ACPI and driver patches for 2.6.30-rc1

index e8c143c..ddbb7c8 100644
@@ -192,6 +192,7 @@ struct acpi_thermal {
 	struct acpi_handle_list devices;
 	struct thermal_zone_device *thermal_zone;
 	int tz_enabled;
+	int kelvin_offset;
 	struct mutex lock;
 };
 

@@ -581,7 +582,7 @@ static void acpi_thermal_check(void *data)
 }
 
 /* sys I/F for generic thermal sysfs support */
-#define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
+#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 
 static int thermal_get_temp(struct thermal_zone_device *thermal,
 			    unsigned long *temp)

@@ -596,7 +597,7 @@ static int thermal_get_temp(struct thermal_zone_device *thermal,
 	if (result)
 		return result;
 
-	*temp = KELVIN_TO_MILLICELSIUS(tz->temperature);
+	*temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 	return 0;
 }
 

@@ -702,7 +703,8 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 	if (tz->trips.critical.flags.valid) {
 		if (!trip) {
 			*temp = KELVIN_TO_MILLICELSIUS(
-				tz->trips.critical.temperature);
+				tz->trips.critical.temperature,
+				tz->kelvin_offset);
 			return 0;
 		}
 		trip--;

@@ -711,7 +713,8 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 	if (tz->trips.hot.flags.valid) {
 		if (!trip) {
 			*temp = KELVIN_TO_MILLICELSIUS(
-				tz->trips.hot.temperature);
+				tz->trips.hot.temperature,
+				tz->kelvin_offset);
 			return 0;
 		}
 		trip--;

@@ -720,7 +723,8 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 	if (tz->trips.passive.flags.valid) {
 		if (!trip) {
 			*temp = KELVIN_TO_MILLICELSIUS(
-				tz->trips.passive.temperature);
+				tz->trips.passive.temperature,
+				tz->kelvin_offset);
 			return 0;
 		}
 		trip--;

@@ -730,7 +734,8 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 		tz->trips.active[i].flags.valid; i++) {
 		if (!trip) {
 			*temp = KELVIN_TO_MILLICELSIUS(
-				tz->trips.active[i].temperature);
+				tz->trips.active[i].temperature,
+				tz->kelvin_offset);
 			return 0;
 		}
 		trip--;

@@ -745,7 +750,8 @@ static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 
 	if (tz->trips.critical.flags.valid) {
 		*temperature = KELVIN_TO_MILLICELSIUS(
-				tz->trips.critical.temperature);
+				tz->trips.critical.temperature,
+				tz->kelvin_offset);
 		return 0;
 	} else
 		return -EINVAL;

@@ -1334,6 +1340,25 @@ static int acpi_thermal_get_info(struct acpi_thermal *tz)
 	return 0;
 }
 
+/*
+ * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
+ * handles temperature values with a single decimal place. As a consequence,
+ * some implementations use an offset of 273.1 and others use an offset of
+ * 273.2. Try to find out which one is being used, to present the most
+ * accurate and visually appealing number.
+ *
+ * The heuristic below should work for all ACPI thermal zones which have a
+ * critical trip point with a value being a multiple of 0.5 degree Celsius.
+ */
+static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
+{
+	if (tz->trips.critical.flags.valid &&
+	    (tz->trips.critical.temperature % 5) == 1)
+		tz->kelvin_offset = 2731;
+	else
+		tz->kelvin_offset = 2732;
+}
+
 static int acpi_thermal_add(struct acpi_device *device)
 {
 	int result = 0;

@@ -1360,6 +1385,8 @@ static int acpi_thermal_add(struct acpi_device *device)
 	if (result)
 		goto free_memory;
 
+	acpi_thermal_guess_offset(tz);
+
 	result = acpi_thermal_register_thermal_zone(tz);
 	if (result)
 		goto free_memory;

index 0bd48e6..ce2ed3e 100644
@@ -33,7 +33,6 @@
 #include <linux/timex.h>
 #include <linux/io.h>
 #include <linux/acpi.h>
-#include <linux/kernel.h>
 
 #include <asm/msr.h>
 #include <acpi/processor.h>

index e63f2fe..8ff510b 100644
@@ -491,7 +491,6 @@ static int acpi_device_register(struct acpi_device *device,
 	 */
 	INIT_LIST_HEAD(&device->children);
 	INIT_LIST_HEAD(&device->node);
-	INIT_LIST_HEAD(&device->g_list);
 	INIT_LIST_HEAD(&device->wakeup_list);
 
 	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);

@@ -521,11 +520,9 @@ static int acpi_device_register(struct acpi_device *device,
 	}
 	dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 
-	if (device->parent) {
+	if (device->parent)
 		list_add_tail(&device->node, &device->parent->children);
-		list_add_tail(&device->g_list, &device->parent->g_list);
-	} else
-		list_add_tail(&device->g_list, &acpi_device_list);
+
 	if (device->wakeup.flags.valid)
 		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 	mutex_unlock(&acpi_device_lock);

@@ -550,11 +547,8 @@ static int acpi_device_register(struct acpi_device *device,
 	return 0;
   end:
 	mutex_lock(&acpi_device_lock);
-	if (device->parent) {
+	if (device->parent)
 		list_del(&device->node);
-		list_del(&device->g_list);
-	} else
-		list_del(&device->g_list);
 	list_del(&device->wakeup_list);
 	mutex_unlock(&acpi_device_lock);
 	return result;

@@ -563,11 +557,8 @@ static int acpi_device_register(struct acpi_device *device,
 static void acpi_device_unregister(struct acpi_device *device, int type)
 {
 	mutex_lock(&acpi_device_lock);
-	if (device->parent) {
+	if (device->parent)
 		list_del(&device->node);
-		list_del(&device->g_list);
-	} else
-		list_del(&device->g_list);
 
 	list_del(&device->wakeup_list);
 	mutex_unlock(&acpi_device_lock);

index a222851..c34b110 100644
@@ -270,7 +270,6 @@ struct acpi_device {
 	struct list_head children;
 	struct list_head node;
 	struct list_head wakeup_list;
-	struct list_head g_list;
 	struct acpi_device_status status;
 	struct acpi_device_flags flags;
 	struct acpi_device_pnp pnp;

index a5ce4bc..41cf3e7 100644
@@ -271,7 +271,7 @@ static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
 	union acpi_object *hkey = NULL;
 	int i;
 
