6 files changed, 219 insertions, 220 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e022f82cd0d0..f49767716c70 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -64,6 +64,7 @@ config X86
         select HAVE_TEXT_POKE_SMP
         select HAVE_GENERIC_HARDIRQS
         select HAVE_SPARSE_IRQ
+        select SPARSE_IRQ
         select GENERIC_FIND_FIRST_BIT
         select GENERIC_IRQ_PROBE
         select GENERIC_PENDING_IRQ if SMP
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 7b3ca8324b69..9b7273cb2193 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -495,7 +495,7 @@ static inline void default_wait_for_init_deassert(atomic_t *deassert)
         return;
 }
 
-extern struct apic *generic_bigsmp_probe(void);
+extern void generic_bigsmp_probe(void);
 
 
 #ifdef CONFIG_X86_LOCAL_APIC
diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index 7e50f06393aa..4b4448761e88 100644
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -160,19 +160,11 @@ static inline int invalid_vm86_irq(int irq)
 #define IO_APIC_VECTOR_LIMIT            ( 32 * MAX_IO_APICS )
 
 #ifdef CONFIG_X86_IO_APIC
-# ifdef CONFIG_SPARSE_IRQ
-#  define CPU_VECTOR_LIMIT              (64 * NR_CPUS)
-#  define NR_IRQS                                       \
+# define CPU_VECTOR_LIMIT               (64 * NR_CPUS)
+# define NR_IRQS                                        \
         (CPU_VECTOR_LIMIT > IO_APIC_VECTOR_LIMIT ?      \
                 (NR_VECTORS + CPU_VECTOR_LIMIT)  :      \
                 (NR_VECTORS + IO_APIC_VECTOR_LIMIT))
-# else
-#  define CPU_VECTOR_LIMIT              (32 * NR_CPUS)
-#  define NR_IRQS                                       \
-        (CPU_VECTOR_LIMIT < IO_APIC_VECTOR_LIMIT ?      \
-                (NR_VECTORS + CPU_VECTOR_LIMIT)  :      \
-                (NR_VECTORS + IO_APIC_VECTOR_LIMIT))
-# endif
 #else /* !CONFIG_X86_IO_APIC: */
 # define NR_IRQS                        NR_IRQS_LEGACY
 #endif
diff --git a/arch/x86/kernel/apic/bigsmp_32.c b/arch/x86/kernel/apic/bigsmp_32.c
index efd737e827f4..521bead01137 100644
--- a/arch/x86/kernel/apic/bigsmp_32.c
+++ b/arch/x86/kernel/apic/bigsmp_32.c
@@ -255,12 +255,24 @@ static struct apic apic_bigsmp = {
         .x86_32_early_logical_apicid    = bigsmp_early_logical_apicid,
 };
 
-struct apic * __init generic_bigsmp_probe(void)
+void __init generic_bigsmp_probe(void)
 {
-        if (probe_bigsmp())
-                return &apic_bigsmp;
+        unsigned int cpu;
 
-        return NULL;
+        if (!probe_bigsmp())
+                return;
+
+        apic = &apic_bigsmp;
+
+        for_each_possible_cpu(cpu) {
+                if (early_per_cpu(x86_cpu_to_logical_apicid,
+                                  cpu) == BAD_APICID)
+                        continue;
+                early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
+                        bigsmp_early_logical_apicid(cpu);
+        }
+
+        pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
 }
 
 apic_driver(apic_bigsmp);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 229e19f3eb57..3c31fa98af6d 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -92,21 +92,21 @@ static struct ioapic {
         DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
 } ioapics[MAX_IO_APICS];
 
-#define mpc_ioapic_ver(id)              ioapics[id].mp_config.apicver
+#define mpc_ioapic_ver(ioapic_idx)      ioapics[ioapic_idx].mp_config.apicver
 
-int mpc_ioapic_id(int id)
+int mpc_ioapic_id(int ioapic_idx)
 {
-        return ioapics[id].mp_config.apicid;
+        return ioapics[ioapic_idx].mp_config.apicid;
 }
 
-unsigned int mpc_ioapic_addr(int id)
+unsigned int mpc_ioapic_addr(int ioapic_idx)
 {
-        return ioapics[id].mp_config.apicaddr;
+        return ioapics[ioapic_idx].mp_config.apicaddr;
 }
 
-struct mp_ioapic_gsi *mp_ioapic_gsi_routing(int id)
+struct mp_ioapic_gsi *mp_ioapic_gsi_routing(int ioapic_idx)
 {
-        return &ioapics[id].gsi_config;
+        return &ioapics[ioapic_idx].gsi_config;
 }
 
 int nr_ioapics;
@@ -186,11 +186,7 @@ static struct irq_pin_list *alloc_irq_pin_list(int node)
 
