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>

1 files changed, 0 insertions, 5 deletions

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index ac28f18823b3..d93963f1e8f4 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -78,9 +78,6 @@ static struct device_driver acpi_processor_driver = {
         .remove = acpi_processor_stop,
 };
 
-DEFINE_PER_CPU(struct acpi_processor *, processors);
-EXPORT_PER_CPU_SYMBOL(processors);
-
 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 {
         struct acpi_device *device = data;
@@ -268,8 +265,6 @@ static int acpi_processor_stop(struct device *dev)
                 thermal_cooling_device_unregister(pr->cdev);
                 pr->cdev = NULL;
         }
-
-        per_cpu(processors, pr->id) = NULL;
         return 0;
 }