-	status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, 0,
+	status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
 				      &buffer);
 	if (ACPI_FAILURE(status)) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,

index ab06143..cd4fb75 100644
@@ -79,6 +79,7 @@ module_param(brightness_switch_enabled, bool, 0644);
 static int acpi_video_bus_add(struct acpi_device *device);
 static int acpi_video_bus_remove(struct acpi_device *device, int type);
 static int acpi_video_resume(struct acpi_device *device);
+static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id video_device_ids[] = {
 	{ACPI_VIDEO_HID, 0},

@@ -94,6 +95,7 @@ static struct acpi_driver acpi_video_bus = {
 		.add = acpi_video_bus_add,
 		.remove = acpi_video_bus_remove,
 		.resume = acpi_video_resume,
+		.notify = acpi_video_bus_notify,
 		},
 };
 

@@ -1986,17 +1988,15 @@ static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
 	return acpi_video_bus_DOS(video, 0, 1);
 }
 
-static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
+static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
 {
-	struct acpi_video_bus *video = data;
-	struct acpi_device *device = NULL;
+	struct acpi_video_bus *video = acpi_driver_data(device);
 	struct input_dev *input;
 	int keycode;
 
 	if (!video)
 		return;
 
-	device = video->device;
 	input = video->input;
 
 	switch (event) {

@@ -2127,7 +2127,6 @@ static int acpi_video_resume(struct acpi_device *device)
 
 static int acpi_video_bus_add(struct acpi_device *device)
 {
-	acpi_status status;
 	struct acpi_video_bus *video;
 	struct input_dev *input;
 	int error;

@@ -2169,20 +2168,10 @@ static int acpi_video_bus_add(struct acpi_device *device)
 	acpi_video_bus_get_devices(video, device);
 	acpi_video_bus_start_devices(video);
 
-	status = acpi_install_notify_handler(device->handle,
-					     ACPI_DEVICE_NOTIFY,
-					     acpi_video_bus_notify, video);
-	if (ACPI_FAILURE(status)) {
-		printk(KERN_ERR PREFIX
-				  "Error installing notify handler\n");
-		error = -ENODEV;
-		goto err_stop_video;
-	}
-
 	video->input = input = input_allocate_device();
 	if (!input) {
 		error = -ENOMEM;
-		goto err_uninstall_notify;
+		goto err_stop_video;
 	}
 
 	snprintf(video->phys, sizeof(video->phys),

@@ -2218,9 +2207,6 @@ static int acpi_video_bus_add(struct acpi_device *device)
 
  err_free_input_dev:
 	input_free_device(input);
- err_uninstall_notify:
-	acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
-				   acpi_video_bus_notify);
  err_stop_video:
 	acpi_video_bus_stop_devices(video);
 	acpi_video_bus_put_devices(video);

@@ -2235,7 +2221,6 @@ static int acpi_video_bus_add(struct acpi_device *device)
 
 static int acpi_video_bus_remove(struct acpi_device *device, int type)
 {
-	acpi_status status = 0;
 	struct acpi_video_bus *video = NULL;
 
 

@@ -2245,11 +2230,6 @@ static int acpi_video_bus_remove(struct acpi_device *device, int type)
 	video = acpi_driver_data(device);
 
 	acpi_video_bus_stop_devices(video);
-
-	status = acpi_remove_notify_handler(video->device->handle,
-					    ACPI_DEVICE_NOTIFY,
-					    acpi_video_bus_notify);
-
 	acpi_video_bus_put_devices(video);
 	acpi_video_bus_remove_fs(device);
 

index 05dfdc9..d0d550d 100644
@@ -343,9 +343,6 @@ acpi_system_write_alarm(struct file *file,
 }
 #endif				/* HAVE_ACPI_LEGACY_ALARM */
 
-extern struct list_head acpi_wakeup_device_list;
-extern spinlock_t acpi_device_lock;
-
 static int
 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
 {

@@ -353,7 +350,7 @@ acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
 
 	seq_printf(seq, "Device\tS-state\t  Status   Sysfs node\n");
 
-	spin_lock(&acpi_device_lock);
+	mutex_lock(&acpi_device_lock);
 	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 		struct acpi_device *dev =
 		    container_of(node, struct acpi_device, wakeup_list);

@@ -361,7 +358,6 @@ acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
 
 		if (!dev->wakeup.flags.valid)
 			continue;
-		spin_unlock(&acpi_device_lock);
 
 		ldev = acpi_get_physical_device(dev->handle);
 		seq_printf(seq, "%s\t  S%d\t%c%-8s  ",

@@ -376,9 +372,8 @@ acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
 		seq_printf(seq, "\n");
 		put_device(ldev);
 
-		spin_lock(&acpi_device_lock);
 	}
-	spin_unlock(&acpi_device_lock);
+	mutex_unlock(&acpi_device_lock);
 	return 0;
 }
 

@@ -409,7 +404,7 @@ acpi_system_write_wakeup_device(struct file *file,
 	strbuf[len] = '\0';
 	sscanf(strbuf, "%s", str);
 
-	spin_lock(&acpi_device_lock);
+	mutex_lock(&acpi_device_lock);
 	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 		struct acpi_device *dev =
 		    container_of(node, struct acpi_device, wakeup_list);