 
 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
-#ifdef CONFIG_SPARSE_IRQ
 static struct irq_cfg irq_cfgx[NR_IRQS_LEGACY];
-#else
-static struct irq_cfg irq_cfgx[NR_IRQS];
-#endif
 
 int __init arch_early_irq_init(void)
 {
@@ -234,7 +230,6 @@ int __init arch_early_irq_init(void)
         return 0;
 }
 
-#ifdef CONFIG_SPARSE_IRQ
 static struct irq_cfg *irq_cfg(unsigned int irq)
 {
         return irq_get_chip_data(irq);
@@ -269,22 +264,6 @@ static void free_irq_cfg(unsigned int at, struct irq_cfg *cfg)
         kfree(cfg);
 }
 
-#else
-
-struct irq_cfg *irq_cfg(unsigned int irq)
-{
-        return irq < nr_irqs ? irq_cfgx + irq : NULL;
-}
-
-static struct irq_cfg *alloc_irq_cfg(unsigned int irq, int node)
-{
-        return irq_cfgx + irq;
-}
-
-static inline void free_irq_cfg(unsigned int at, struct irq_cfg *cfg) { }
-
-#endif
-
 static struct irq_cfg *alloc_irq_and_cfg_at(unsigned int at, int node)
 {
         int res = irq_alloc_desc_at(at, node);
@@ -802,13 +781,13 @@ int restore_ioapic_entries(void)
 /*
  * Find the IRQ entry number of a certain pin.
  */
-static int find_irq_entry(int apic, int pin, int type)
+static int find_irq_entry(int ioapic_idx, int pin, int type)
 {
         int i;
 
         for (i = 0; i < mp_irq_entries; i++)
                 if (mp_irqs[i].irqtype == type &&
-                    (mp_irqs[i].dstapic == mpc_ioapic_id(apic) ||
+                    (mp_irqs[i].dstapic == mpc_ioapic_id(ioapic_idx) ||
                      mp_irqs[i].dstapic == MP_APIC_ALL) &&
                     mp_irqs[i].dstirq == pin)
                         return i;
@@ -847,12 +826,13 @@ static int __init find_isa_irq_apic(int irq, int type)
                     (mp_irqs[i].srcbusirq == irq))
                         break;
         }
+
         if (i < mp_irq_entries) {
-                int apic;
-                for(apic = 0; apic < nr_ioapics; apic++) {
-                        if (mpc_ioapic_id(apic) == mp_irqs[i].dstapic)
-                                return apic;
-                }
+                int ioapic_idx;
+
+                for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
+                        if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic)
+                                return ioapic_idx;
         }
 
         return -1;
@@ -1067,7 +1047,7 @@ static int pin_2_irq(int idx, int apic, int pin)
 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin,
                                 struct io_apic_irq_attr *irq_attr)
 {
-        int apic, i, best_guess = -1;
+        int ioapic_idx, i, best_guess = -1;
 
         apic_printk(APIC_DEBUG,
                     "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
@@ -1080,8 +1060,8 @@ int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin,
         for (i = 0; i < mp_irq_entries; i++) {
                 int lbus = mp_irqs[i].srcbus;
 
-                for (apic = 0; apic < nr_ioapics; apic++)
-                        if (mpc_ioapic_id(apic) == mp_irqs[i].dstapic ||
+                for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
+                        if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic ||
                             mp_irqs[i].dstapic == MP_APIC_ALL)
                                 break;
 
@@ -1089,13 +1069,13 @@ int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin,
                     !mp_irqs[i].irqtype &&
                     (bus == lbus) &&
                     (slot == ((mp_irqs[i].srcbusirq >> 2) & 0x1f))) {
-                        int irq = pin_2_irq(i, apic, mp_irqs[i].dstirq);
+                        int irq = pin_2_irq(i, ioapic_idx, mp_irqs[i].dstirq);
 
-                        if (!(apic || IO_APIC_IRQ(irq)))
+                        if (!(ioapic_idx || IO_APIC_IRQ(irq)))
                                 continue;
 
