diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 4615108..490b9a4 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -206,12 +206,6 @@ config ACPI_IPMI
 	  To compile this driver as a module, choose M here:
 	  the module will be called as acpi_ipmi.
 
-config ACPI_HOTPLUG_CPU
-	bool
-	depends on EXPERIMENTAL && ACPI_PROCESSOR && HOTPLUG_CPU
-	select ACPI_CONTAINER
-	default y
-
 config ACPI_PROCESSOR_AGGREGATOR
 	tristate "Processor Aggregator"
 	depends on ACPI_PROCESSOR
@@ -372,6 +366,11 @@ config ACPI_HOTPLUG_DRIVER
 	  To compile this driver as a module, choose M here:
 	  the module will be called acpihp_drv.
 
+config ACPI_HOTPLUG_CPU
+	bool
+	depends on ACPI_HOTPLUG && ACPI_PROCESSOR && HOTPLUG_CPU
+	default y
+
 config ACPI_CONTAINER
 	tristate "Container and Module Devices (EXPERIMENTAL)"
 	depends on ACPI_HOTPLUG
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 110c5ac..25079ca 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -56,6 +56,7 @@
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 #include <acpi/processor.h>
+#include <acpi/acpi_hotplug.h>
 
 #define PREFIX "ACPI: "
 
@@ -76,9 +77,10 @@ MODULE_LICENSE("GPL");
 static int acpi_processor_add(struct acpi_device *device);
 static int acpi_processor_remove(struct acpi_device *device, int type);
 static void acpi_processor_notify(struct acpi_device *device, u32 event);
-static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr);
-static int acpi_processor_handle_eject(struct acpi_processor *pr);
 static int acpi_processor_start(struct acpi_processor *pr);
+#ifdef	CONFIG_ACPI_HOTPLUG_CPU
+static struct acpihp_dev_ops acpi_processor_hp_ops;
+#endif
 
 static const struct acpi_device_id processor_device_ids[] = {
 	{ACPI_PROCESSOR_OBJECT_HID, 0},
@@ -98,13 +100,13 @@ static struct acpi_driver acpi_processor_driver = {
 		.add = acpi_processor_add,
 		.remove = acpi_processor_remove,
 		.notify = acpi_processor_notify,
-		},
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+		.hp_ops = &acpi_processor_hp_ops,
+#endif
+	},
 	.drv.pm = &acpi_processor_pm,
 };
 
-#define INSTALL_NOTIFY_HANDLER		1
-#define UNINSTALL_NOTIFY_HANDLER	2
-
 static DEFINE_PER_CPU(void *, processor_device_array);
 
 DEFINE_PER_CPU(struct acpi_processor *, processors);
@@ -314,15 +316,6 @@ static int acpi_processor_get_info(struct acpi_device *device)
 	pr->id = cpu_index;
 
 	/*
-	 *  Extra Processor objects may be enumerated on MP systems with
-	 *  less than the max # of CPUs. They should be ignored _iff
-	 *  they are physically not present.
-	 */
-	if (pr->id == -1) {
-		if (ACPI_FAILURE(acpi_processor_hotadd_init(pr)))
-			return -ENODEV;
-	}
-	/*
 	 * On some boxes several processors use the same processor bus id.
 	 * But they are located in different scope. For example:
 	 * \_SB.SCK0.CPU0
@@ -649,20 +642,12 @@ static int acpi_processor_remove(struct acpi_device *device, int type)
 		return -EINVAL;
 
 	pr = acpi_driver_data(device);
-	if (pr->id >= nr_cpu_ids)
-		goto free;
-
-	if (type == ACPI_BUS_REMOVAL_EJECT) {
-		if (acpi_processor_handle_eject(pr))
-			return -EINVAL;
-	}
 
 	get_online_cpus();
-	acpi_processor_stop(pr);
+	acpi_processor_stop(device, pr);
 	acpi_processor_unlink(device, pr);
 	put_online_cpus();
 
-free:
 	device->driver_data = NULL;
 	free_cpumask_var(pr->throttling.shared_cpu_map);
 	kfree(pr);
@@ -675,258 +660,160 @@ free:
  * 	Acpi processor hotplug support 				       	    *
  ****************************************************************************/
 
