Merge branch 'linus' into timers/core

Conflicts:
	Documentation/feature-removal-schedule.txt

Merge reason: Resolve the conflict, update to upstream.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 978 insertions, 0 deletions

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
new file mode 100644
index 000000000000..b5658cdce27f
--- /dev/null
+++ b/drivers/acpi/processor_driver.c
@@ -0,0 +1,978 @@
+/*
+ * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
+ *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
+ *                      - Added processor hotplug support
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *  TBD:
+ *      1. Make # power states dynamic.
+ *      2. Support duty_cycle values that span bit 4.
+ *      3. Optimize by having scheduler determine business instead of
+ *         having us try to calculate it here.
+ *      4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/pm.h>
+#include <linux/cpufreq.h>
+#include <linux/cpu.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/dmi.h>
+#include <linux/moduleparam.h>
+#include <linux/cpuidle.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/cpu.h>
+#include <asm/delay.h>
+#include <asm/uaccess.h>
+#include <asm/processor.h>
+#include <asm/smp.h>
+#include <asm/acpi.h>
+
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/processor.h>
+
+#define PREFIX "ACPI: "
+
+#define ACPI_PROCESSOR_CLASS            "processor"
+#define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
+#define ACPI_PROCESSOR_FILE_INFO        "info"
+#define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
+#define ACPI_PROCESSOR_FILE_LIMIT       "limit"
+#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
+#define ACPI_PROCESSOR_NOTIFY_POWER     0x81
+#define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
+
+#define ACPI_PROCESSOR_LIMIT_USER       0
+#define ACPI_PROCESSOR_LIMIT_THERMAL    1
+
+#define _COMPONENT              ACPI_PROCESSOR_COMPONENT
+ACPI_MODULE_NAME("processor_driver");
+
+MODULE_AUTHOR("Paul Diefenbaugh");
+MODULE_DESCRIPTION("ACPI Processor Driver");
+MODULE_LICENSE("GPL");
+
+static int acpi_processor_add(struct acpi_device *device);
+static int acpi_processor_remove(struct acpi_device *device, int type);
+#ifdef CONFIG_ACPI_PROCFS
+static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
+#endif
+static void acpi_processor_notify(struct acpi_device *device, u32 event);
+static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
+static int acpi_processor_handle_eject(struct acpi_processor *pr);
+
+
+static const struct acpi_device_id processor_device_ids[] = {
+        {ACPI_PROCESSOR_OBJECT_HID, 0},
+        {"ACPI0007", 0},
+        {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, processor_device_ids);
+
+static struct acpi_driver acpi_processor_driver = {
+        .name = "processor",
+        .class = ACPI_PROCESSOR_CLASS,
+        .ids = processor_device_ids,
+        .ops = {
+                .add = acpi_processor_add,
+                .remove = acpi_processor_remove,
+                .suspend = acpi_processor_suspend,
+                .resume = acpi_processor_resume,
+                .notify = acpi_processor_notify,
+                },
+};
+
+#define INSTALL_NOTIFY_HANDLER          1
+#define UNINSTALL_NOTIFY_HANDLER        2
+#ifdef CONFIG_ACPI_PROCFS
+static const struct file_operations acpi_processor_info_fops = {
+        .owner = THIS_MODULE,
+        .open = acpi_processor_info_open_fs,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+#endif
+
+DEFINE_PER_CPU(struct acpi_processor *, processors);
+EXPORT_PER_CPU_SYMBOL(processors);
+
+struct acpi_processor_errata errata __read_mostly;
+
+/* --------------------------------------------------------------------------
+                                Errata Handling
+   -------------------------------------------------------------------------- */
+
+static int acpi_processor_errata_piix4(struct pci_dev *dev)
+{
+        u8 value1 = 0;
+        u8 value2 = 0;
+
+
+        if (!dev)
+                return -EINVAL;
+
+        /*
+         * Note that 'dev' references the PIIX4 ACPI Controller.
