IRQ;
+		return 0;
 	virq = irq_linear_revmap(iic_host, iic_pending_to_hwnum(pending));
-	if (virq == NO_IRQ)
-		return NO_IRQ;
+	if (!virq)
+		return 0;
 	iic->eoi_stack[++iic->eoi_ptr] = pending.prio;
 	BUG_ON(iic->eoi_ptr > 15);
 	return virq;

@@ -198,7 +198,7 @@ static void iic_request_ipi(int msg)
 	int virq;
 
 	virq = irq_create_mapping(iic_host, iic_msg_to_irq(msg));
-	if (virq == NO_IRQ) {
+	if (!virq) {
 		printk(KERN_ERR
 		       "iic: failed to map IPI %s\n", smp_ipi_name[msg]);
 		return;

@@ -353,7 +353,7 @@ static int __init setup_iic(void)
 		cascade |= 1 << IIC_IRQ_CLASS_SHIFT;
 		cascade |= IIC_UNIT_IIC;
 		cascade = irq_create_mapping(iic_host, cascade);
-		if (cascade == NO_IRQ)
+		if (!cascade)
 			continue;
 		/*
 		 * irq_data is a generic pointer that gets passed back

@@ -411,7 +411,7 @@ static void cell_iommu_enable_hardware(struct cbe_iommu *iommu)
 
 	virq = irq_create_mapping(NULL,
 			IIC_IRQ_IOEX_ATI | (iommu->nid << IIC_IRQ_NODE_SHIFT));
-	BUG_ON(virq == NO_IRQ);
+	BUG_ON(!virq);
 
 	ret = request_irq(virq, ioc_interrupt, 0, iommu->name, iommu);
 	BUG_ON(ret);

@@ -385,7 +385,7 @@ static int __init cbe_init_pm_irq(void)
 	for_each_online_node(node) {
 		irq = irq_create_mapping(NULL, IIC_IRQ_IOEX_PMI |
 					       (node << IIC_IRQ_NODE_SHIFT));
-		if (irq == NO_IRQ) {
+		if (!irq) {
 			printk("ERROR: Unable to allocate irq for node %d\n",
 			       node);
 			return -EINVAL;

@@ -412,7 +412,7 @@ void cbe_sync_irq(int node)
 			       IIC_IRQ_IOEX_PMI
 			       | (node << IIC_IRQ_NODE_SHIFT));
 
-	if (irq == NO_IRQ) {
+	if (!irq) {
 		printk(KERN_WARNING "ERROR, unable to get existing irq %d " \
 		"for node %d\n", irq, node);
 		return;

@@ -207,11 +207,11 @@ static void spider_irq_cascade(struct irq_desc *desc)
 
 	cs = in_be32(pic->regs + TIR_CS) >> 24;
 	if (cs == SPIDER_IRQ_INVALID)
-		virq = NO_IRQ;
+		virq = 0;
 	else
 		virq = irq_linear_revmap(pic->host, cs);
 
-	if (virq != NO_IRQ)
+	if (virq)
 		generic_handle_irq(virq);
 
 	chip->irq_eoi(&desc->irq_data);

@@ -245,19 +245,19 @@ static unsigned int __init spider_find_cascade_and_node(struct spider_pic *pic)
 	/* Now do the horrible hacks */
 	tmp = of_get_property(of_node, "#interrupt-cells", NULL);
 	if (tmp == NULL)
-		return NO_IRQ;
+		return 0;
 	intsize = *tmp;
 	imap = of_get_property(of_node, "interrupt-map", &imaplen);
 	if (imap == NULL || imaplen < (intsize + 1))
-		return NO_IRQ;
+		return 0;
 	iic = of_find_node_by_phandle(imap[intsize]);
 	if (iic == NULL)
-		return NO_IRQ;
+		return 0;
 	imap += intsize + 1;
 	tmp = of_get_property(iic, "#interrupt-cells", NULL);
 	if (tmp == NULL) {
 		of_node_put(iic);
-		return NO_IRQ;
+		return 0;
 	}
 	intsize = *tmp;
 	/* Assume unit is last entry of interrupt specifier */