-static int is_processor_present(acpi_handle handle)
+static void acpi_processor_reset(struct acpi_device *device, struct acpi_processor *pr)
 {
-	acpi_status status;
-	unsigned long long sta = 0;
-
-
-	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
-
-	if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
-		return 1;
-
-	/*
-	 * _STA is mandatory for a processor that supports hot plug
-	 */
-	if (status == AE_NOT_FOUND)
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-				"Processor does not support hot plug\n"));
-	else
-		ACPI_EXCEPTION((AE_INFO, status,
-				"Processor Device is not present"));
-	return 0;
+	get_online_cpus();
+	acpi_processor_unlink(device, pr);
+	put_online_cpus();
+	arch_unregister_cpu(pr->id);
+	acpi_unmap_lsapic(pr->id);
+	pr->id = -1;
 }
 
-static
-int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
+static int acpi_processor_get_dev_info(struct acpi_device *device,
+				       struct acpihp_dev_info *info)
 {
-	acpi_handle phandle;
-	struct acpi_device *pdev;
-
-
-	if (acpi_get_parent(handle, &phandle)) {
-		return -ENODEV;
-	}
+	struct acpi_processor *pr;
 
-	if (acpi_bus_get_device(phandle, &pdev)) {
-		return -ENODEV;
-	}
+	if (!device || !acpi_driver_data(device))
+		return -EINVAL;
+	pr = acpi_driver_data(device);
 
-	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
-		return -ENODEV;
-	}
+	info->type = ACPIHP_DEV_TYPE_CPU;
+	if (pr->id >= 0)
+		info->status |= ACPIHP_DEV_STATUS_STARTED;
 
 	return 0;
 }
 
-static void acpi_processor_hotplug_notify(acpi_handle handle,
-					  u32 event, void *data)
+static int acpi_processor_pre_configure(struct acpi_device *device,
+					struct acpihp_cancel_context *ctx)
 {
-	struct acpi_processor *pr;
-	struct acpi_device *device = NULL;
-	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 	int result;
+	struct acpi_processor *pr;
 
-	switch (event) {
-	case ACPI_NOTIFY_BUS_CHECK:
-	case ACPI_NOTIFY_DEVICE_CHECK:
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-		"Processor driver received %s event\n",
-		       (event == ACPI_NOTIFY_BUS_CHECK) ?
-		       "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
-
-		if (!is_processor_present(handle))
-			break;
-
-		if (!acpi_bus_get_device(handle, &device))
-			break;
-
-		result = acpi_processor_device_add(handle, &device);
-		if (result) {
-			printk(KERN_ERR PREFIX "Unable to add the device\n");
-			break;
-		}
-
-		ost_code = ACPI_OST_SC_SUCCESS;
-		break;
-
-	case ACPI_NOTIFY_EJECT_REQUEST:
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-				  "received ACPI_NOTIFY_EJECT_REQUEST\n"));
+	if (!device || !acpi_driver_data(device))
+		return -EINVAL;
+	pr = acpi_driver_data(device);
 
-		if (acpi_bus_get_device(handle, &device)) {
-			printk(KERN_ERR PREFIX
-				    "Device don't exist, dropping EJECT\n");
-			break;
-		}
-		pr = acpi_driver_data(device);
-		if (!pr) {
-			printk(KERN_ERR PREFIX
-				    "Driver data is NULL, dropping EJECT\n");
-			break;
-		}
+	/* Generate CPUID for hot-added CPUs */
+	if (pr->id == -1) {
+		result = acpi_map_lsapic(device->handle, &pr->id);
+		if (result)
+			goto out_unlock;
+		BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
+		result = arch_register_cpu(pr->id);
+		if (result)
+			goto out_unmap;
 
-		/* REVISIT: update when eject is supported */
-		ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
-		break;
+		/*
+		 * CPU got hot-plugged, but cpu_data is not initialized yet.
+		 * Set flag to let acpi_cpu_soft_notify() initialize cpu_data
+		 * by calling acpi_processor_start
+		 */
+		pr->flags.need_hotplug_init = 1;
+		dev_info(&device->dev, "CPU %d got hotplugged\n", pr->id);
+	}
 