+         */
+
+        switch (dev->revision) {
+        case 0:
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
+                break;
+        case 1:
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
+                break;
+        case 2:
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
+                break;
+        case 3:
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
+                break;
+        default:
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
+                break;
+        }
+
+        switch (dev->revision) {
+
+        case 0:         /* PIIX4 A-step */
+        case 1:         /* PIIX4 B-step */
+                /*
+                 * See specification changes #13 ("Manual Throttle Duty Cycle")
+                 * and #14 ("Enabling and Disabling Manual Throttle"), plus
+                 * erratum #5 ("STPCLK# Deassertion Time") from the January
+                 * 2002 PIIX4 specification update.  Applies to only older
+                 * PIIX4 models.
+                 */
+                errata.piix4.throttle = 1;
+
+        case 2:         /* PIIX4E */
+        case 3:         /* PIIX4M */
+                /*
+                 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
+                 * Livelock") from the January 2002 PIIX4 specification update.
+                 * Applies to all PIIX4 models.
+                 */
+
+                /*
+                 * BM-IDE
+                 * ------
+                 * Find the PIIX4 IDE Controller and get the Bus Master IDE
+                 * Status register address.  We'll use this later to read
+                 * each IDE controller's DMA status to make sure we catch all
+                 * DMA activity.
+                 */
+                dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
+                                     PCI_DEVICE_ID_INTEL_82371AB,
+                                     PCI_ANY_ID, PCI_ANY_ID, NULL);
+                if (dev) {
+                        errata.piix4.bmisx = pci_resource_start(dev, 4);
+                        pci_dev_put(dev);
+                }
+
+                /*
+                 * Type-F DMA
+                 * ----------
+                 * Find the PIIX4 ISA Controller and read the Motherboard
+                 * DMA controller's status to see if Type-F (Fast) DMA mode
+                 * is enabled (bit 7) on either channel.  Note that we'll
+                 * disable C3 support if this is enabled, as some legacy
+                 * devices won't operate well if fast DMA is disabled.
+                 */
+                dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
+                                     PCI_DEVICE_ID_INTEL_82371AB_0,
+                                     PCI_ANY_ID, PCI_ANY_ID, NULL);
+                if (dev) {
+                        pci_read_config_byte(dev, 0x76, &value1);
+                        pci_read_config_byte(dev, 0x77, &value2);
+                        if ((value1 & 0x80) || (value2 & 0x80))
+                                errata.piix4.fdma = 1;
+                        pci_dev_put(dev);
+                }
+
+                break;
+        }
+
+        if (errata.piix4.bmisx)
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                  "Bus master activity detection (BM-IDE) erratum enabled\n"));
+        if (errata.piix4.fdma)
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                  "Type-F DMA livelock erratum (C3 disabled)\n"));
+
+        return 0;
+}
+
+static int acpi_processor_errata(struct acpi_processor *pr)
+{
+        int result = 0;
+        struct pci_dev *dev = NULL;
+
+
+        if (!pr)
+                return -EINVAL;
+
+        /*
+         * PIIX4
+         */
+        dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
+                             PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
+                             PCI_ANY_ID, NULL);
+        if (dev) {
+                result = acpi_processor_errata_piix4(dev);
+                pci_dev_put(dev);
+        }
+
+        return result;
+}
+
+/* --------------------------------------------------------------------------
+                              FS Interface (/proc)
+   -------------------------------------------------------------------------- */
+
+#ifdef CONFIG_ACPI_PROCFS
+static struct proc_dir_entry *acpi_processor_dir = NULL;
+
+static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
+{
+        struct acpi_processor *pr = seq->private;
+
+
+        if (!pr)
+                goto end;
+
+        seq_printf(seq, "processor id:            %d\n"
+                   "acpi id:                 %d\n"
+                   "bus mastering control:   %s\n"
+                   "power management:        %s\n"
+                   "throttling control:      %s\n"
+                   "limit interface:         %s\n",
+                   pr->id,
+                   pr->acpi_id,
+                   pr->flags.bm_control ? "yes" : "no",
+                   pr->flags.power ? "yes" : "no",
+                   pr->flags.throttling ? "yes" : "no",
+                   pr->flags.limit ? "yes" : "no");
+
+      end:
+        return 0;
+}
+
+static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
+{
+        return single_open(file, acpi_processor_info_seq_show,
+                           PDE(inode)->data);
+}
+
+static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
+{
+        struct proc_dir_entry *entry = NULL;
+
+
+        if (!acpi_device_dir(device)) {