@@ -266,7 +266,7 @@ static unsigned int __init spider_find_cascade_and_node(struct spider_pic *pic)
 	tmp = of_get_property(iic, "ibm,interrupt-server-ranges", NULL);
 	if (tmp == NULL) {
 		of_node_put(iic);
-		return NO_IRQ;
+		return 0;
 	}
 	/* ugly as hell but works for now */
 	pic->node_id = (*tmp) >> 1;

@@ -281,7 +281,7 @@ static unsigned int __init spider_find_cascade_and_node(struct spider_pic *pic)
 				  (pic->node_id << IIC_IRQ_NODE_SHIFT) |
 				  (2 << IIC_IRQ_CLASS_SHIFT) |
 				  unit);
-	if (virq == NO_IRQ)
+	if (!virq)
 		printk(KERN_ERR "spider_pic: failed to map cascade !");
 	return virq;
 }

@@ -318,7 +318,7 @@ static void __init spider_init_one(struct device_node *of_node, int chip,
 
 	/* Hook up the cascade interrupt to the iic and nodeid */
 	virq = spider_find_cascade_and_node(pic);
-	if (virq == NO_IRQ)
+	if (!virq)
 		return;
 	irq_set_handler_data(virq, pic);
 	irq_set_chained_handler(virq, spider_irq_cascade);

@@ -402,7 +402,7 @@ static int spu_request_irqs(struct spu *spu)
 {
 	int ret = 0;
 
-	if (spu->irqs[0] != NO_IRQ) {
+	if (spu->irqs[0]) {
 		snprintf(spu->irq_c0, sizeof (spu->irq_c0), "spe%02d.0",
 			 spu->number);
 		ret = request_irq(spu->irqs[0], spu_irq_class_0,

@@ -410,7 +410,7 @@ static int spu_request_irqs(struct spu *spu)
 		if (ret)
 			goto bail0;
 	}
-	if (spu->irqs[1] != NO_IRQ) {
+	if (spu->irqs[1]) {
 		snprintf(spu->irq_c1, sizeof (spu->irq_c1), "spe%02d.1",
 			 spu->number);
 		ret = request_irq(spu->irqs[1], spu_irq_class_1,

@@ -418,7 +418,7 @@ static int spu_request_irqs(struct spu *spu)
 		if (ret)
 			goto bail1;
 	}
-	if (spu->irqs[2] != NO_IRQ) {
+	if (spu->irqs[2]) {
 		snprintf(spu->irq_c2, sizeof (spu->irq_c2), "spe%02d.2",
 			 spu->number);
 		ret = request_irq(spu->irqs[2], spu_irq_class_2,

@@ -429,10 +429,10 @@ static int spu_request_irqs(struct spu *spu)
 	return 0;
 
 bail2:
-	if (spu->irqs[1] != NO_IRQ)
+	if (spu->irqs[1])
 		free_irq(spu->irqs[1], spu);
 bail1:
-	if (spu->irqs[0] != NO_IRQ)
+	if (spu->irqs[0])
 		free_irq(spu->irqs[0], spu);
 bail0:
 	return ret;

@@ -440,11 +440,11 @@ bail0:
 
 static void spu_free_irqs(struct spu *spu)
 {
-	if (spu->irqs[0] != NO_IRQ)
+	if (spu->irqs[0])
 		free_irq(spu->irqs[0], spu);
-	if (spu->irqs[1] != NO_IRQ)
+	if (spu->irqs[1])
 		free_irq(spu->irqs[1], spu);
-	if (spu->irqs[2] != NO_IRQ)
+	if (spu->irqs[2])
 		free_irq(spu->irqs[2], spu);
 }
 

@@ -105,7 +105,10 @@ static int __init spu_map_interrupts_old(struct spu *spu,
 	spu->irqs[2] = irq_create_mapping(NULL, IIC_IRQ_CLASS_2 | isrc);
 
 	/* Right now, we only fail if class 2 failed */
-	return spu->irqs[2] == NO_IRQ ? -EINVAL : 0;
+	if (!spu->irqs[2])
+		return -EINVAL;
+
+	return 0;
 }
 
 static void __iomem * __init spu_map_prop_old(struct spu *spu,

@@ -191,7 +194,7 @@ static int __init spu_map_interrupts(struct spu *spu, struct device_node *np)
 		pr_debug("  irq %d no 0x%x on %s\n", i, oirq.args[0],
 			 oirq.np->full_name);
 		spu->irqs[i] = irq_create_of_mapping(&oirq);
-		if (spu->irqs[i] == NO_IRQ) {
+		if (!spu->irqs[i]) {
 			pr_debug("spu_new: failed to map it !\n");
 			goto err;
 		}