                         if (pin == (mp_irqs[i].srcbusirq & 3)) {
-                                set_io_apic_irq_attr(irq_attr, apic,
+                                set_io_apic_irq_attr(irq_attr, ioapic_idx,
                                                      mp_irqs[i].dstirq,
                                                      irq_trigger(i),
                                                      irq_polarity(i));
@@ -1106,7 +1086,7 @@ int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin,
                          * best-guess fuzzy result for broken mptables.
                          */
                         if (best_guess < 0) {
-                                set_io_apic_irq_attr(irq_attr, apic,
+                                set_io_apic_irq_attr(irq_attr, ioapic_idx,
                                                      mp_irqs[i].dstirq,
                                                      irq_trigger(i),
                                                      irq_polarity(i));
@@ -1344,77 +1324,100 @@ static void ioapic_register_intr(unsigned int irq, struct irq_cfg *cfg,
                                       fasteoi ? "fasteoi" : "edge");
 }
 
-static int setup_ioapic_entry(int apic_id, int irq,
-                              struct IO_APIC_route_entry *entry,
-                              unsigned int destination, int trigger,
-                              int polarity, int vector, int pin)
+
+static int setup_ir_ioapic_entry(int irq,
+                              struct IR_IO_APIC_route_entry *entry,
+                              unsigned int destination, int vector,
+                              struct io_apic_irq_attr *attr)
 {
-        /*
-         * add it to the IO-APIC irq-routing table:
-         */
-        memset(entry,0,sizeof(*entry));
+        int index;
+        struct irte irte;
+        int ioapic_id = mpc_ioapic_id(attr->ioapic);
+        struct intel_iommu *iommu = map_ioapic_to_ir(ioapic_id);
 
-        if (intr_remapping_enabled) {
-                struct intel_iommu *iommu = map_ioapic_to_ir(apic_id);
-                struct irte irte;
-                struct IR_IO_APIC_route_entry *ir_entry =
-                        (struct IR_IO_APIC_route_entry *) entry;
-                int index;
+        if (!iommu) {
+                pr_warn("No mapping iommu for ioapic %d\n", ioapic_id);
+                return -ENODEV;
+        }
 
-                if (!iommu)
-                        panic("No mapping iommu for ioapic %d\n", apic_id);
+        index = alloc_irte(iommu, irq, 1);
+        if (index < 0) {
+                pr_warn("Failed to allocate IRTE for ioapic %d\n", ioapic_id);
+                return -ENOMEM;
+        }
 
-                index = alloc_irte(iommu, irq, 1);
-                if (index < 0)
-                        panic("Failed to allocate IRTE for ioapic %d\n", apic_id);
+        prepare_irte(&irte, vector, destination);
 
-                prepare_irte(&irte, vector, destination);
+        /* Set source-id of interrupt request */
+        set_ioapic_sid(&irte, ioapic_id);
 
-                /* Set source-id of interrupt request */
-                set_ioapic_sid(&irte, apic_id);
+        modify_irte(irq, &irte);
 
-                modify_irte(irq, &irte);
+        apic_printk(APIC_VERBOSE, KERN_DEBUG "IOAPIC[%d]: "
+                "Set IRTE entry (P:%d FPD:%d Dst_Mode:%d "
+                "Redir_hint:%d Trig_Mode:%d Dlvry_Mode:%X "
+                "Avail:%X Vector:%02X Dest:%08X "
+                "SID:%04X SQ:%X SVT:%X)\n",
+                attr->ioapic, irte.present, irte.fpd, irte.dst_mode,
+                irte.redir_hint, irte.trigger_mode, irte.dlvry_mode,
+                irte.avail, irte.vector, irte.dest_id,
+                irte.sid, irte.sq, irte.svt);
+
+        memset(entry, 0, sizeof(*entry));
+
+        entry->index2   = (index >> 15) & 0x1;
+        entry->zero     = 0;
+        entry->format   = 1;
+        entry->index    = (index & 0x7fff);
+        /*
+         * IO-APIC RTE will be configured with virtual vector.
+         * irq handler will do the explicit EOI to the io-apic.
+         */
+        entry->vector   = attr->ioapic_pin;
+        entry->mask     = 0;                    /* enable IRQ */
+        entry->trigger  = attr->trigger;
+        entry->polarity = attr->polarity;
 
-                ir_entry->index2 = (index >> 15) & 0x1;
-                ir_entry->zero = 0;
-                ir_entry->format = 1;
-                ir_entry->index = (index & 0x7fff);
-                /*
-                 * IO-APIC RTE will be configured with virtual vector.
-                 * irq handler will do the explicit EOI to the io-apic.
-                 */
-                ir_entry->vector = pin;
-
-                apic_printk(APIC_VERBOSE, KERN_DEBUG "IOAPIC[%d]: "
-                        "Set IRTE entry (P:%d FPD:%d Dst_Mode:%d "
-                        "Redir_hint:%d Trig_Mode:%d Dlvry_Mode:%X "
-                        "Avail:%X Vector:%02X Dest:%08X "
-                        "SID:%04X SQ:%X SVT:%X)\n",
-                        apic_id, irte.present, irte.fpd, irte.dst_mode,
-                        irte.redir_hint, irte.trigger_mode, irte.dlvry_mode,
-                        irte.avail, irte.vector, irte.dest_id,
-                        irte.sid, irte.sq, irte.svt);
-        } else {
-                entry->delivery_mode = apic->irq_delivery_mode;
-                entry->dest_mode = apic->irq_dest_mode;
-                entry->dest = destination;
-                entry->vector = vector;
-        }
+        /* Mask level triggered irqs.
+         * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
+         */
+        if (attr->trigger)
+                entry->mask = 1;
+
+        return 0;
+}
 
-        entry->mask = 0;                                /* enable IRQ */
-        entry->trigger = trigger;
-        entry->polarity = polarity;
+static int setup_ioapic_entry(int irq, struct IO_APIC_route_entry *entry,
+                               unsigned int destination, int vector,
+                               struct io_apic_irq_attr *attr)
+{
+        if (intr_remapping_enabled)
+                return setup_ir_ioapic_entry(irq,
+                         (struct IR_IO_APIC_route_entry *)entry,
+                         destination, vector, attr);
 
-        /* Mask level triggered irqs.
+        memset(entry, 0, sizeof(*entry));
+
+        entry->delivery_mode = apic->irq_delivery_mode;
+        entry->dest_mode     = apic->irq_dest_mode;
+        entry->dest          = destination;
+        entry->vector        = vector;
+        entry->mask          = 0;                       /* enable IRQ */
+        entry->trigger       = attr->trigger;
+        entry->polarity      = attr->polarity;
+
+        /*
+         * Mask level triggered irqs.
          * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
          */
-        if (trigger)
+        if (attr->trigger)
                 entry->mask = 1;
+
         return 0;
 }
 
-static void setup_ioapic_irq(int apic_id, int pin, unsigned int irq,
-                             struct irq_cfg *cfg, int trigger, int polarity)
+static void setup_ioapic_irq(unsigned int irq, struct irq_cfg *cfg,
+                                struct io_apic_irq_attr *attr)
 {
         struct IO_APIC_route_entry entry;
         unsigned int dest;
@@ -1437,49 +1440,48 @@ static void setup_ioapic_irq(int apic_id, int pin, unsigned int irq,
         apic_printk(APIC_VERBOSE,KERN_DEBUG
                     "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
                     "IRQ %d Mode:%i Active:%i Dest:%d)\n",
-                    apic_id, mpc_ioapic_id(apic_id), pin, cfg->vector,
-                    irq, trigger, polarity, dest);
-
+                    attr->ioapic, mpc_ioapic_id(attr->ioapic), attr->ioapic_pin,
+                    cfg->vector, irq, attr->trigger, attr->polarity, dest);
 
-        if (setup_ioapic_entry(mpc_ioapic_id(apic_id), irq, &entry,
-                               dest, trigger, polarity, cfg->vector, pin)) {
-                printk("Failed to setup ioapic entry for ioapic  %d, pin %d\n",
-                       mpc_ioapic_id(apic_id), pin);
+        if (setup_ioapic_entry(irq, &entry, dest, cfg->vector, attr)) {
+                pr_warn("Failed to setup ioapic entry for ioapic  %d, pin %d\n",
+                        mpc_ioapic_id(attr->ioapic), attr->ioapic_pin);
                 __clear_irq_vector(irq, cfg);
+
                 return;
         }
 
-        ioapic_register_intr(irq, cfg, trigger);
+        ioapic_register_intr(irq, cfg, attr->trigger);
         if (irq < legacy_pic->nr_legacy_irqs)
                 legacy_pic->mask(irq);
 
-        ioapic_write_entry(apic_id, pin, entry);
+        ioapic_write_entry(attr->ioapic, attr->ioapic_pin, entry);
 }
 
-static bool __init io_apic_pin_not_connected(int idx, int apic_id, int pin)
+static bool __init io_apic_pin_not_connected(int idx, int ioapic_idx, int pin)
 {
         if (idx != -1)
                 return false;
 
         apic_printk(APIC_VERBOSE, KERN_DEBUG " apic %d pin %d not connected\n",
-                    mpc_ioapic_id(apic_id), pin);
+                    mpc_ioapic_id(ioapic_idx), pin);
         return true;
 }
 