+                acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
+                                                     acpi_processor_dir);
+                if (!acpi_device_dir(device))
+                        return -ENODEV;
+        }
+
+        /* 'info' [R] */
+        entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
+                                 S_IRUGO, acpi_device_dir(device),
+                                 &acpi_processor_info_fops,
+                                 acpi_driver_data(device));
+        if (!entry)
+                return -EIO;
+
+        /* 'throttling' [R/W] */
+        entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
+                                 S_IFREG | S_IRUGO | S_IWUSR,
+                                 acpi_device_dir(device),
+                                 &acpi_processor_throttling_fops,
+                                 acpi_driver_data(device));
+        if (!entry)
+                return -EIO;
+
+        /* 'limit' [R/W] */
+        entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
+                                 S_IFREG | S_IRUGO | S_IWUSR,
+                                 acpi_device_dir(device),
+                                 &acpi_processor_limit_fops,
+                                 acpi_driver_data(device));
+        if (!entry)
+                return -EIO;
+        return 0;
+}
+static int acpi_processor_remove_fs(struct acpi_device *device)
+{
+
+        if (acpi_device_dir(device)) {
+                remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
+                                  acpi_device_dir(device));
+                remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
+                                  acpi_device_dir(device));
+                remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
+                                  acpi_device_dir(device));
+                remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
+                acpi_device_dir(device) = NULL;
+        }
+
+        return 0;
+}
+#else
+static inline int acpi_processor_add_fs(struct acpi_device *device)
+{
+        return 0;
+}
+static inline int acpi_processor_remove_fs(struct acpi_device *device)
+{
+        return 0;
+}
+#endif
+
+/* --------------------------------------------------------------------------
+                                 Driver Interface
+   -------------------------------------------------------------------------- */
+
+static int acpi_processor_get_info(struct acpi_device *device)
+{
+        acpi_status status = 0;
+        union acpi_object object = { 0 };
+        struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
+        struct acpi_processor *pr;
+        int cpu_index, device_declaration = 0;
+        static int cpu0_initialized;
+
+        pr = acpi_driver_data(device);
+        if (!pr)
+                return -EINVAL;
+
+        if (num_online_cpus() > 1)
+                errata.smp = TRUE;
+
+        acpi_processor_errata(pr);
+
+        /*
+         * Check to see if we have bus mastering arbitration control.  This
+         * is required for proper C3 usage (to maintain cache coherency).
+         */
+        if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
+                pr->flags.bm_control = 1;
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                  "Bus mastering arbitration control present\n"));
+        } else
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                  "No bus mastering arbitration control\n"));
+
+        if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
+                /* Declared with "Processor" statement; match ProcessorID */
+                status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
+                if (ACPI_FAILURE(status)) {
+                        printk(KERN_ERR PREFIX "Evaluating processor object\n");
+                        return -ENODEV;
+                }
+
+                /*
+                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
+                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
+                 *      arch/xxx/acpi.c
+                 */
+                pr->acpi_id = object.processor.proc_id;
+        } else {
+                /*
+                 * Declared with "Device" statement; match _UID.
+                 * Note that we don't handle string _UIDs yet.
+                 */
+                unsigned long long value;
+                status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
+                                                NULL, &value);
+                if (ACPI_FAILURE(status)) {
+                        printk(KERN_ERR PREFIX
+                            "Evaluating processor _UID [%#x]\n", status);
+                        return -ENODEV;
+                }
+                device_declaration = 1;
+                pr->acpi_id = value;
+        }
+        cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
+
+        /* Handle UP system running SMP kernel, with no LAPIC in MADT */
+        if (!cpu0_initialized && (cpu_index == -1) &&
+            (num_online_cpus() == 1)) {
+                cpu_index = 0;
+        }
+
+        cpu0_initialized = 1;
+
+        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->handle, &pr->id))) {
+                        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
+         * \_SB.SCK1.CPU0
+         * Rename the processor device bus id. And the new bus id will be
+         * generated as the following format:
+         * CPU+CPU ID.