@@ -202,7 +205,7 @@ err:
 	pr_debug("failed to map irq %x for spu %s\n", *oirq.args,
 		spu->name);
 	for (; i >= 0; i--) {
-		if (spu->irqs[i] != NO_IRQ)
+		if (spu->irqs[i])
 			irq_dispose_mapping(spu->irqs[i]);
 	}
 	return ret;

@@ -368,7 +368,7 @@ static void chrp_8259_cascade(struct irq_desc *desc)
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	unsigned int cascade_irq = i8259_irq();
 
-	if (cascade_irq != NO_IRQ)
+	if (cascade_irq)
 		generic_handle_irq(cascade_irq);
 
 	chip->irq_eoi(&desc->irq_data);

@@ -514,7 +514,7 @@ static void __init chrp_find_8259(void)
 	}
 	if (chrp_mpic != NULL) {
 		cascade_irq = irq_of_parse_and_map(pic, 0);
-		if (cascade_irq == NO_IRQ)
+		if (!cascade_irq)
 			printk(KERN_ERR "i8259: failed to map cascade irq\n");
 		else
 			irq_set_chained_handler(cascade_irq,

@@ -181,7 +181,7 @@ unsigned int flipper_pic_get_irq(void)
 	irq_status = in_be32(io_base + FLIPPER_ICR) &
 		     in_be32(io_base + FLIPPER_IMR);
 	if (irq_status == 0)
-		return NO_IRQ;	/* no more IRQs pending */
+		return 0;	/* no more IRQs pending */
 
 	irq = __ffs(irq_status);
 	return irq_linear_revmap(flipper_irq_host, irq);

@@ -114,7 +114,7 @@ static unsigned int __hlwd_pic_get_irq(struct irq_domain *h)
 	irq_status = in_be32(io_base + HW_BROADWAY_ICR) &
 		     in_be32(io_base + HW_BROADWAY_IMR);
 	if (irq_status == 0)
-		return NO_IRQ;	/* no more IRQs pending */
+		return 0;	/* no more IRQs pending */
 
 	irq = __ffs(irq_status);
 	return irq_linear_revmap(h, irq);

@@ -131,7 +131,7 @@ static void hlwd_pic_irq_cascade(struct irq_desc *desc)
 	raw_spin_unlock(&desc->lock);
 
 	virq = __hlwd_pic_get_irq(irq_domain);
-	if (virq != NO_IRQ)
+	if (virq)
 		generic_handle_irq(virq);
 	else
 		pr_err("spurious interrupt!\n");

@@ -47,7 +47,7 @@ static void mvme5100_8259_cascade(struct irq_desc *desc)
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	unsigned int cascade_irq = i8259_irq();
 
-	if (cascade_irq != NO_IRQ)
+	if (cascade_irq)
 		generic_handle_irq(cascade_irq);
 
 	chip->irq_eoi(&desc->irq_data);

@@ -84,7 +84,7 @@ static void __init mvme5100_pic_init(void)
 	}
 
 	cirq = irq_of_parse_and_map(cp, 0);
-	if (cirq == NO_IRQ) {
+	if (!cirq) {
 		pr_warn("mvme5100_pic_init: no cascade interrupt?\n");
 		return;
 	}

@@ -552,7 +552,7 @@ void maple_pci_irq_fixup(struct pci_dev *dev)
 	    pci_bus_to_host(dev->bus) == u4_pcie) {
 		printk(KERN_DEBUG "Fixup U4 PCIe IRQ\n");
 		dev->irq = irq_create_mapping(NULL, 1);
-		if (dev->irq != NO_IRQ)
+		if (dev->irq)
 			irq_set_irq_type(dev->irq, IRQ_TYPE_LEVEL_LOW);
 	}
 