-static void __init __io_apic_setup_irqs(unsigned int apic_id)
+static void __init __io_apic_setup_irqs(unsigned int ioapic_idx)
 {
         int idx, node = cpu_to_node(0);
         struct io_apic_irq_attr attr;
         unsigned int pin, irq;
 
-        for (pin = 0; pin < ioapics[apic_id].nr_registers; pin++) {
-                idx = find_irq_entry(apic_id, pin, mp_INT);
-                if (io_apic_pin_not_connected(idx, apic_id, pin))
+        for (pin = 0; pin < ioapics[ioapic_idx].nr_registers; pin++) {
+                idx = find_irq_entry(ioapic_idx, pin, mp_INT);
+                if (io_apic_pin_not_connected(idx, ioapic_idx, pin))
                         continue;
 
-                irq = pin_2_irq(idx, apic_id, pin);
+                irq = pin_2_irq(idx, ioapic_idx, pin);
 
-                if ((apic_id > 0) && (irq > 16))
+                if ((ioapic_idx > 0) && (irq > 16))
                         continue;
 
                 /*
@@ -1487,10 +1489,10 @@ static void __init __io_apic_setup_irqs(unsigned int apic_id)
                  * installed and if it returns 1:
                  */
                 if (apic->multi_timer_check &&
-                    apic->multi_timer_check(apic_id, irq))
+                    apic->multi_timer_check(ioapic_idx, irq))
                         continue;
 
-                set_io_apic_irq_attr(&attr, apic_id, pin, irq_trigger(idx),
+                set_io_apic_irq_attr(&attr, ioapic_idx, pin, irq_trigger(idx),
                                      irq_polarity(idx));
 
                 io_apic_setup_irq_pin(irq, node, &attr);
@@ -1499,12 +1501,12 @@ static void __init __io_apic_setup_irqs(unsigned int apic_id)
 
 static void __init setup_IO_APIC_irqs(void)
 {
-        unsigned int apic_id;
+        unsigned int ioapic_idx;
 
         apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
 
-        for (apic_id = 0; apic_id < nr_ioapics; apic_id++)
-                __io_apic_setup_irqs(apic_id);
+        for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
+                __io_apic_setup_irqs(ioapic_idx);
 }
 
 /*
@@ -1514,28 +1516,28 @@ static void __init setup_IO_APIC_irqs(void)
  */
 void setup_IO_APIC_irq_extra(u32 gsi)
 {
-        int apic_id = 0, pin, idx, irq, node = cpu_to_node(0);
+        int ioapic_idx = 0, pin, idx, irq, node = cpu_to_node(0);
         struct io_apic_irq_attr attr;
 
         /*
          * Convert 'gsi' to 'ioapic.pin'.
          */
-        apic_id = mp_find_ioapic(gsi);
-        if (apic_id < 0)
+        ioapic_idx = mp_find_ioapic(gsi);
+        if (ioapic_idx < 0)
                 return;
 
-        pin = mp_find_ioapic_pin(apic_id, gsi);
-        idx = find_irq_entry(apic_id, pin, mp_INT);
+        pin = mp_find_ioapic_pin(ioapic_idx, gsi);
+        idx = find_irq_entry(ioapic_idx, pin, mp_INT);
         if (idx == -1)
                 return;
 
-        irq = pin_2_irq(idx, apic_id, pin);
+        irq = pin_2_irq(idx, ioapic_idx, pin);
 
         /* Only handle the non legacy irqs on secondary ioapics */
-        if (apic_id == 0 || irq < NR_IRQS_LEGACY)
+        if (ioapic_idx == 0 || irq < NR_IRQS_LEGACY)
                 return;
 
-        set_io_apic_irq_attr(&attr, apic_id, pin, irq_trigger(idx),
+        set_io_apic_irq_attr(&attr, ioapic_idx, pin, irq_trigger(idx),
                              irq_polarity(idx));
 
         io_apic_setup_irq_pin_once(irq, node, &attr);
@@ -1544,8 +1546,8 @@ void setup_IO_APIC_irq_extra(u32 gsi)
 /*
  * Set up the timer pin, possibly with the 8259A-master behind.
  */
-static void __init setup_timer_IRQ0_pin(unsigned int apic_id, unsigned int pin,
-                                        int vector)
+static void __init setup_timer_IRQ0_pin(unsigned int ioapic_idx,
+                                         unsigned int pin, int vector)
 {
         struct IO_APIC_route_entry entry;
 
@@ -1576,45 +1578,29 @@ static void __init setup_timer_IRQ0_pin(unsigned int apic_id, unsigned int pin,
         /*
          * Add it to the IO-APIC irq-routing table:
          */
-        ioapic_write_entry(apic_id, pin, entry);
+        ioapic_write_entry(ioapic_idx, pin, entry);
 }
 