@@ -446,7 +441,7 @@ acpi_system_write_wakeup_device(struct file *file,
 			}
 		}
 	}
-	spin_unlock(&acpi_device_lock);
+	mutex_unlock(&acpi_device_lock);
 	return count;
 }
 

index 20c23c0..e63f2fe 100644
@@ -24,7 +24,7 @@ extern struct acpi_device *acpi_root;
 
 static LIST_HEAD(acpi_device_list);
 static LIST_HEAD(acpi_bus_id_list);
-DEFINE_SPINLOCK(acpi_device_lock);
+DEFINE_MUTEX(acpi_device_lock);
 LIST_HEAD(acpi_wakeup_device_list);
 
 struct acpi_device_bus_id{

@@ -500,7 +500,7 @@ static int acpi_device_register(struct acpi_device *device,
 		return -ENOMEM;
 	}
 
-	spin_lock(&acpi_device_lock);
+	mutex_lock(&acpi_device_lock);
 	/*
 	 * Find suitable bus_id and instance number in acpi_bus_id_list
 	 * If failed, create one and link it into acpi_bus_id_list

@@ -528,7 +528,7 @@ static int acpi_device_register(struct acpi_device *device,
 		list_add_tail(&device->g_list, &acpi_device_list);
 	if (device->wakeup.flags.valid)
 		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
-	spin_unlock(&acpi_device_lock);
+	mutex_unlock(&acpi_device_lock);
 
 	if (device->parent)
 		device->dev.parent = &parent->dev;

@@ -549,20 +549,20 @@ static int acpi_device_register(struct acpi_device *device,
 	device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 	return 0;
   end:
-	spin_lock(&acpi_device_lock);
+	mutex_lock(&acpi_device_lock);
 	if (device->parent) {
 		list_del(&device->node);
 		list_del(&device->g_list);
 	} else
 		list_del(&device->g_list);
 	list_del(&device->wakeup_list);
-	spin_unlock(&acpi_device_lock);
+	mutex_unlock(&acpi_device_lock);
 	return result;
 }
 
 static void acpi_device_unregister(struct acpi_device *device, int type)
 {
-	spin_lock(&acpi_device_lock);
+	mutex_lock(&acpi_device_lock);
 	if (device->parent) {
 		list_del(&device->node);
 		list_del(&device->g_list);

@@ -570,7 +570,7 @@ static void acpi_device_unregister(struct acpi_device *device, int type)
 		list_del(&device->g_list);
 
 	list_del(&device->wakeup_list);
-	spin_unlock(&acpi_device_lock);
+	mutex_unlock(&acpi_device_lock);
 
 	acpi_detach_data(device->handle, acpi_bus_data_handler);
 

index cfaf8f5..8a8f3b3 100644
@@ -5,3 +5,6 @@ extern int acpi_suspend (u32 state);
 extern void acpi_enable_wakeup_device_prep(u8 sleep_state);
 extern void acpi_enable_wakeup_device(u8 sleep_state);
 extern void acpi_disable_wakeup_device(u8 sleep_state);
+
+extern struct list_head acpi_wakeup_device_list;
+extern struct mutex acpi_device_lock;

index 5aee8c2..88725dc 100644
@@ -12,12 +12,14 @@
 #include "internal.h"
 #include "sleep.h"
 
+/*
+ * We didn't lock acpi_device_lock in the file, because it invokes oops in
+ * suspend/resume and isn't really required as this is called in S-state. At
+ * that time, there is no device hotplug
+ **/
 #define _COMPONENT		ACPI_SYSTEM_COMPONENT
 ACPI_MODULE_NAME("wakeup_devices")
 
-extern struct list_head acpi_wakeup_device_list;
-extern spinlock_t acpi_device_lock;
-
 /**
  * acpi_enable_wakeup_device_prep - prepare wakeup devices
  *	@sleep_state:	ACPI state

@@ -29,7 +31,6 @@ void acpi_enable_wakeup_device_prep(u8 sleep_state)
 {
 	struct list_head *node, *next;
 
-	spin_lock(&acpi_device_lock);
 	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 		struct acpi_device *dev = container_of(node,
 						       struct acpi_device,

@@ -40,11 +41,8 @@ void acpi_enable_wakeup_device_prep(u8 sleep_state)
 		    (sleep_state > (u32) dev->wakeup.sleep_state))
 			continue;
 
-		spin_unlock(&acpi_device_lock);
 		acpi_enable_wakeup_device_power(dev, sleep_state);
-		spin_lock(&acpi_device_lock);
 	}
-	spin_unlock(&acpi_device_lock);
 }
 
 /**

@@ -60,7 +58,6 @@ void acpi_enable_wakeup_device(u8 sleep_state)
 	 * Caution: this routine must be invoked when interrupt is disabled 
 	 * Refer ACPI2.0: P212
 	 */
-	spin_lock(&acpi_device_lock);
 	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 		struct acpi_device *dev =
 			container_of(node, struct acpi_device, wakeup_list);

@@ -74,22 +71,17 @@ void acpi_enable_wakeup_device(u8 sleep_state)
 		if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
 		    || sleep_state > (u32) dev->wakeup.sleep_state) {
 			if (dev->wakeup.flags.run_wake) {
-				spin_unlock(&acpi_device_lock);
 				/* set_gpe_type will disable GPE, leave it like that */
 				acpi_set_gpe_type(dev->wakeup.gpe_device,
 						  dev->wakeup.gpe_number,
 						  ACPI_GPE_TYPE_RUNTIME);
-				spin_lock(&acpi_device_lock);
 			}
 			continue;
 		}
-		spin_unlock(&acpi_device_lock);
 		if (!dev->wakeup.flags.run_wake)
 			acpi_enable_gpe(dev->wakeup.gpe_device,
 					dev->wakeup.gpe_number);
-		spin_lock(&acpi_device_lock);
 	}
-	spin_unlock(&acpi_device_lock);
 }
 
 /**

@@ -101,7 +93,6 @@ void acpi_disable_wakeup_device(u8 sleep_state)
 {
 	struct list_head *node, *next;
 
-	spin_lock(&acpi_device_lock);
 	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 		struct acpi_device *dev =
 			container_of(node, struct acpi_device, wakeup_list);

@@ -112,19 +103,16 @@ void acpi_disable_wakeup_device(u8 sleep_state)
 		if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
 		    || sleep_state > (u32) dev->wakeup.sleep_state) {
 			if (dev->wakeup.flags.run_wake) {
-				spin_unlock(&acpi_device_lock);
 				acpi_set_gpe_type(dev->wakeup.gpe_device,
 						  dev->wakeup.gpe_number,
 						  ACPI_GPE_TYPE_WAKE_RUN);
 				/* Re-enable it, since set_gpe_type will disable it */
 				acpi_enable_gpe(dev->wakeup.gpe_device,
 						dev->wakeup.gpe_number);
-				spin_lock(&acpi_device_lock);
 			}
 			continue;
 		}
 
-		spin_unlock(&acpi_device_lock);
 		acpi_disable_wakeup_device_power(dev);
 		/* Never disable run-wake GPE */
 		if (!dev->wakeup.flags.run_wake) {

@@ -133,16 +121,14 @@ void acpi_disable_wakeup_device(u8 sleep_state)
 			acpi_clear_gpe(dev->wakeup.gpe_device,
 				       dev->wakeup.gpe_number, ACPI_NOT_ISR);
 		}
-		spin_lock(&acpi_device_lock);
 	}
-	spin_unlock(&acpi_device_lock);
 }
 
 int __init acpi_wakeup_device_init(void)
 {
 	struct list_head *node, *next;
 
-	spin_lock(&acpi_device_lock);
+	mutex_lock(&acpi_device_lock);
 	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 		struct acpi_device *dev = container_of(node,
 						       struct acpi_device,

@@ -150,15 +136,13 @@ int __init acpi_wakeup_device_init(void)
 		/* In case user doesn't load button driver */
 		if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
 			continue;
-		spin_unlock(&acpi_device_lock);
 		acpi_set_gpe_type(dev->wakeup.gpe_device,
 				  dev->wakeup.gpe_number,
 				  ACPI_GPE_TYPE_WAKE_RUN);
 		acpi_enable_gpe(dev->wakeup.gpe_device,
 				dev->wakeup.gpe_number);
 		dev->wakeup.state.enabled = 1;
-		spin_lock(&acpi_device_lock);
 	}
-	spin_unlock(&acpi_device_lock);
+	mutex_unlock(&acpi_device_lock);
 	return 0;
 }

index 10f8796..218b9a1 100644
@@ -174,8 +174,7 @@ struct fujitsu_hotkey_t {
 
 static struct fujitsu_hotkey_t *fujitsu_hotkey;
 
-static void acpi_fujitsu_hotkey_notify(acpi_handle handle, u32 event,
-				       void *data);
+static void acpi_fujitsu_hotkey_notify(struct acpi_device *device, u32 event);
 
 #ifdef CONFIG_LEDS_CLASS
 static enum led_brightness logolamp_get(struct led_classdev *cdev);

@@ -816,7 +815,6 @@ static void acpi_fujitsu_notify(struct acpi_device *device, u32 event)
 
 static int acpi_fujitsu_hotkey_add(struct acpi_device *device)
 {
-	acpi_status status;
 	acpi_handle handle;
 	int result = 0;
 	int state = 0;

@@ -833,17 +831,6 @@ static int acpi_fujitsu_hotkey_add(struct acpi_device *device)
 	sprintf(acpi_device_class(device), "%s", ACPI_FUJITSU_CLASS);
 	device->driver_data = fujitsu_hotkey;
 
-	status = acpi_install_notify_handler(device->handle,
-					     ACPI_DEVICE_NOTIFY,
-					     acpi_fujitsu_hotkey_notify,
-					     fujitsu_hotkey);
-
-	if (ACPI_FAILURE(status)) {
-		printk(KERN_ERR "Error installing notify handler\n");
-		error = -ENODEV;
-		goto err_stop;
-	}
-
 	/* kfifo */
 	spin_lock_init(&fujitsu_hotkey->fifo_lock);
 	fujitsu_hotkey->fifo =

@@ -858,7 +845,7 @@ static int acpi_fujitsu_hotkey_add(struct acpi_device *device)
 	fujitsu_hotkey->input = input = input_allocate_device();
 	if (!input) {
 		error = -ENOMEM;
-		goto err_uninstall_notify;
+		goto err_free_fifo;
 	}
 
 	snprintf(fujitsu_hotkey->phys, sizeof(fujitsu_hotkey->phys),

@@ -954,9 +941,7 @@ static int acpi_fujitsu_hotkey_add(struct acpi_device *device)
 end:
 err_free_input_dev:
 	input_free_device(input);
-err_uninstall_notify:
-	acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
-				   acpi_fujitsu_hotkey_notify);
+err_free_fifo:
 	kfifo_free(fujitsu_hotkey->fifo);
 err_stop:
 

@@ -965,7 +950,6 @@ err_stop:
 
 static int acpi_fujitsu_hotkey_remove(struct acpi_device *device, int type)
 {
-	acpi_status status;
 	struct fujitsu_hotkey_t *fujitsu_hotkey = NULL;
 
 	if (!device || !acpi_driver_data(device))

@@ -973,10 +957,6 @@ static int acpi_fujitsu_hotkey_remove(struct acpi_device *device, int type)
 
 	fujitsu_hotkey = acpi_driver_data(device);
 
-	status = acpi_remove_notify_handler(fujitsu_hotkey->acpi_handle,
-					    ACPI_DEVICE_NOTIFY,
-					    acpi_fujitsu_hotkey_notify);
-
 	fujitsu_hotkey->acpi_handle = NULL;
 
 	kfifo_free(fujitsu_hotkey->fifo);

@@ -984,8 +964,7 @@ static int acpi_fujitsu_hotkey_remove(struct acpi_device *device, int type)
 	return 0;
 }
 
-static void acpi_fujitsu_hotkey_notify(acpi_handle handle, u32 event,
-				       void *data)
+static void acpi_fujitsu_hotkey_notify(struct acpi_device *device, u32 event)
 {
 	struct input_dev *input;
 	int keycode, keycode_r;

@@ -1068,8 +1047,6 @@ static void acpi_fujitsu_hotkey_notify(acpi_handle handle, u32 event,
 		input_sync(input);
 		break;
 	}
-
-	return;
 }
 
 /* Initialization */

@@ -1102,6 +1079,7 @@ static struct acpi_driver acpi_fujitsu_hotkey_driver = {
 	.ops = {
 		.add = acpi_fujitsu_hotkey_add,
 		.remove = acpi_fujitsu_hotkey_remove,
+		.notify = acpi_fujitsu_hotkey_notify,
 		},
 };
 

index a5ce4bc..1a11de0 100644
@@ -176,6 +176,7 @@ enum SINF_BITS { SINF_NUM_BATTERIES = 0,
 static int acpi_pcc_hotkey_add(struct acpi_device *device);
 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
 static int acpi_pcc_hotkey_resume(struct acpi_device *device);
+static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id pcc_device_ids[] = {
 	{ "MAT0012", 0},

@@ -194,6 +195,7 @@ static struct acpi_driver acpi_pcc_driver = {
 				.add =		acpi_pcc_hotkey_add,
 				.remove =	acpi_pcc_hotkey_remove,
 				.resume =       acpi_pcc_hotkey_resume,
+				.notify =	acpi_pcc_hotkey_notify,
 			},
 };
 

@@ -527,9 +529,9 @@ static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 	return;
 }
 
-static void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
+static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
 {
-	struct pcc_acpi *pcc = (struct pcc_acpi *) data;
+	struct pcc_acpi *pcc = acpi_driver_data(device);
 
 	switch (event) {
 	case HKEY_NOTIFY:

@@ -599,7 +601,6 @@ static int acpi_pcc_hotkey_resume(struct acpi_device *device)
 
 static int acpi_pcc_hotkey_add(struct acpi_device *device)
 {
-	acpi_status status;
 	struct pcc_acpi *pcc;
 	int num_sifr, result;
 

@@ -640,22 +641,11 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
 		goto out_sinf;
 	}
 
-	/* initialize hotkey input device */
-	status = acpi_install_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
-					     acpi_pcc_hotkey_notify, pcc);
-
-	if (ACPI_FAILURE(status)) {
-		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
-				  "Error installing notify handler\n"));
-		result = -ENODEV;
-		goto out_input;
-	}
-
 	/* initialize backlight */
 	pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 						   &pcc_backlight_ops);
 	if (IS_ERR(pcc->backlight))
-		goto out_notify;
+		goto out_input;
 
 	if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,

@@ -680,9 +670,6 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
 
 out_backlight:
 	backlight_device_unregister(pcc->backlight);
-out_notify:
-	acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
-				   acpi_pcc_hotkey_notify);
 out_input:
 	input_unregister_device(pcc->input_dev);
 	/* no need to input_free_device() since core input API refcount and

@@ -723,9 +710,6 @@ static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
 
 	backlight_device_unregister(pcc->backlight);
 
-	acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
-				   acpi_pcc_hotkey_notify);
-
 	input_unregister_device(pcc->input_dev);
 	/* no need to input_free_device() since core input API refcount and
 	 * free()s the device */

index b0de631..3c7d894 100644
@@ -903,7 +903,7 @@ static struct acpi_driver acpi_battery_driver = {
 		},
 };
 
-static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
+static void acpi_battery_init_async(void *unused, async_cookie_t cookie)
 {
 	if (acpi_disabled)
 		return;

index 45940f3..10f8796 100644
@@ -203,7 +203,7 @@ struct led_classdev kblamps_led = {
 static u32 dbg_level = 0x03;
 #endif
 
-static void acpi_fujitsu_notify(acpi_handle handle, u32 event, void *data);
+static void acpi_fujitsu_notify(struct acpi_device *device, u32 event);
 
 /* Fujitsu ACPI interface function */
 

@@ -658,7 +658,6 @@ static struct dmi_system_id fujitsu_dmi_table[] = {
 
 static int acpi_fujitsu_add(struct acpi_device *device)
 {
-	acpi_status status;
 	acpi_handle handle;
 	int result = 0;
 	int state = 0;

@@ -673,20 +672,10 @@ static int acpi_fujitsu_add(struct acpi_device *device)
 	sprintf(acpi_device_class(device), "%s", ACPI_FUJITSU_CLASS);
 	device->driver_data = fujitsu;
 
-	status = acpi_install_notify_handler(device->handle,
-					     ACPI_DEVICE_NOTIFY,
-					     acpi_fujitsu_notify, fujitsu);
-
-	if (ACPI_FAILURE(status)) {
-		printk(KERN_ERR "Error installing notify handler\n");
-		error = -ENODEV;
-		goto err_stop;
-	}
-
 	fujitsu->input = input = input_allocate_device();
 	if (!input) {
 		error = -ENOMEM;
-		goto err_uninstall_notify;
+		goto err_stop;
 	}
 
 	snprintf(fujitsu->phys, sizeof(fujitsu->phys),

@@ -743,9 +732,6 @@ static int acpi_fujitsu_add(struct acpi_device *device)
 end:
 err_free_input_dev:
 	input_free_device(input);
-err_uninstall_notify:
-	acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
-				   acpi_fujitsu_notify);
 err_stop:
 
 	return result;

@@ -753,7 +739,6 @@ err_stop:
 
 static int acpi_fujitsu_remove(struct acpi_device *device, int type)
 {
-	acpi_status status;
 	struct fujitsu_t *fujitsu = NULL;
 
 	if (!device || !acpi_driver_data(device))

@@ -761,10 +746,6 @@ static int acpi_fujitsu_remove(struct acpi_device *device, int type)
 
 	fujitsu = acpi_driver_data(device);
 
-	status = acpi_remove_notify_handler(fujitsu->acpi_handle,
-					    ACPI_DEVICE_NOTIFY,
-					    acpi_fujitsu_notify);
-
 	if (!device || !acpi_driver_data(device))
 		return -EINVAL;
 