@@ -562,7 +562,7 @@ void maple_pci_irq_fixup(struct pci_dev *dev)
 	if (dev->vendor == PCI_VENDOR_ID_AMD &&
 	    dev->device == PCI_DEVICE_ID_AMD_8111_IDE &&
 	    (dev->class & 5) != 5) {
-		dev->irq = NO_IRQ;
+		dev->irq = 0;
 	}
 
 	DBG(" <- maple_pci_irq_fixup\n");

@@ -648,7 +648,7 @@ int maple_pci_get_legacy_ide_irq(struct pci_dev *pdev, int channel)
 		return defirq;
 	}
 	irq = irq_of_parse_and_map(np, channel & 0x1);
-	if (irq == NO_IRQ) {
+	if (!irq) {
 		printk("Failed to map onboard IDE interrupt for channel %d\n",
 		       channel);
 		return defirq;

@@ -76,7 +76,7 @@ static int __init pasemi_register_i2c_devices(void)
 			}
 
 			info.irq = irq_of_parse_and_map(node, 0);
-			if (info.irq == NO_IRQ)
+			if (!info.irq)
 				info.irq = -1;
 
 			if (find_i2c_driver(node, &info) < 0)

@@ -68,7 +68,7 @@ static void pasemi_msi_teardown_msi_irqs(struct pci_dev *pdev)
 	pr_debug("pasemi_msi_teardown_msi_irqs, pdev %p\n", pdev);
 
 	for_each_pci_msi_entry(entry, pdev) {
-		if (entry->irq == NO_IRQ)
+		if (!entry->irq)
 			continue;
 
 		hwirq = virq_to_hw(entry->irq);

@@ -109,7 +109,7 @@ static int pasemi_msi_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
 		}
 
 		virq = irq_create_mapping(msi_mpic->irqhost, hwirq);
-		if (virq == NO_IRQ) {
+		if (!virq) {
 			pr_debug("pasemi_msi: failed mapping hwirq 0x%x\n",
 				  hwirq);
 			msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap, hwirq,

@@ -59,7 +59,7 @@ struct mce_regs {
 
 static struct mce_regs mce_regs[MAX_MCE_REGS];
 static int num_mce_regs;
-static int nmi_virq = NO_IRQ;
+static int nmi_virq = 0;
 
 
 static void __noreturn pas_restart(char *cmd)

@@ -264,7 +264,7 @@ static int pas_machine_check_handler(struct pt_regs *regs)
 	srr0 = regs->nip;
 	srr1 = regs->msr;
 
-	if (nmi_virq != NO_IRQ && mpic_get_mcirq() == nmi_virq) {
+	if (nmi_virq && mpic_get_mcirq() == nmi_virq) {
 		printk(KERN_ERR "NMI delivered\n");
 		debugger(regs);
 		mpic_end_irq(irq_get_irq_data(nmi_virq));

@@ -401,7 +401,7 @@ static int kw_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
 {
 	struct pmac_i2c_host_kw *host = bus->hostdata;
 	u8 mode_reg = host->speed;
-	int use_irq = host->irq != NO_IRQ && !bus->polled;
+	int use_irq = host->irq && !bus->polled;
 
 	/* Setup mode & subaddress if any */
 	switch(bus->mode) {

@@ -535,7 +535,7 @@ static struct pmac_i2c_host_kw *__init kw_i2c_host_init(struct device_node *np)
 		break;
 	}	
 	host->irq = irq_of_parse_and_map(np, 0);
-	if (host->irq == NO_IRQ)
+	if (!host->irq)
 		printk(KERN_WARNING
 		       "low_i2c: Failed to map interrupt for %s\n",
 		       np->full_name);

@@ -557,7 +557,7 @@ static struct pmac_i2c_host_kw *__init kw_i2c_host_init(struct device_node *np)
 	 */
 	if (request_irq(host->irq, kw_i2c_irq, IRQF_NO_SUSPEND,
 			"keywest i2c", host))
-		host->irq = NO_IRQ;
+		host->irq = 0;
 
 	printk(KERN_INFO "KeyWest i2c @0x%08x irq %d %s\n",
 	       *addrp, host->irq, np->full_name);