-
-__apicdebuginit(void) print_IO_APIC(void)
+__apicdebuginit(void) print_IO_APIC(int ioapic_idx)
 {
-        int apic, i;
+        int i;
         union IO_APIC_reg_00 reg_00;
         union IO_APIC_reg_01 reg_01;
         union IO_APIC_reg_02 reg_02;
         union IO_APIC_reg_03 reg_03;
         unsigned long flags;
-        struct irq_cfg *cfg;
-        unsigned int irq;
-
-        printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
-        for (i = 0; i < nr_ioapics; i++)
-                printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
-                       mpc_ioapic_id(i), ioapics[i].nr_registers);
-
-        /*
-         * We are a bit conservative about what we expect.  We have to
-         * know about every hardware change ASAP.
-         */
-        printk(KERN_INFO "testing the IO APIC.......................\n");
-
-        for (apic = 0; apic < nr_ioapics; apic++) {
 
         raw_spin_lock_irqsave(&ioapic_lock, flags);
-        reg_00.raw = io_apic_read(apic, 0);
-        reg_01.raw = io_apic_read(apic, 1);
+        reg_00.raw = io_apic_read(ioapic_idx, 0);
+        reg_01.raw = io_apic_read(ioapic_idx, 1);
         if (reg_01.bits.version >= 0x10)
-                reg_02.raw = io_apic_read(apic, 2);
+                reg_02.raw = io_apic_read(ioapic_idx, 2);
         if (reg_01.bits.version >= 0x20)
-                reg_03.raw = io_apic_read(apic, 3);
+                reg_03.raw = io_apic_read(ioapic_idx, 3);
         raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 
         printk("\n");
-        printk(KERN_DEBUG "IO APIC #%d......\n", mpc_ioapic_id(apic));
+        printk(KERN_DEBUG "IO APIC #%d......\n", mpc_ioapic_id(ioapic_idx));
         printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
         printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
         printk(KERN_DEBUG ".......    : Delivery Type: %X\n", reg_00.bits.delivery_type);
@@ -1664,7 +1650,7 @@ __apicdebuginit(void) print_IO_APIC(void)
                         struct IO_APIC_route_entry entry;
                         struct IR_IO_APIC_route_entry *ir_entry;
 
-                        entry = ioapic_read_entry(apic, i);
+                        entry = ioapic_read_entry(ioapic_idx, i);
                         ir_entry = (struct IR_IO_APIC_route_entry *) &entry;
                         printk(KERN_DEBUG " %02x %04X ",
                                 i,
@@ -1685,7 +1671,7 @@ __apicdebuginit(void) print_IO_APIC(void)
                 } else {
                         struct IO_APIC_route_entry entry;
 
-                        entry = ioapic_read_entry(apic, i);
+                        entry = ioapic_read_entry(ioapic_idx, i);
                         printk(KERN_DEBUG " %02x %02X  ",
                                 i,
                                 entry.dest
@@ -1703,7 +1689,28 @@ __apicdebuginit(void) print_IO_APIC(void)
                         );
                 }
         }
-        }
+}
+
+__apicdebuginit(void) print_IO_APICs(void)
+{
+        int ioapic_idx;
+        struct irq_cfg *cfg;
+        unsigned int irq;
+
+        printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
+        for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
+                printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
+                       mpc_ioapic_id(ioapic_idx),
+                       ioapics[ioapic_idx].nr_registers);
+
+        /*
+         * We are a bit conservative about what we expect.  We have to
+         * know about every hardware change ASAP.
+         */
+        printk(KERN_INFO "testing the IO APIC.......................\n");
+
+        for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
+                print_IO_APIC(ioapic_idx);
 
         printk(KERN_DEBUG "IRQ to pin mappings:\n");
         for_each_active_irq(irq) {
@@ -1722,8 +1729,6 @@ __apicdebuginit(void) print_IO_APIC(void)
         }
 
         printk(KERN_INFO ".................................... done.\n");
-
-        return;
 }
 
