ACPI: Do not count processor objects for non-present CPUs

(Thanks to Dominik Brodowski)

drivers/acpi/processor.c

@@ -1560,7 +1560,7 @@ acpi_processor_get_info (
 	acpi_status		status = 0;
 	union acpi_object	object = {0};
 	struct acpi_buffer	buffer = {sizeof(union acpi_object), &object};
-	static int		cpu_count = 0;
+	static int		cpu_index = 0;
 
 	ACPI_FUNCTION_TRACE("acpi_processor_get_info");
 
@@ -1570,6 +1570,13 @@ acpi_processor_get_info (
 	if (num_online_cpus() > 1)
 		errata.smp = TRUE;
 
+	/*
+	 *  Extra Processor objects may be enumerated on MP systems with
+	 *  less than the max # of CPUs. They should be ignored.
+	 */
+	if ((cpu_index + 1) > num_online_cpus())
+		return_VALUE(-ENODEV);
+
 	acpi_processor_errata(pr);
 
 	/*
@@ -1601,7 +1608,7 @@ acpi_processor_get_info (
 	 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 	 *	>>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 	 */
-	pr->id = cpu_count++;
+	pr->id = cpu_index++;
 	pr->acpi_id = object.processor.proc_id;
 
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,