5 files changed, 73 insertions, 18 deletions

diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index 8ab7ae01773f..b0d4abc55a11 100644
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -2520,17 +2520,21 @@ device_initcall(ioapic_init_sysfs);
 /*
  * Dynamic irq allocate and deallocation
  */
-int create_irq(void)
+unsigned int create_irq_nr(unsigned int irq_want)
 {
         /* Allocate an unused irq */
-        int irq;
-        int new;
+        unsigned int irq;
+        unsigned int new;
         unsigned long flags;
         struct irq_cfg *cfg_new;
 
-        irq = -ENOSPC;
+#ifndef CONFIG_HAVE_SPARSE_IRQ
+        irq_want = nr_irqs - 1;
+#endif
+
+        irq = 0;
         spin_lock_irqsave(&vector_lock, flags);
-        for (new = (nr_irqs - 1); new >= 0; new--) {
+        for (new = irq_want; new > 0; new--) {
                 if (platform_legacy_irq(new))
                         continue;
                 cfg_new = irq_cfg(new);
@@ -2545,12 +2549,24 @@ int create_irq(void)
         }
         spin_unlock_irqrestore(&vector_lock, flags);
 
-        if (irq >= 0) {
+        if (irq > 0) {
                 dynamic_irq_init(irq);
         }
         return irq;
 }
 
+int create_irq(void)
+{
+        int irq;
+
+        irq = create_irq_nr(nr_irqs - 1);
+
+        if (irq == 0)
+                irq = -1;
+
+        return irq;
+}
+
 void destroy_irq(unsigned int irq)
 {
         unsigned long flags;
@@ -2803,13 +2819,29 @@ static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc, int irq)
         return 0;
 }
 
+static unsigned int build_irq_for_pci_dev(struct pci_dev *dev)
+{
+        unsigned int irq;
+
+        irq = dev->bus->number;
+        irq <<= 8;
+        irq |= dev->devfn;
+        irq <<= 12;
+
+        return irq;
+}
+
 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
 {
-        int irq, ret;
+        unsigned int irq;
+        int ret;
+        unsigned int irq_want;
 
-        irq = create_irq();
-        if (irq < 0)
-                return irq;
+        irq_want = build_irq_for_pci_dev(dev) + 0x100;
+
+        irq = create_irq_nr(irq_want);
+        if (irq == 0)
+                return -1;
 
 #ifdef CONFIG_INTR_REMAP
         if (!intr_remapping_enabled)
@@ -2836,18 +2868,22 @@ error:
 
 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
-        int irq, ret, sub_handle;
+        unsigned int irq;
+        int ret, sub_handle;
         struct msi_desc *desc;
+        unsigned int irq_want;
+
 #ifdef CONFIG_INTR_REMAP
         struct intel_iommu *iommu = 0;
         int index = 0;
 #endif
 
+        irq_want = build_irq_for_pci_dev(dev) + 0x100;
         sub_handle = 0;
         list_for_each_entry(desc, &dev->msi_list, list) {
-                irq = create_irq();
-                if (irq < 0)
-                        return irq;
+                irq = create_irq_nr(irq_want--);
+                if (irq == 0)
+                        return -1;
 #ifdef CONFIG_INTR_REMAP
                 if (!intr_remapping_enabled)
                         goto no_ir;
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 7bd841a9c640..348a11168c2b 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -112,7 +112,7 @@ int show_interrupts(struct seq_file *p, void *v)
                 action = desc->action;
                 if (!action && !any_count)
                         goto skip;
-                seq_printf(p, "%3d: ",i);
+                seq_printf(p, "%#x: ",i);
 #ifndef CONFIG_SMP
                 seq_printf(p, "%10u ", kstat_irqs(i));
 #else
diff --git a/drivers/pci/htirq.c b/drivers/pci/htirq.c
index 279c940a0039..7c5aef13fcdb 100644
--- a/drivers/pci/htirq.c
+++ b/drivers/pci/htirq.c
@@ -82,6 +82,18 @@ void unmask_ht_irq(unsigned int irq)
         write_ht_irq_msg(irq, &msg);
 }
 
+static unsigned int build_irq_for_pci_dev(struct pci_dev *dev)
+{
+        unsigned int irq;
+
+        irq = dev->bus->number;
+        irq <<= 8;
+        irq |= dev->devfn;
+        irq <<= 12;
+
+        return irq;
+}
+
 /**
  * __ht_create_irq - create an irq and attach it to a device.
  * @dev: The hypertransport device to find the irq capability on.
@@ -97,7 +109,8 @@ int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)
         u32 data;
         int max_irq;
         int pos;
-        int irq;
+        unsigned int irq;
+        unsigned int irq_want;
 
         pos = pci_find_ht_capability(dev, HT_CAPTYPE_IRQ);
         if (!pos)
@@ -125,8 +138,13 @@ int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)
         cfg->msg.address_lo = 0xffffffff;
         cfg->msg.address_hi = 0xffffffff;
 
+        irq_want= build_irq_for_pci_dev(dev);
+#ifdef CONFIG_HAVE_SPARSE_IRQ
+        irq = create_irq_nr(irq_want + idx);
+#else
         irq = create_irq();
-        if (irq < 0) {
+#endif
+        if (irq == 0) {
                 kfree(cfg);
                 return -EBUSY;
         }
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 72dd739a7f8a..d68c3592fe4a 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -589,7 +589,7 @@ static int show_stat(struct seq_file *p, void *v)
                 }
 
 #ifdef CONFIG_HAVE_SPARSE_IRQ
-                seq_printf(p, " %u:%u", j, per_irq_sum);
+                seq_printf(p, " %#x:%u", j, per_irq_sum);
 #else
                 seq_printf(p, " %u", per_irq_sum);
 #endif
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 788d5a35a580..704136138dc7 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -399,6 +399,7 @@ extern void set_irq_noprobe(unsigned int irq);
 extern void set_irq_probe(unsigned int irq);
 
 /* Handle dynamic irq creation and destruction */
+extern unsigned int create_irq_nr(unsigned int irq_want);
 extern int create_irq(void);
 extern void destroy_irq(unsigned int irq);