@@ -26,7 +26,7 @@ static irqreturn_t macio_gpio_irq(int irq, void *data)
 static int macio_do_gpio_irq_enable(struct pmf_function *func)
 {
 	unsigned int irq = irq_of_parse_and_map(func->node, 0);
-	if (irq == NO_IRQ)
+	if (!irq)
 		return -EINVAL;
 	return request_irq(irq, macio_gpio_irq, 0, func->node->name, func);
 }

@@ -34,7 +34,7 @@ static int macio_do_gpio_irq_enable(struct pmf_function *func)
 static int macio_do_gpio_irq_disable(struct pmf_function *func)
 {
 	unsigned int irq = irq_of_parse_and_map(func->node, 0);
-	if (irq == NO_IRQ)
+	if (!irq)
 		return -EINVAL;
 	free_irq(irq, func);
 	return 0;

@@ -251,7 +251,7 @@ static unsigned int pmac_pic_get_irq(void)
 	}
 	raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
 	if (unlikely(irq < 0))
-		return NO_IRQ;
+		return 0;
 	return irq_linear_revmap(pmac_pic_host, irq);
 }
 

@@ -389,7 +389,7 @@ static void __init pmac_pic_probe_oldstyle(void)
 		out_le32(&pmac_irq_hw[i]->enable, 0);
 
 	/* Hookup cascade irq */
-	if (slave && pmac_irq_cascade != NO_IRQ)
+	if (slave && pmac_irq_cascade)
 		setup_irq(pmac_irq_cascade, &gatwick_cascade_action);
 
 	printk(KERN_INFO "irq: System has %d possible interrupts\n", max_irqs);

@@ -444,7 +444,7 @@ static void __init pmac_pic_setup_mpic_nmi(struct mpic *mpic)
 	pswitch = of_find_node_by_name(NULL, "programmer-switch");
 	if (pswitch) {
 		nmi_irq = irq_of_parse_and_map(pswitch, 0);
-		if (nmi_irq != NO_IRQ) {
+		if (nmi_irq) {
 			mpic_irq_set_priority(nmi_irq, 9);
 			setup_irq(nmi_irq, &xmon_action);
 		}

@@ -222,7 +222,7 @@ int __init opal_event_init(void)
 		/* Get hardware and virtual IRQ */
 		irq = be32_to_cpup(irqs);
 		virq = irq_create_mapping(NULL, irq);
-		if (virq == NO_IRQ) {
+		if (!virq) {
 			pr_warn("Failed to map irq 0x%x\n", irq);
 			continue;
 		}

@@ -260,7 +260,7 @@ machine_arch_initcall(powernv, opal_event_init);
 int opal_event_request(unsigned int opal_event_nr)
 {
 	if (WARN_ON_ONCE(!opal_event_irqchip.domain))
-		return NO_IRQ;
+		return 0;
 
 	return irq_create_mapping(opal_event_irqchip.domain, opal_event_nr);
 }

@@ -344,7 +344,7 @@ int pnv_cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
 			return (hwirq ? hwirq : -ENOMEM);
 
 		virq = irq_create_mapping(NULL, hwirq);
-		if (virq == NO_IRQ) {
+		if (!virq) {
 			pr_warn("%s: Failed to map cxl mode MSI to linux irq\n",
 				pci_name(pdev));
 			return -ENOMEM;

@@ -374,7 +374,7 @@ void pnv_cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev)
 		return;
 
 	for_each_pci_msi_entry(entry, pdev) {
-		if (entry->irq == NO_IRQ)
+		if (!entry->irq)
 			continue;
 		hwirq = virq_to_hw(entry->irq);
 		irq_set_msi_desc(entry->irq, NULL);

@@ -186,7 +186,7 @@ int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
 			return -ENOSPC;
 		}
 		virq = irq_create_mapping(NULL, phb->msi_base + hwirq);
-		if (virq == NO_IRQ) {
+		if (!virq) {
 			pr_warn("%s: Failed to map MSI to linux irq\n",
 				pci_name(pdev));
 			msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq, 1);

@@ -217,7 +217,7 @@ void pnv_teardown_msi_irqs(struct pci_dev *pdev)
 		return;
 
 	for_each_pci_msi_entry(entry, pdev) {
-		if (entry->irq == NO_IRQ)
+		if (!entry->irq)
 			continue;
 		hwirq = virq_to_hw(entry->irq);
 		irq_set_msi_desc(entry->irq, NULL);

