ACPI: Fix references to impossible processors.

ACPI uses NR_CPUS in various loops and in some it accesses per cpu
data of processors that are not present and that will never be present.

Make ACPI use nr_cpu_ids instead. That stops at the end of the possible
processors. However, it would be better to use the cpu_possible_map.

The problem may still occur if processor are that are possible occur
after some that are impossible. nr_cpu_ids just deals with the common
case that only the first N processors are populated.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 drivers/acpi/processor_core.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

Index: linux-2.6/drivers/acpi/processor_core.c
===================================================================
--- linux-2.6.orig/drivers/acpi/processor_core.c	2007-11-17 18:00:41.626522978 -0800
+++ linux-2.6/drivers/acpi/processor_core.c	2007-11-17 18:01:32.425522630 -0800
@@ -494,7 +494,7 @@ static int get_cpu_id(acpi_handle handle
 	if (apic_id == -1)
 		return apic_id;
 
-	for (i = 0; i < NR_CPUS; ++i) {
+	for (i = 0; i < nr_cpu_ids; ++i) {
 		if (cpu_physical_id(i) == apic_id)
 			return i;
 	}
@@ -638,7 +638,7 @@ static int __cpuinit acpi_processor_star
 		return 0;
 	}
 
-	BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
+	BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 
 	/*
 	 * Buggy BIOS check
@@ -771,7 +771,7 @@ static int acpi_processor_remove(struct 
 
 	pr = acpi_driver_data(device);
 
-	if (pr->id >= NR_CPUS) {
+	if (pr->id >= nr_cpu_ids) {
 		kfree(pr);
 		return 0;
 	}
@@ -842,7 +842,7 @@ int acpi_processor_device_add(acpi_handl
 	if (!pr)
 		return -ENODEV;
 
-	if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
+	if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
 		kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 	}
 	return 0;
@@ -880,13 +880,13 @@ acpi_processor_hotplug_notify(acpi_handl
 			break;
 		}
 
-		if (pr->id >= 0 && (pr->id < NR_CPUS)) {
+		if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
 			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 			break;
 		}
 
 		result = acpi_processor_start(device);
-		if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
+		if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
 			kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 		} else {
 			printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
@@ -909,7 +909,7 @@ acpi_processor_hotplug_notify(acpi_handl
 			return;
 		}
 
-		if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
+		if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
 			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 		break;
 	default: