ACPI / processor: Initialize per_cpu(processors, pr->id) properly
Commit ac212b6 (ACPI / processor: Use common hotplug infrastructure)
forgot about initializing the per-CPU 'processors' variables which
lead to ACPI cpuidle failure to use C-states and caused boot slowdown
on multi-CPU machines.
Fix the problem by adding per_cpu(processors, pr->id) initialization
to acpi_processor_add() and add make acpi_processor_remove() clean it
up as appropriate.
Also modify acpi_processor_stop() so that it doesn't clear
per_cpu(processors, pr->id) on processor driver removal which would
then cause problems to happen when the driver is loaded again.
This version of the patch contains fixes from Yinghai Lu.
Reported-and-tested-by: Yinghai Lu <yinghai@kernel.org>
Reported-and-tested-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 587d2af..cae2641 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -29,6 +29,9 @@
ACPI_MODULE_NAME("processor");
+DEFINE_PER_CPU(struct acpi_processor *, processors);
+EXPORT_PER_CPU_SYMBOL(processors);
+
/* --------------------------------------------------------------------------
Errata Handling
-------------------------------------------------------------------------- */
@@ -387,6 +390,7 @@
* checks.
*/
per_cpu(processor_device_array, pr->id) = device;
+ per_cpu(processors, pr->id) = pr;
dev = get_cpu_device(pr->id);
ACPI_HANDLE_SET(dev, pr->handle);
@@ -407,6 +411,7 @@
err:
free_cpumask_var(pr->throttling.shared_cpu_map);
device->driver_data = NULL;
+ per_cpu(processors, pr->id) = NULL;
err_free_pr:
kfree(pr);
return result;
@@ -441,6 +446,7 @@
/* Clean up. */
per_cpu(processor_device_array, pr->id) = NULL;
+ per_cpu(processors, pr->id) = NULL;
try_offline_node(cpu_to_node(pr->id));
/* Remove the CPU. */