 __apicdebuginit(void) print_APIC_field(int base)
@@ -1917,7 +1922,7 @@ __apicdebuginit(int) print_ICs(void)
                 return 0;
 
         print_local_APICs(show_lapic);
-        print_IO_APIC();
+        print_IO_APICs();
 
         return 0;
 }
@@ -2042,7 +2047,7 @@ void __init setup_ioapic_ids_from_mpc_nocheck(void)
 {
         union IO_APIC_reg_00 reg_00;
         physid_mask_t phys_id_present_map;
-        int apic_id;
+        int ioapic_idx;
         int i;
         unsigned char old_id;
         unsigned long flags;
@@ -2056,21 +2061,20 @@ void __init setup_ioapic_ids_from_mpc_nocheck(void)
         /*
          * Set the IOAPIC ID to the value stored in the MPC table.
          */
-        for (apic_id = 0; apic_id < nr_ioapics; apic_id++) {
-
+        for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) {
                 /* Read the register 0 value */
                 raw_spin_lock_irqsave(&ioapic_lock, flags);
-                reg_00.raw = io_apic_read(apic_id, 0);
+                reg_00.raw = io_apic_read(ioapic_idx, 0);
                 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 
-                old_id = mpc_ioapic_id(apic_id);
+                old_id = mpc_ioapic_id(ioapic_idx);
 
-                if (mpc_ioapic_id(apic_id) >= get_physical_broadcast()) {
+                if (mpc_ioapic_id(ioapic_idx) >= get_physical_broadcast()) {
                         printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
-                                apic_id, mpc_ioapic_id(apic_id));
+                                ioapic_idx, mpc_ioapic_id(ioapic_idx));
                         printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
                                 reg_00.bits.ID);
-                        ioapics[apic_id].mp_config.apicid = reg_00.bits.ID;
+                        ioapics[ioapic_idx].mp_config.apicid = reg_00.bits.ID;
                 }
 
                 /*
@@ -2079,9 +2083,9 @@ void __init setup_ioapic_ids_from_mpc_nocheck(void)
                  * 'stuck on smp_invalidate_needed IPI wait' messages.
                  */
                 if (apic->check_apicid_used(&phys_id_present_map,
-                                            mpc_ioapic_id(apic_id))) {
+                                            mpc_ioapic_id(ioapic_idx))) {
                         printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
-                                apic_id, mpc_ioapic_id(apic_id));
+                                ioapic_idx, mpc_ioapic_id(ioapic_idx));
                         for (i = 0; i < get_physical_broadcast(); i++)
                                 if (!physid_isset(i, phys_id_present_map))
                                         break;
@@ -2090,14 +2094,14 @@ void __init setup_ioapic_ids_from_mpc_nocheck(void)
                         printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
                                 i);
                         physid_set(i, phys_id_present_map);
-                        ioapics[apic_id].mp_config.apicid = i;
+                        ioapics[ioapic_idx].mp_config.apicid = i;
                 } else {
                         physid_mask_t tmp;
-                        apic->apicid_to_cpu_present(mpc_ioapic_id(apic_id),
+                        apic->apicid_to_cpu_present(mpc_ioapic_id(ioapic_idx),
                                                     &tmp);
                         apic_printk(APIC_VERBOSE, "Setting %d in the "
                                         "phys_id_present_map\n",
-                                        mpc_ioapic_id(apic_id));
+                                        mpc_ioapic_id(ioapic_idx));
                         physids_or(phys_id_present_map, phys_id_present_map, tmp);
                 }
 
@@ -2105,35 +2109,35 @@ void __init setup_ioapic_ids_from_mpc_nocheck(void)
                  * We need to adjust the IRQ routing table
                  * if the ID changed.
                  */
-                if (old_id != mpc_ioapic_id(apic_id))
+                if (old_id != mpc_ioapic_id(ioapic_idx))
                         for (i = 0; i < mp_irq_entries; i++)
                                 if (mp_irqs[i].dstapic == old_id)
                                         mp_irqs[i].dstapic
-                                                = mpc_ioapic_id(apic_id);
+                                                = mpc_ioapic_id(ioapic_idx);
 
                 /*
                  * Update the ID register according to the right value
                  * from the MPC table if they are different.
                  */
-                if (mpc_ioapic_id(apic_id) == reg_00.bits.ID)
+                if (mpc_ioapic_id(ioapic_idx) == reg_00.bits.ID)
                         continue;
 
                 apic_printk(APIC_VERBOSE, KERN_INFO
                         "...changing IO-APIC physical APIC ID to %d ...",
-                        mpc_ioapic_id(apic_id));
+                        mpc_ioapic_id(ioapic_idx));
 
-                reg_00.bits.ID = mpc_ioapic_id(apic_id);
+                reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
                 raw_spin_lock_irqsave(&ioapic_lock, flags);
-                io_apic_write(apic_id, 0, reg_00.raw);
+                io_apic_write(ioapic_idx, 0, reg_00.raw);
                 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 
                 /*
                  * Sanity check
                  */
                 raw_spin_lock_irqsave(&ioapic_lock, flags);
-                reg_00.raw = io_apic_read(apic_id, 0);
+                reg_00.raw = io_apic_read(ioapic_idx, 0);
                 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
-                if (reg_00.bits.ID != mpc_ioapic_id(apic_id))
+                if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx))
                         printk("could not set ID!\n");
                 else
                         apic_printk(APIC_VERBOSE, " ok.\n");
@@ -3001,27 +3005,26 @@ static int __init io_apic_bug_finalize(void)
 
 late_initcall(io_apic_bug_finalize);
 
-static void resume_ioapic_id(int ioapic_id)
+static void resume_ioapic_id(int ioapic_idx)
 {
         unsigned long flags;
         union IO_APIC_reg_00 reg_00;
 
-
         raw_spin_lock_irqsave(&ioapic_lock, flags);
-        reg_00.raw = io_apic_read(ioapic_id, 0);
-        if (reg_00.bits.ID != mpc_ioapic_id(ioapic_id)) {
-                reg_00.bits.ID = mpc_ioapic_id(ioapic_id);
-                io_apic_write(ioapic_id, 0, reg_00.raw);
+        reg_00.raw = io_apic_read(ioapic_idx, 0);
+        if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx)) {
+                reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
+                io_apic_write(ioapic_idx, 0, reg_00.raw);
         }
         raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 }
 
 static void ioapic_resume(void)
 {
-        int ioapic_id;
+        int ioapic_idx;
 
-        for (ioapic_id = nr_ioapics - 1; ioapic_id >= 0; ioapic_id--)
-                resume_ioapic_id(ioapic_id);
+        for (ioapic_idx = nr_ioapics - 1; ioapic_idx >= 0; ioapic_idx--)
+                resume_ioapic_id(ioapic_idx);
 
         restore_ioapic_entries();
 }
@@ -3558,26 +3561,25 @@ io_apic_setup_irq_pin(unsigned int irq, int node, struct io_apic_irq_attr *attr)
                 return -EINVAL;
         ret = __add_pin_to_irq_node(cfg, node, attr->ioapic, attr->ioapic_pin);
         if (!ret)
-                setup_ioapic_irq(attr->ioapic, attr->ioapic_pin, irq, cfg,
-                                 attr->trigger, attr->polarity);
+                setup_ioapic_irq(irq, cfg, attr);
         return ret;
 }
 
 int io_apic_setup_irq_pin_once(unsigned int irq, int node,
                                struct io_apic_irq_attr *attr)
 {
-        unsigned int id = attr->ioapic, pin = attr->ioapic_pin;
+        unsigned int ioapic_idx = attr->ioapic, pin = attr->ioapic_pin;
         int ret;
 
         /* Avoid redundant programming */
-        if (test_bit(pin, ioapics[id].pin_programmed)) {
+        if (test_bit(pin, ioapics[ioapic_idx].pin_programmed)) {
                 pr_debug("Pin %d-%d already programmed\n",
-                         mpc_ioapic_id(id), pin);
+                         mpc_ioapic_id(ioapic_idx), pin);
                 return 0;
         }
         ret = io_apic_setup_irq_pin(irq, node, attr);
         if (!ret)
-                set_bit(pin, ioapics[id].pin_programmed);
+                set_bit(pin, ioapics[ioapic_idx].pin_programmed);
         return ret;
 }
 
@@ -3613,7 +3615,6 @@ int get_nr_irqs_gsi(void)
         return nr_irqs_gsi;
 }
 
-#ifdef CONFIG_SPARSE_IRQ
 int __init arch_probe_nr_irqs(void)
 {
         int nr;
@@ -3633,7 +3634,6 @@ int __init arch_probe_nr_irqs(void)
 
         return NR_IRQS_LEGACY;
 }
-#endif
 
 int io_apic_set_pci_routing(struct device *dev, int irq,
                             struct io_apic_irq_attr *irq_attr)
diff --git a/arch/x86/kernel/apic/probe_32.c b/arch/x86/kernel/apic/probe_32.c
index b5254ad044ab..0787bb3412f4 100644
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -200,14 +200,8 @@ void __init default_setup_apic_routing(void)
          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
          */
 
-        if (!cmdline_apic && apic == &apic_default) {
-                struct apic *bigsmp = generic_bigsmp_probe();
-                if (bigsmp) {
-                        apic = bigsmp;
-                        printk(KERN_INFO "Overriding APIC driver with %s\n",
-                               apic->name);
-                }
-        }
+        if (!cmdline_apic && apic == &apic_default)
+                generic_bigsmp_probe();
 #endif
 
         if (apic->setup_apic_routing)