1 files changed, 11 insertions, 14 deletions

diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index 39d9a5fa907e..3b329af4afc5 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -351,8 +351,8 @@ static inline void rotate_irqs_among_cpus(unsigned long useful_load_threshold)
 {
         int i, j;
         Dprintk("Rotating IRQs among CPUs.\n");
-        for (i = 0; i < NR_CPUS; i++) {
-                for (j = 0; cpu_online(i) && (j < NR_IRQS); j++) {
+        for_each_online_cpu(i) {
+                for (j = 0; j < NR_IRQS; j++) {
                         if (!irq_desc[j].action)
                                 continue;
                         /* Is it a significant load ?  */
@@ -381,7 +381,7 @@ static void do_irq_balance(void)
         unsigned long imbalance = 0;
         cpumask_t allowed_mask, target_cpu_mask, tmp;
 
-        for (i = 0; i < NR_CPUS; i++) {
+        for_each_possible_cpu(i) {
                 int package_index;
                 CPU_IRQ(i) = 0;
                 if (!cpu_online(i))
@@ -422,9 +422,7 @@ static void do_irq_balance(void)
                 }
         }
         /* Find the least loaded processor package */
-        for (i = 0; i < NR_CPUS; i++) {
-                if (!cpu_online(i))
-                        continue;
+        for_each_online_cpu(i) {
                 if (i != CPU_TO_PACKAGEINDEX(i))
                         continue;
                 if (min_cpu_irq > CPU_IRQ(i)) {
@@ -441,9 +439,7 @@ tryanothercpu:
          */
         tmp_cpu_irq = 0;
         tmp_loaded = -1;
-        for (i = 0; i < NR_CPUS; i++) {
-                if (!cpu_online(i))
-                        continue;
+        for_each_online_cpu(i) {
                 if (i != CPU_TO_PACKAGEINDEX(i))
                         continue;
                 if (max_cpu_irq <= CPU_IRQ(i)) 
@@ -619,9 +615,7 @@ static int __init balanced_irq_init(void)
         if (smp_num_siblings > 1 && !cpus_empty(tmp))
                 physical_balance = 1;
 
-        for (i = 0; i < NR_CPUS; i++) {
-                if (!cpu_online(i))
-                        continue;
+        for_each_online_cpu(i) {
                 irq_cpu_data[i].irq_delta = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
                 irq_cpu_data[i].last_irq = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
                 if (irq_cpu_data[i].irq_delta == NULL || irq_cpu_data[i].last_irq == NULL) {
@@ -638,9 +632,11 @@ static int __init balanced_irq_init(void)
         else 
                 printk(KERN_ERR "balanced_irq_init: failed to spawn balanced_irq");
 failed:
-        for (i = 0; i < NR_CPUS; i++) {
+        for_each_possible_cpu(i) {
                 kfree(irq_cpu_data[i].irq_delta);
+                irq_cpu_data[i].irq_delta = NULL;
                 kfree(irq_cpu_data[i].last_irq);
+                irq_cpu_data[i].last_irq = NULL;
         }
         return 0;
 }
@@ -1761,7 +1757,8 @@ static void __init setup_ioapic_ids_from_mpc(void)
          * Don't check I/O APIC IDs for xAPIC systems.  They have
          * no meaning without the serial APIC bus.
          */
-        if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && boot_cpu_data.x86 < 15))
+        if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+                || APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
                 return;
         /*
          * This is broken; anything with a real cpu count has to