[Xen-devel] [PATCH 3/8] ACPI: processor: add __acpi_processor_[un]register_driver helpers.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

From: Tang Liang <liang.tang@xxxxxxxxxx>

This patch implement __acpi_processor_[un]register_driver helper,
so we can registry override processor driver function. Specifically
the Xen processor driver.

By default the values are set to the native one.

Signed-off-by: Tang Liang <liang.tang@xxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 drivers/acpi/processor_driver.c |   35 +++++++++++++++++++++++++++++------
 include/acpi/processor.h        |    6 +++++-
 2 files changed, 34 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 211c078..55f0b89 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -90,6 +90,11 @@ static const struct acpi_device_id processor_device_ids[] = {
 };
 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
 
+int (*__acpi_processor_register_driver)(void) = acpi_processor_register_driver;
+void (*__acpi_processor_unregister_driver)(void) \
+       = acpi_processor_unregister_driver;
+
+
 static struct acpi_driver acpi_processor_driver = {
        .name = "processor",
        .class = ACPI_PROCESSOR_CLASS,
@@ -779,6 +784,22 @@ void acpi_processor_uninstall_hotplug_notify(void)
        unregister_hotcpu_notifier(&acpi_cpu_notifier);
 }
 
+int acpi_processor_register_driver(void)
+{
+       int result = 0;
+
+       result = acpi_bus_register_driver(&acpi_processor_driver);
+       return result;
+}
+
+void acpi_processor_unregister_driver(void)
+{
+       acpi_bus_unregister_driver(&acpi_processor_driver);
+
+       cpuidle_unregister_driver(&acpi_idle_driver);
+
+       return;
+}
 /*
  * We keep the driver loaded even when ACPI is not running.
  * This is needed for the powernow-k8 driver, that works even without
@@ -794,9 +815,11 @@ static int __init acpi_processor_init(void)
 
        memset(&errata, 0, sizeof(errata));
 
-       result = acpi_bus_register_driver(&acpi_processor_driver);
-       if (result < 0)
-               return result;
+       if (__acpi_processor_register_driver) {
+               result = __acpi_processor_register_driver();
+               if (result < 0)
+                       return result;
+       }
 
        acpi_processor_install_hotplug_notify();
 
@@ -809,6 +832,7 @@ static int __init acpi_processor_init(void)
        return 0;
 }
 
+
 static void __exit acpi_processor_exit(void)
 {
        if (acpi_disabled)
@@ -820,9 +844,8 @@ static void __exit acpi_processor_exit(void)
 
        acpi_processor_uninstall_hotplug_notify();
 
-       acpi_bus_unregister_driver(&acpi_processor_driver);
-
-       cpuidle_unregister_driver(&acpi_idle_driver);
+       if (__acpi_processor_unregister_driver)
+               __acpi_processor_unregister_driver();
 
        return;
 }
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index bd99fb6..969cbc9 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -225,6 +225,9 @@ struct acpi_processor_errata {
        } piix4;
 };
 
+extern int (*__acpi_processor_register_driver)(void);
+extern void (*__acpi_processor_unregister_driver)(void);
+
 extern int acpi_processor_preregister_performance(struct
                                                  acpi_processor_performance
                                                  __percpu *performance);
@@ -242,7 +245,8 @@ int acpi_processor_notify_smm(struct module 
*calling_module);
 
 void acpi_processor_install_hotplug_notify(void);
 void acpi_processor_uninstall_hotplug_notify(void);
-
+int acpi_processor_register_driver(void);
+void acpi_processor_unregister_driver(void);
 int acpi_processor_add(struct acpi_device *device);
 int acpi_processor_remove(struct acpi_device *device, int type);
 void acpi_processor_notify(struct acpi_device *device, u32 event);
-- 
1.7.7.3


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