-	default:
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-				  "Unsupported event [0x%x]\n", event));
+	return 0;
 
-		/* non-hotplug event; possibly handled by other handler */
-		return;
-	}
+out_unmap:
+	acpi_unmap_lsapic(pr->id);
+	pr->id = -1;
+out_unlock:
+	put_online_cpus();
 
-	/* Inform firmware that the hotplug operation has completed */
-	(void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
-	return;
+	return result;
 }
 
-static acpi_status is_processor_device(acpi_handle handle)
+static int acpi_processor_configure(struct acpi_device *device,
+				    struct acpihp_cancel_context *ctx)
 {
-	struct acpi_device_info *info;
-	char *hid;
-	acpi_status status;
-
-	status = acpi_get_object_info(handle, &info);
-	if (ACPI_FAILURE(status))
-		return status;
-
-	if (info->type == ACPI_TYPE_PROCESSOR) {
-		kfree(info);
-		return AE_OK;	/* found a processor object */
-	}
+	int result;
+	struct acpi_processor *pr;
 
-	if (!(info->valid & ACPI_VALID_HID)) {
-		kfree(info);
-		return AE_ERROR;
-	}
+	if (!device || !acpi_driver_data(device))
+		return -EINVAL;
+	pr = acpi_driver_data(device);
 
-	hid = info->hardware_id.string;
-	if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {
-		kfree(info);
-		return AE_ERROR;
-	}
+	get_online_cpus();
+	result = acpi_processor_link(device, pr);
+	put_online_cpus();
 
-	kfree(info);
-	return AE_OK;	/* found a processor device object */
+	return result;
 }
 
-static acpi_status
-processor_walk_namespace_cb(acpi_handle handle,
-			    u32 lvl, void *context, void **rv)
+static void acpi_processor_post_configure(struct acpi_device *device,
+					  enum acpihp_dev_post_cmd cmd)
 {
-	acpi_status status;
-	int *action = context;
-
-	status = is_processor_device(handle);
-	if (ACPI_FAILURE(status))
-		return AE_OK;	/* not a processor; continue to walk */
-
-	switch (*action) {
-	case INSTALL_NOTIFY_HANDLER:
-		acpi_install_notify_handler(handle,
-					    ACPI_SYSTEM_NOTIFY,
-					    acpi_processor_hotplug_notify,
-					    NULL);
-		break;
-	case UNINSTALL_NOTIFY_HANDLER:
-		acpi_remove_notify_handler(handle,
-					   ACPI_SYSTEM_NOTIFY,
-					   acpi_processor_hotplug_notify);
-		break;
-	default:
-		break;
-	}
+	struct acpi_processor *pr;
+
+	BUG_ON(!device || !acpi_driver_data(device));
+	pr = acpi_driver_data(device);
 
-	/* found a processor; skip walking underneath */
-	return AE_CTRL_DEPTH;
+	if (cmd == ACPIHP_DEV_POST_CMD_COMMIT) {
+		if (!cpu_online(pr->id) && cpu_up(pr->id))
+			dev_warn(&device->dev,
+				 "fails to online CPU%d.\n", pr->id);
+	} else if (cmd == ACPIHP_DEV_POST_CMD_ROLLBACK)
+		acpi_processor_reset(device, pr);
 }
 
-static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
+static int acpi_processor_release(struct acpi_device *device,
+				  struct acpihp_cancel_context *ctx)
 {
-	acpi_handle handle = pr->handle;
-
-	if (!is_processor_present(handle)) {
-		return AE_ERROR;
-	}
-
-	if (acpi_map_lsapic(handle, &pr->id))
-		return AE_ERROR;
+	int result = 0;
+	struct acpi_processor *pr;
 
-	if (arch_register_cpu(pr->id)) {
-		acpi_unmap_lsapic(pr->id);
-		return AE_ERROR;
-	}
+	if (!device || !acpi_driver_data(device))
+		return -EINVAL;
+	pr = acpi_driver_data(device);
 
-	/* CPU got hot-plugged, but cpu_data is not initialized yet
-	 * Set flag to delay cpu_idle/throttling initialization
-	 * in:
-	 * acpi_processor_add()
-	 *   acpi_processor_get_info()
-	 * and do it when the CPU gets online the first time
-	 * TBD: Cleanup above functions and try to do this more elegant.
-	 */
-	printk(KERN_INFO "CPU %d got hotplugged\n", pr->id);
-	pr->flags.need_hotplug_init = 1;
+	if (cpu_online(pr->id))
+		result = cpu_down(pr->id);
 
-	return AE_OK;
+	return result;
 }
 
-static int acpi_processor_handle_eject(struct acpi_processor *pr)
+static void acpi_processor_post_release(struct acpi_device *device,
+				        enum acpihp_dev_post_cmd cmd)
 {
-	if (cpu_online(pr->id))
-		cpu_down(pr->id);
+	struct acpi_processor *pr;
 
-	arch_unregister_cpu(pr->id);
-	acpi_unmap_lsapic(pr->id);
-	return (0);
-}
-#else
-static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
-{
-	return AE_ERROR;
-}
-static int acpi_processor_handle_eject(struct acpi_processor *pr)
-{
-	return (-EINVAL);
-}
-#endif
+	BUG_ON(!device || !acpi_driver_data(device));
+	pr = acpi_driver_data(device);
 
-static
-void acpi_processor_install_hotplug_notify(void)
-{
-#ifdef CONFIG_ACPI_HOTPLUG_CPU
-	int action = INSTALL_NOTIFY_HANDLER;
-	acpi_walk_namespace(ACPI_TYPE_ANY,
-			    ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX,
-			    processor_walk_namespace_cb, NULL, &action, NULL);
-#endif
-	register_hotcpu_notifier(&acpi_cpu_notifier);
+	if (cmd == ACPIHP_DEV_POST_CMD_ROLLBACK)
+		if (!cpu_online(pr->id))
+			cpu_up(pr->id);
 }
 
-static
-void acpi_processor_uninstall_hotplug_notify(void)
+static void acpi_processor_unconfigure(struct acpi_device *device)
 {
-#ifdef CONFIG_ACPI_HOTPLUG_CPU
-	int action = UNINSTALL_NOTIFY_HANDLER;
-	acpi_walk_namespace(ACPI_TYPE_ANY,
-			    ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX,
-			    processor_walk_namespace_cb, NULL, &action, NULL);
-#endif
-	unregister_hotcpu_notifier(&acpi_cpu_notifier);
+	struct acpi_processor *pr;
+
+	BUG_ON(!device || !acpi_driver_data(device));
+	pr = acpi_driver_data(device);
+	acpi_processor_stop(device, pr);
+	acpi_processor_reset(device, pr);
 }
 
+static struct acpihp_dev_ops acpi_processor_hp_ops = {
+	.get_info = &acpi_processor_get_dev_info,
+	.pre_configure = &acpi_processor_pre_configure,
+	.configure = &acpi_processor_configure,
+	.post_configure = &acpi_processor_post_configure,
+	.release = &acpi_processor_release,
+	.post_release = &acpi_processor_post_release,
+	.unconfigure = &acpi_processor_unconfigure,
+};
+#endif	/* CONFIG_ACPI_HOTPLUG_CPU */
+
 /*
  * We keep the driver loaded even when ACPI is not running.
  * This is needed for the powernow-k8 driver, that works even without
  * ACPI, but needs symbols from this driver
  */
-
 static int __init acpi_processor_init(void)
 {
 	int result = 0;
@@ -940,7 +827,7 @@ static int __init acpi_processor_init(void)
 	if (result < 0)
 		return result;
 
-	acpi_processor_install_hotplug_notify();
+	register_hotcpu_notifier(&acpi_cpu_notifier);
 
 	acpi_thermal_cpufreq_init();
 
@@ -960,7 +847,7 @@ static void __exit acpi_processor_exit(void)
 
 	acpi_thermal_cpufreq_exit();
 
-	acpi_processor_uninstall_hotplug_notify();
+	unregister_hotcpu_notifier(&acpi_cpu_notifier);
 
 	acpi_bus_unregister_driver(&acpi_processor_driver);