@@ -192,7 +192,7 @@ static int ps3_virq_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
 
 	*virq = irq_create_mapping(NULL, outlet);
 
-	if (*virq == NO_IRQ) {
+	if (!*virq) {
 		FAIL("%s:%d: irq_create_mapping failed: outlet %lu\n",
 			__func__, __LINE__, outlet);
 		result = -ENOMEM;

@@ -339,7 +339,7 @@ int ps3_event_receive_port_setup(enum ps3_cpu_binding cpu, unsigned int *virq)
 	if (result) {
 		FAIL("%s:%d: lv1_construct_event_receive_port failed: %s\n",
 			__func__, __LINE__, ps3_result(result));
-		*virq = NO_IRQ;
+		*virq = 0;
 		return result;
 	}
 

@@ -418,7 +418,7 @@ int ps3_sb_event_receive_port_setup(struct ps3_system_bus_device *dev,
 			" failed: %s\n", __func__, __LINE__,
 			ps3_result(result));
 		ps3_event_receive_port_destroy(*virq);
-		*virq = NO_IRQ;
+		*virq = 0;
 		return result;
 	}
 

@@ -724,12 +724,12 @@ static unsigned int ps3_get_irq(void)
 	asm volatile("cntlzd %0,%1" : "=r" (plug) : "r" (x));
 	plug &= 0x3f;
 
-	if (unlikely(plug == NO_IRQ)) {
+	if (unlikely(!plug)) {
 		DBG("%s:%d: no plug found: thread_id %llu\n", __func__,
 			__LINE__, pd->thread_id);
 		dump_bmp(&per_cpu(ps3_private, 0));
 		dump_bmp(&per_cpu(ps3_private, 1));
-		return NO_IRQ;
+		return 0;
 	}
 
 #if defined(DEBUG)

@@ -91,7 +91,7 @@ static void __init ps3_smp_probe(void)
 			result = smp_request_message_ipi(virqs[i], i);
 
 			if (result)
-				virqs[i] = NO_IRQ;
+				virqs[i] = 0;
 			else
 				ps3_register_ipi_irq(cpu, virqs[i]);
 		}

@@ -112,7 +112,7 @@ void ps3_smp_cleanup_cpu(int cpu)
 	for (i = 0; i < MSG_COUNT; i++) {
 		/* Can't call free_irq from interrupt context. */
 		ps3_event_receive_port_destroy(virqs[i]);
-		virqs[i] = NO_IRQ;
+		virqs[i] = 0;
 	}
 
 	DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);

@@ -284,7 +284,7 @@ fail_alloc_2:
 fail_alloc_1:
 	ps3_spe_irq_destroy(spu->irqs[0]);
 fail_alloc_0:
-	spu->irqs[0] = spu->irqs[1] = spu->irqs[2] = NO_IRQ;
+	spu->irqs[0] = spu->irqs[1] = spu->irqs[2] = 0;
 	return result;
 }
 

@@ -334,7 +334,7 @@ static int ps3_destroy_spu(struct spu *spu)
 	ps3_spe_irq_destroy(spu->irqs[1]);
 	ps3_spe_irq_destroy(spu->irqs[0]);
 
-	spu->irqs[0] = spu->irqs[1] = spu->irqs[2] = NO_IRQ;
+	spu->irqs[0] = spu->irqs[1] = spu->irqs[2] = 0;
 
 	spu_unmap(spu);
 

@@ -34,7 +34,7 @@ void request_event_sources_irqs(struct device_node *np,
 		if (count > 15)
 			break;
 		virqs[count] = irq_create_of_mapping(&oirq);
-		if (virqs[count] == NO_IRQ) {
+		if (!virqs[count]) {
 			pr_err("event-sources: Unable to allocate "
 			       "interrupt number for %s\n",
 			       np->full_name);

@@ -119,7 +119,7 @@ static void rtas_teardown_msi_irqs(struct pci_dev *pdev)
 	struct msi_desc *entry;
 
 	for_each_pci_msi_entry(entry, pdev) {
-		if (entry->irq == NO_IRQ)
+		if (!entry->irq)
 			continue;
 
 		irq_set_msi_desc(entry->irq, NULL);