+         */
+        sprintf(acpi_device_bid(device), "CPU%X", pr->id);
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
+                          pr->acpi_id));
+
+        if (!object.processor.pblk_address)
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
+        else if (object.processor.pblk_length != 6)
+                printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
+                            object.processor.pblk_length);
+        else {
+                pr->throttling.address = object.processor.pblk_address;
+                pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
+                pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
+
+                pr->pblk = object.processor.pblk_address;
+
+                /*
+                 * We don't care about error returns - we just try to mark
+                 * these reserved so that nobody else is confused into thinking
+                 * that this region might be unused..
+                 *
+                 * (In particular, allocating the IO range for Cardbus)
+                 */
+                request_region(pr->throttling.address, 6, "ACPI CPU throttle");
+        }
+
+        /*
+         * If ACPI describes a slot number for this CPU, we can use it
+         * ensure we get the right value in the "physical id" field
+         * of /proc/cpuinfo
+         */
+        status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
+        if (ACPI_SUCCESS(status))
+                arch_fix_phys_package_id(pr->id, object.integer.value);
+
+        return 0;
+}
+
+static DEFINE_PER_CPU(void *, processor_device_array);
+
+static void acpi_processor_notify(struct acpi_device *device, u32 event)
+{
+        struct acpi_processor *pr = acpi_driver_data(device);
+        int saved;
+
+        if (!pr)
+                return;
+
+        switch (event) {
+        case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
+                saved = pr->performance_platform_limit;
+                acpi_processor_ppc_has_changed(pr, 1);
+                if (saved == pr->performance_platform_limit)
+                        break;
+                acpi_bus_generate_proc_event(device, event,
+                                        pr->performance_platform_limit);
+                acpi_bus_generate_netlink_event(device->pnp.device_class,
+                                                  dev_name(&device->dev), event,
+                                                  pr->performance_platform_limit);
+                break;
+        case ACPI_PROCESSOR_NOTIFY_POWER:
+                acpi_processor_cst_has_changed(pr);
+                acpi_bus_generate_proc_event(device, event, 0);
+                acpi_bus_generate_netlink_event(device->pnp.device_class,
+                                                  dev_name(&device->dev), event, 0);
+                break;
+        case ACPI_PROCESSOR_NOTIFY_THROTTLING:
+                acpi_processor_tstate_has_changed(pr);
+                acpi_bus_generate_proc_event(device, event, 0);
+                acpi_bus_generate_netlink_event(device->pnp.device_class,
+                                                  dev_name(&device->dev), event, 0);
+        default:
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                  "Unsupported event [0x%x]\n", event));
+                break;
+        }
+
+        return;
+}
+
+static int acpi_cpu_soft_notify(struct notifier_block *nfb,
+                unsigned long action, void *hcpu)
+{
+        unsigned int cpu = (unsigned long)hcpu;
+        struct acpi_processor *pr = per_cpu(processors, cpu);
+
+        if (action == CPU_ONLINE && pr) {
+                acpi_processor_ppc_has_changed(pr, 0);
+                acpi_processor_cst_has_changed(pr);
+                acpi_processor_tstate_has_changed(pr);
+        }
+        return NOTIFY_OK;
+}
+
+static struct notifier_block acpi_cpu_notifier =
+{
+            .notifier_call = acpi_cpu_soft_notify,
+};
+
+static int __cpuinit acpi_processor_add(struct acpi_device *device)
+{
+        struct acpi_processor *pr = NULL;
+        int result = 0;
+        struct sys_device *sysdev;
+
+        pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
+        if (!pr)
+                return -ENOMEM;
+
+        if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
+                kfree(pr);
+                return -ENOMEM;
+        }
+
+        pr->handle = device->handle;
+        strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
+        strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
+        device->driver_data = pr;
+
+        result = acpi_processor_get_info(device);
+        if (result) {
+                /* Processor is physically not present */
+                return 0;
+        }
+
+        BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
+
+        /*
+         * Buggy BIOS check
+         * ACPI id of processors can be reported wrongly by the BIOS.
+         * Don't trust it blindly
+         */
+        if (per_cpu(processor_device_array, pr->id) != NULL &&
+            per_cpu(processor_device_array, pr->id) != device) {
+                printk(KERN_WARNING "BIOS reported wrong ACPI id "
+                        "for the processor\n");
+                result = -ENODEV;
+                goto err_free_cpumask;
+        }
+        per_cpu(processor_device_array, pr->id) = device;
+
+        per_cpu(processors, pr->id) = pr;
+
+        result = acpi_processor_add_fs(device);
+        if (result)
+                goto err_free_cpumask;
+
+        sysdev = get_cpu_sysdev(pr->id);
+        if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
+                result = -EFAULT;
+                goto err_remove_fs;
+        }
+
+#ifdef CONFIG_CPU_FREQ
+        acpi_processor_ppc_has_changed(pr, 0);
+#endif
+        acpi_processor_get_throttling_info(pr);
+        acpi_processor_get_limit_info(pr);
+
+
+        acpi_processor_power_init(pr, device);
+
+        pr->cdev = thermal_cooling_device_register("Processor", device,
+                                                &processor_cooling_ops);
+        if (IS_ERR(pr->cdev)) {
+                result = PTR_ERR(pr->cdev);
+                goto err_power_exit;
+        }
+
+        dev_dbg(&device->dev, "registered as cooling_device%d\n",
+                 pr->cdev->id);
+
+        result = sysfs_create_link(&device->dev.kobj,
+                                   &pr->cdev->device.kobj,
+                                   "thermal_cooling");
+        if (result) {
+                printk(KERN_ERR PREFIX "Create sysfs link\n");
+                goto err_thermal_unregister;
+        }
+        result = sysfs_create_link(&pr->cdev->device.kobj,
+                                   &device->dev.kobj,
+                                   "device");
+        if (result) {
+                printk(KERN_ERR PREFIX "Create sysfs link\n");
+                goto err_remove_sysfs;
+        }
+
+        return 0;
+
+err_remove_sysfs:
+        sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
+err_thermal_unregister:
+        thermal_cooling_device_unregister(pr->cdev);
+err_power_exit:
+        acpi_processor_power_exit(pr, device);
+err_remove_fs:
+        acpi_processor_remove_fs(device);
+err_free_cpumask:
+        free_cpumask_var(pr->throttling.shared_cpu_map);
+
+        return result;
+}
+
+static int acpi_processor_remove(struct acpi_device *device, int type)
+{
+        struct acpi_processor *pr = NULL;
+
+
+        if (!device || !acpi_driver_data(device))
+                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;
+        }
+
+        acpi_processor_power_exit(pr, device);
+
+        sysfs_remove_link(&device->dev.kobj, "sysdev");
+
+        acpi_processor_remove_fs(device);
+
+        if (pr->cdev) {
+                sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
+                sysfs_remove_link(&pr->cdev->device.kobj, "device");
+                thermal_cooling_device_unregister(pr->cdev);
+                pr->cdev = NULL;
+        }
+
+        per_cpu(processors, pr->id) = NULL;
+        per_cpu(processor_device_array, pr->id) = NULL;
+
+free:
+        free_cpumask_var(pr->throttling.shared_cpu_map);
+        kfree(pr);
+
+        return 0;
+}
+
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+/****************************************************************************
+ *      Acpi processor hotplug support                                      *
+ ****************************************************************************/
+
+static int is_processor_present(acpi_handle handle)
+{
+        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;
+}
+
+static
+int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
+{
+        acpi_handle phandle;
+        struct acpi_device *pdev;
+
+
+        if (acpi_get_parent(handle, &phandle)) {
+                return -ENODEV;
+        }
+
+        if (acpi_bus_get_device(phandle, &pdev)) {
+                return -ENODEV;
+        }
+
+        if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
+                                                u32 event, void *data)
+{
+        struct acpi_processor *pr;
+        struct acpi_device *device = NULL;
+        int result;
+
+
+        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)) {
+                        result = acpi_processor_device_add(handle, &device);
+                        if (result)
+                                printk(KERN_ERR PREFIX
+                                            "Unable to add the device\n");
+                        break;
+                }
+                break;
+        case ACPI_NOTIFY_EJECT_REQUEST:
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                  "received ACPI_NOTIFY_EJECT_REQUEST\n"));
+
+                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");
+                        return;
+                }
+                break;
+        default:
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                  "Unsupported event [0x%x]\n", event));
+                break;
+        }
+
+        return;
+}
+
+static acpi_status
+processor_walk_namespace_cb(acpi_handle handle,
+                            u32 lvl, void *context, void **rv)
+{
+        acpi_status status;
+        int *action = context;
+        acpi_object_type type = 0;
+
+        status = acpi_get_type(handle, &type);
+        if (ACPI_FAILURE(status))
+                return (AE_OK);
+
+        if (type != ACPI_TYPE_PROCESSOR)
+                return (AE_OK);
+
+        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;
+        }
+
+        return (AE_OK);
+}
+
+static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
+{
+
+        if (!is_processor_present(handle)) {
+                return AE_ERROR;
+        }
+
+        if (acpi_map_lsapic(handle, p_cpu))
+                return AE_ERROR;
+
+        if (arch_register_cpu(*p_cpu)) {
+                acpi_unmap_lsapic(*p_cpu);
+                return AE_ERROR;
+        }
+
+        return AE_OK;
+}
+
+static int acpi_processor_handle_eject(struct acpi_processor *pr)
+{
+        if (cpu_online(pr->id))
+                cpu_down(pr->id);
+
+        arch_unregister_cpu(pr->id);
+        acpi_unmap_lsapic(pr->id);
+        return (0);
+}
+#else
+static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
+{
+        return AE_ERROR;
+}
+static int acpi_processor_handle_eject(struct acpi_processor *pr)
+{
+        return (-EINVAL);
+}
+#endif
+
+static
+void acpi_processor_install_hotplug_notify(void)
+{
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+        int action = INSTALL_NOTIFY_HANDLER;
+        acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
+                            ACPI_ROOT_OBJECT,
+                            ACPI_UINT32_MAX,
+                            processor_walk_namespace_cb, NULL, &action, NULL);
+#endif
+        register_hotcpu_notifier(&acpi_cpu_notifier);
+}
+
+static
+void acpi_processor_uninstall_hotplug_notify(void)
+{
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+        int action = UNINSTALL_NOTIFY_HANDLER;
+        acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
+                            ACPI_ROOT_OBJECT,
+                            ACPI_UINT32_MAX,
+                            processor_walk_namespace_cb, NULL, &action, NULL);
+#endif
+        unregister_hotcpu_notifier(&acpi_cpu_notifier);
+}
+
+/*
+ * 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;
+
+        if (acpi_disabled)
+                return 0;
+
+        memset(&errata, 0, sizeof(errata));
+
+#ifdef CONFIG_ACPI_PROCFS
+        acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+        if (!acpi_processor_dir)
+                return -ENOMEM;
+#endif
+        result = cpuidle_register_driver(&acpi_idle_driver);
+        if (result < 0)
+                goto out_proc;
+
+        result = acpi_bus_register_driver(&acpi_processor_driver);
+        if (result < 0)
+                goto out_cpuidle;
+
+        acpi_processor_install_hotplug_notify();
+
+        acpi_thermal_cpufreq_init();
+
+        acpi_processor_ppc_init();
+
+        acpi_processor_throttling_init();
+
+        return 0;
+
+out_cpuidle:
+        cpuidle_unregister_driver(&acpi_idle_driver);
+
+out_proc:
+#ifdef CONFIG_ACPI_PROCFS
+        remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+#endif
+
+        return result;
+}
+
+static void __exit acpi_processor_exit(void)
+{
+        if (acpi_disabled)
+                return;
+
+        acpi_processor_ppc_exit();
+
+        acpi_thermal_cpufreq_exit();
+
+        acpi_processor_uninstall_hotplug_notify();
+
+        acpi_bus_unregister_driver(&acpi_processor_driver);
+
+        cpuidle_unregister_driver(&acpi_idle_driver);
+
+#ifdef CONFIG_ACPI_PROCFS
+        remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+#endif
+
+        return;
+}
+
+module_init(acpi_processor_init);
+module_exit(acpi_processor_exit);
+
+EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
+
+MODULE_ALIAS("processor");