@@ -775,7 +756,7 @@ static int acpi_fujitsu_remove(struct acpi_device *device, int type)
 
 /* Brightness notify */
 
-static void acpi_fujitsu_notify(acpi_handle handle, u32 event, void *data)
+static void acpi_fujitsu_notify(struct acpi_device *device, u32 event)
 {
 	struct input_dev *input;
 	int keycode;

@@ -829,8 +810,6 @@ static void acpi_fujitsu_notify(acpi_handle handle, u32 event, void *data)
 		input_report_key(input, keycode, 0);
 		input_sync(input);
 	}
-
-	return;
 }
 
 /* ACPI device for hotkey handling */

@@ -1107,6 +1086,7 @@ static struct acpi_driver acpi_fujitsu_driver = {
 	.ops = {
 		.add = acpi_fujitsu_add,
 		.remove = acpi_fujitsu_remove,
+		.notify = acpi_fujitsu_notify,
 		},
 };
 

index e8c143c..0914eaa 100644
@@ -98,6 +98,7 @@ MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
 static int acpi_thermal_add(struct acpi_device *device);
 static int acpi_thermal_remove(struct acpi_device *device, int type);
 static int acpi_thermal_resume(struct acpi_device *device);
+static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);

@@ -123,6 +124,7 @@ static struct acpi_driver acpi_thermal_driver = {
 		.add = acpi_thermal_add,
 		.remove = acpi_thermal_remove,
 		.resume = acpi_thermal_resume,
+		.notify = acpi_thermal_notify,
 		},
 };
 

@@ -1264,17 +1266,14 @@ static int acpi_thermal_remove_fs(struct acpi_device *device)
                                  Driver Interface
    -------------------------------------------------------------------------- */
 
-static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
+static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 {
-	struct acpi_thermal *tz = data;
-	struct acpi_device *device = NULL;
+	struct acpi_thermal *tz = acpi_driver_data(device);
 
 
 	if (!tz)
 		return;
 
-	device = tz->device;
-
 	switch (event) {
 	case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 		acpi_thermal_check(tz);

@@ -1298,8 +1297,6 @@ static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
 				  "Unsupported event [0x%x]\n", event));
 		break;
 	}
-
-	return;
 }
 
 static int acpi_thermal_get_info(struct acpi_thermal *tz)

@@ -1337,7 +1334,6 @@ static int acpi_thermal_get_info(struct acpi_thermal *tz)
 static int acpi_thermal_add(struct acpi_device *device)
 {
 	int result = 0;
-	acpi_status status = AE_OK;
 	struct acpi_thermal *tz = NULL;
 
 

@@ -1368,21 +1364,11 @@ static int acpi_thermal_add(struct acpi_device *device)
 	if (result)
 		goto unregister_thermal_zone;
 
-	status = acpi_install_notify_handler(device->handle,
-					     ACPI_DEVICE_NOTIFY,
-					     acpi_thermal_notify, tz);
-	if (ACPI_FAILURE(status)) {
-		result = -ENODEV;
-		goto remove_fs;
-	}
-
 	printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
 	       acpi_device_name(device), acpi_device_bid(device),
 	       KELVIN_TO_CELSIUS(tz->temperature));
 	goto end;
 
-remove_fs:
-	acpi_thermal_remove_fs(device);
 unregister_thermal_zone:
 	thermal_zone_device_unregister(tz->thermal_zone);
 free_memory:

@@ -1393,7 +1379,6 @@ end:
 
 static int acpi_thermal_remove(struct acpi_device *device, int type)
 {
-	acpi_status status = AE_OK;
 	struct acpi_thermal *tz = NULL;
 
 	if (!device || !acpi_driver_data(device))

@@ -1401,10 +1386,6 @@ static int acpi_thermal_remove(struct acpi_device *device, int type)
 
 	tz = acpi_driver_data(device);
 
-	status = acpi_remove_notify_handler(device->handle,
-					    ACPI_DEVICE_NOTIFY,
-					    acpi_thermal_notify);
-
 	acpi_thermal_remove_fs(device);
 	acpi_thermal_unregister_thermal_zone(tz);
 	mutex_destroy(&tz->lock);

index a90ec5c..d3c92d7 100644
@@ -914,7 +914,7 @@ static struct sony_nc_event sony_127_events[] = {
 /*
  * ACPI callbacks
  */
-static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
+static void sony_nc_notify(struct acpi_device *device, u32 event)
 {
 	u32 ev = event;
 

@@ -933,7 +933,7 @@ static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
 			struct sony_nc_event *key_event;
 
 			if (sony_call_snc_handle(key_handle, 0x200, &result)) {
-				dprintk("sony_acpi_notify, unable to decode"
+				dprintk("sony_nc_notify, unable to decode"
 					" event 0x%.2x 0x%.2x\n", key_handle,
 					ev);
 				/* restore the original event */

@@ -968,7 +968,7 @@ static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
 	} else
 		sony_laptop_report_input_event(ev);
 
-	dprintk("sony_acpi_notify, event: 0x%.2x\n", ev);
+	dprintk("sony_nc_notify, event: 0x%.2x\n", ev);
 	acpi_bus_generate_proc_event(sony_nc_acpi_device, 1, ev);
 }
 

@@ -1276,15 +1276,6 @@ static int sony_nc_add(struct acpi_device *device)
 		goto outwalk;
 	}
 
-	status = acpi_install_notify_handler(sony_nc_acpi_handle,
-					     ACPI_DEVICE_NOTIFY,
-					     sony_acpi_notify, NULL);
-	if (ACPI_FAILURE(status)) {
-		printk(KERN_WARNING DRV_PFX "unable to install notify handler (%u)\n", status);
-		result = -ENODEV;
-		goto outinput;
-	}
-
 	if (acpi_video_backlight_support()) {
 		printk(KERN_INFO DRV_PFX "brightness ignored, must be "
 		       "controlled by ACPI video driver\n");

@@ -1362,13 +1353,6 @@ static int sony_nc_add(struct acpi_device *device)
 	if (sony_backlight_device)
 		backlight_device_unregister(sony_backlight_device);
 
-	status = acpi_remove_notify_handler(sony_nc_acpi_handle,
-					    ACPI_DEVICE_NOTIFY,
-					    sony_acpi_notify);
-	if (ACPI_FAILURE(status))
-		printk(KERN_WARNING DRV_PFX "unable to remove notify handler\n");
-
-      outinput:
 	sony_laptop_remove_input();
 
       outwalk:

@@ -1378,7 +1362,6 @@ static int sony_nc_add(struct acpi_device *device)
 
 static int sony_nc_remove(struct acpi_device *device, int type)
 {
-	acpi_status status;
 	struct sony_nc_value *item;
 
 	if (sony_backlight_device)

@@ -1386,12 +1369,6 @@ static int sony_nc_remove(struct acpi_device *device, int type)
 
 	sony_nc_acpi_device = NULL;
 
-	status = acpi_remove_notify_handler(sony_nc_acpi_handle,
-					    ACPI_DEVICE_NOTIFY,
-					    sony_acpi_notify);
-	if (ACPI_FAILURE(status))
-		printk(KERN_WARNING DRV_PFX "unable to remove notify handler\n");
-
 	for (item = sony_nc_values; item->name; ++item) {
 		device_remove_file(&sony_pf_device->dev, &item->devattr);
 	}

@@ -1425,6 +1402,7 @@ static struct acpi_driver sony_nc_driver = {
 		.add = sony_nc_add,
 		.remove = sony_nc_remove,
 		.resume = sony_nc_resume,
+		.notify = sony_nc_notify,
 		},
 };
 

index 2f269e1..043b208 100644
@@ -81,6 +81,7 @@ static struct wmi_block wmi_blocks;
 
 static int acpi_wmi_remove(struct acpi_device *device, int type);
 static int acpi_wmi_add(struct acpi_device *device);
+static void acpi_wmi_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id wmi_device_ids[] = {
 	{"PNP0C14", 0},

@@ -96,6 +97,7 @@ static struct acpi_driver acpi_wmi_driver = {
 	.ops = {
 		.add = acpi_wmi_add,
 		.remove = acpi_wmi_remove,
+		.notify = acpi_wmi_notify,
 		},
 };
 

@@ -643,12 +645,11 @@ acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
 	}
 }
 
-static void acpi_wmi_notify(acpi_handle handle, u32 event, void *data)
+static void acpi_wmi_notify(struct acpi_device *device, u32 event)
 {
 	struct guid_block *block;
 	struct wmi_block *wblock;
 	struct list_head *p;
-	struct acpi_device *device = data;
 
 	list_for_each(p, &wmi_blocks.list) {
 		wblock = list_entry(p, struct wmi_block, list);

@@ -669,9 +670,6 @@ static void acpi_wmi_notify(acpi_handle handle, u32 event, void *data)
 
 static int acpi_wmi_remove(struct acpi_device *device, int type)
 {
-	acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
-		acpi_wmi_notify);
-
 	acpi_remove_address_space_handler(device->handle,
 				ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
 

@@ -683,13 +681,6 @@ static int __init acpi_wmi_add(struct acpi_device *device)
 	acpi_status status;
 	int result = 0;
 
-	status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
-		acpi_wmi_notify, device);
-	if (ACPI_FAILURE(status)) {
-		printk(KERN_ERR PREFIX "Error installing notify handler\n");
-		return -ENODEV;
-	}
-
 	status = acpi_install_address_space_handler(device->handle,
 						    ACPI_ADR_SPACE_EC,
 						    &acpi_wmi_ec_space_handler,

index bd3c937..7737afb 100644
@@ -90,7 +90,6 @@ static const struct acpi_port_info acpi_protected_ports[] = {
 	{"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
 	{"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
 	{"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
-	{"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP},
 	{"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
 	{"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP},
 	{"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP},

index 340bdbe..9d3af38 100644
@@ -68,6 +68,7 @@ struct acpi_cpufreq_data {
 	unsigned int max_freq;
 	unsigned int resume;
 	unsigned int cpu_feature;
+	u64 saved_aperf, saved_mperf;
 };
 
 static DEFINE_PER_CPU(struct acpi_cpufreq_data *, drv_data);

@@ -259,9 +260,6 @@ static long read_measured_perf_ctrs(void *_cur)
 	rdmsr(MSR_IA32_APERF, cur->aperf.split.lo, cur->aperf.split.hi);
 	rdmsr(MSR_IA32_MPERF, cur->mperf.split.lo, cur->mperf.split.hi);
 
-	wrmsr(MSR_IA32_APERF, 0, 0);
-	wrmsr(MSR_IA32_MPERF, 0, 0);
-
 	return 0;
 }
 

@@ -281,13 +279,20 @@ static long read_measured_perf_ctrs(void *_cur)
 static unsigned int get_measured_perf(struct cpufreq_policy *policy,
 				      unsigned int cpu)
 {
-	struct perf_pair cur;
+	struct perf_pair readin, cur;
 	unsigned int perf_percent;
 	unsigned int retval;
 
-	if (!work_on_cpu(cpu, read_measured_perf_ctrs, &cur))
+	if (!work_on_cpu(cpu, read_measured_perf_ctrs, &readin))
 		return 0;
 
+	cur.aperf.whole = readin.aperf.whole -
+				per_cpu(drv_data, cpu)->saved_aperf;
+	cur.mperf.whole = readin.mperf.whole -
+				per_cpu(drv_data, cpu)->saved_mperf;
+	per_cpu(drv_data, cpu)->saved_aperf = readin.aperf.whole;
+	per_cpu(drv_data, cpu)->saved_mperf = readin.mperf.whole;
+
 #ifdef __i386__
 	/*
 	 * We dont want to do 64 bit divide with 32 bit kernel

index 19f6b9d..340bdbe 100644
@@ -241,23 +241,23 @@ static u32 get_cur_val(const struct cpumask *mask)
 	return cmd.val;
 }
 
-struct perf_cur {
+struct perf_pair {
 	union {
 		struct {
 			u32 lo;
 			u32 hi;
 		} split;
 		u64 whole;
-	} aperf_cur, mperf_cur;
+	} aperf, mperf;
 };
 
 
 static long read_measured_perf_ctrs(void *_cur)
 {
-	struct perf_cur *cur = _cur;
+	struct perf_pair *cur = _cur;
 
-	rdmsr(MSR_IA32_APERF, cur->aperf_cur.split.lo, cur->aperf_cur.split.hi);
-	rdmsr(MSR_IA32_MPERF, cur->mperf_cur.split.lo, cur->mperf_cur.split.hi);
+	rdmsr(MSR_IA32_APERF, cur->aperf.split.lo, cur->aperf.split.hi);
+	rdmsr(MSR_IA32_MPERF, cur->mperf.split.lo, cur->mperf.split.hi);
 
 	wrmsr(MSR_IA32_APERF, 0, 0);
 	wrmsr(MSR_IA32_MPERF, 0, 0);

@@ -281,7 +281,7 @@ static long read_measured_perf_ctrs(void *_cur)
 static unsigned int get_measured_perf(struct cpufreq_policy *policy,
 				      unsigned int cpu)
 {
-	struct perf_cur cur;
+	struct perf_pair cur;
 	unsigned int perf_percent;
 	unsigned int retval;
 

@@ -294,39 +294,37 @@ static unsigned int get_measured_perf(struct cpufreq_policy *policy,
 	 * Get an approximate value. Return failure in case we cannot get
 	 * an approximate value.
 	 */
-	if (unlikely(cur.aperf_cur.split.hi || cur.mperf_cur.split.hi)) {
+	if (unlikely(cur.aperf.split.hi || cur.mperf.split.hi)) {
 		int shift_count;
 		u32 h;
 
-		h = max_t(u32, cur.aperf_cur.split.hi, cur.mperf_cur.split.hi);
+		h = max_t(u32, cur.aperf.split.hi, cur.mperf.split.hi);
 		shift_count = fls(h);
 
-		cur.aperf_cur.whole >>= shift_count;
-		cur.mperf_cur.whole >>= shift_count;
+		cur.aperf.whole >>= shift_count;
+		cur.mperf.whole >>= shift_count;
 	}
 
-	if (((unsigned long)(-1) / 100) < cur.aperf_cur.split.lo) {
+	if (((unsigned long)(-1) / 100) < cur.aperf.split.lo) {
 		int shift_count = 7;
-		cur.aperf_cur.split.lo >>= shift_count;
-		cur.mperf_cur.split.lo >>= shift_count;
+		cur.aperf.split.lo >>= shift_count;
+		cur.mperf.split.lo >>= shift_count;
 	}
 
-	if (cur.aperf_cur.split.lo && cur.mperf_cur.split.lo)
-		perf_percent = (cur.aperf_cur.split.lo * 100) /
-				cur.mperf_cur.split.lo;
+	if (cur.aperf.split.lo && cur.mperf.split.lo)
+		perf_percent = (cur.aperf.split.lo * 100) / cur.mperf.split.lo;
 	else
 		perf_percent = 0;
 
 #else
-	if (unlikely(((unsigned long)(-1) / 100) < cur.aperf_cur.whole)) {
+	if (unlikely(((unsigned long)(-1) / 100) < cur.aperf.whole)) {
 		int shift_count = 7;
-		cur.aperf_cur.whole >>= shift_count;
-		cur.mperf_cur.whole >>= shift_count;
+		cur.aperf.whole >>= shift_count;
+		cur.mperf.whole >>= shift_count;
 	}
 
-	if (cur.aperf_cur.whole && cur.mperf_cur.whole)
-		perf_percent = (cur.aperf_cur.whole * 100) /
-				cur.mperf_cur.whole;
+	if (cur.aperf.whole && cur.mperf.whole)
+		perf_percent = (cur.aperf.whole * 100) / cur.mperf.whole;
 	else
 		perf_percent = 0;
 

index 0beba0d..bb83b1c 100644
@@ -154,6 +154,7 @@
  * CPUID levels like 0x6, 0xA etc
  */
 #define X86_FEATURE_IDA		(7*32+ 0) /* Intel Dynamic Acceleration */
+#define X86_FEATURE_ARAT	(7*32+ 1) /* Always Running APIC Timer */
 
 /* Virtualization flags: Linux defined */
 #define X86_FEATURE_TPR_SHADOW  (8*32+ 0) /* Intel TPR Shadow */

index 098ec84..f287092 100644
@@ -431,6 +431,12 @@ static void __cpuinit setup_APIC_timer(void)
 {
 	struct clock_event_device *levt = &__get_cpu_var(lapic_events);
 
+	if (cpu_has(&current_cpu_data, X86_FEATURE_ARAT)) {
+		lapic_clockevent.features &= ~CLOCK_EVT_FEAT_C3STOP;
+		/* Make LAPIC timer preferrable over percpu HPET */
+		lapic_clockevent.rating = 150;
+	}
+
 	memcpy(levt, &lapic_clockevent, sizeof(*levt));
 	levt->cpumask = cpumask_of(smp_processor_id());
 

index 8220ae6..c965e52 100644
@@ -31,6 +31,7 @@ void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
 
 	static const struct cpuid_bit __cpuinitconst cpuid_bits[] = {
 		{ X86_FEATURE_IDA, CR_EAX, 1, 0x00000006 },
+		{ X86_FEATURE_ARAT, CR_EAX, 2, 0x00000006 },
 		{ 0, 0, 0, 0 }
 	};
 

index 4e6e758..6fe1214 100644
@@ -145,6 +145,9 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr,
 	struct acpi_processor_power *pwr = &pr->power;
 	u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
 
+	if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))
+		return;
+
 	/*
 	 * Check, if one of the previous states already marked the lapic
 	 * unstable