Merge branch 'syscore' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6

* 'syscore' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6:
  Introduce ARCH_NO_SYSDEV_OPS config option (v2)
  cpufreq: Use syscore_ops for boot CPU suspend/resume (v2)
  KVM: Use syscore_ops instead of sysdev class and sysdev
  PCI / Intel IOMMU: Use syscore_ops instead of sysdev class and sysdev
  timekeeping: Use syscore_ops instead of sysdev class and sysdev
  x86: Use syscore_ops instead of sysdev classes and sysdevs

20 files changed, 206 insertions, 351 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 140e254fe546..cc6c53a95bfd 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -71,6 +71,7 @@ config X86
         select GENERIC_IRQ_SHOW
         select IRQ_FORCED_THREADING
         select USE_GENERIC_SMP_HELPERS if SMP
+        select ARCH_NO_SYSDEV_OPS
 
 config INSTRUCTION_DECODER
         def_bool (KPROBES || PERF_EVENTS)
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 6e11c8134158..246d727b65b7 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -21,7 +21,7 @@
 #include <linux/acpi.h>
 #include <linux/list.h>
 #include <linux/slab.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/interrupt.h>
 #include <linux/msi.h>
 #include <asm/pci-direct.h>
@@ -1260,7 +1260,7 @@ static void disable_iommus(void)
  * disable suspend until real resume implemented
  */
 
-static int amd_iommu_resume(struct sys_device *dev)
+static void amd_iommu_resume(void)
 {
         struct amd_iommu *iommu;
 
@@ -1276,11 +1276,9 @@ static int amd_iommu_resume(struct sys_device *dev)
          */
         amd_iommu_flush_all_devices();
         amd_iommu_flush_all_domains();
-
-        return 0;
 }
 
-static int amd_iommu_suspend(struct sys_device *dev, pm_message_t state)
+static int amd_iommu_suspend(void)
 {
         /* disable IOMMUs to go out of the way for BIOS */
         disable_iommus();
@@ -1288,17 +1286,11 @@ static int amd_iommu_suspend(struct sys_device *dev, pm_message_t state)
         return 0;
 }
 
-static struct sysdev_class amd_iommu_sysdev_class = {
-        .name = "amd_iommu",
+static struct syscore_ops amd_iommu_syscore_ops = {
         .suspend = amd_iommu_suspend,
         .resume = amd_iommu_resume,
 };
 
-static struct sys_device device_amd_iommu = {
-        .id = 0,
-        .cls = &amd_iommu_sysdev_class,
-};
-
 /*
  * This is the core init function for AMD IOMMU hardware in the system.
  * This function is called from the generic x86 DMA layer initialization
@@ -1415,14 +1407,6 @@ static int __init amd_iommu_init(void)
                 goto free;
         }
 
-        ret = sysdev_class_register(&amd_iommu_sysdev_class);
-        if (ret)
-                goto free;
-
-        ret = sysdev_register(&device_amd_iommu);
-        if (ret)
-                goto free;
-
         ret = amd_iommu_init_devices();
         if (ret)
                 goto free;
@@ -1441,6 +1425,8 @@ static int __init amd_iommu_init(void)
 
         amd_iommu_init_notifier();
 
+        register_syscore_ops(&amd_iommu_syscore_ops);
+
         if (iommu_pass_through)
                 goto out;
 
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 966673f44141..fabf01eff771 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -24,7 +24,7 @@
 #include <linux/ftrace.h>
 #include <linux/ioport.h>
 #include <linux/module.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/delay.h>
 #include <linux/timex.h>
 #include <linux/dmar.h>
@@ -2046,7 +2046,7 @@ static struct {
         unsigned int apic_thmr;
 } apic_pm_state;
 
-static int lapic_suspend(struct sys_device *dev, pm_message_t state)
+static int lapic_suspend(void)
 {
         unsigned long flags;
         int maxlvt;
@@ -2084,23 +2084,21 @@ static int lapic_suspend(struct sys_device *dev, pm_message_t state)
         return 0;
 }
 
-static int lapic_resume(struct sys_device *dev)
+static void lapic_resume(void)
 {
         unsigned int l, h;
         unsigned long flags;
-        int maxlvt;
-        int ret = 0;
+        int maxlvt, ret;
         struct IO_APIC_route_entry **ioapic_entries = NULL;
 
         if (!apic_pm_state.active)
-                return 0;
+                return;
 
         local_irq_save(flags);
         if (intr_remapping_enabled) {
                 ioapic_entries = alloc_ioapic_entries();
                 if (!ioapic_entries) {
                         WARN(1, "Alloc ioapic_entries in lapic resume failed.");
-                        ret = -ENOMEM;
                         goto restore;
                 }
 
@@ -2162,8 +2160,6 @@ static int lapic_resume(struct sys_device *dev)
         }
 restore:
         local_irq_restore(flags);
-
-        return ret;
 }
 
 /*
@@ -2171,17 +2167,11 @@ restore:
  * are needed on every CPU up until machine_halt/restart/poweroff.
  */
 
-static struct sysdev_class lapic_sysclass = {
-        .name           = "lapic",
+static struct syscore_ops lapic_syscore_ops = {
         .resume         = lapic_resume,
         .suspend        = lapic_suspend,
 };
 
-static struct sys_device device_lapic = {
-        .id     = 0,
-        .cls    = &lapic_sysclass,
-};
-
 static void __cpuinit apic_pm_activate(void)
 {
         apic_pm_state.active = 1;
@@ -2189,16 +2179,11 @@ static void __cpuinit apic_pm_activate(void)
 
 static int __init init_lapic_sysfs(void)
 {
-        int error;
-
-        if (!cpu_has_apic)
-                return 0;
         /* XXX: remove suspend/resume procs if !apic_pm_state.active? */
+        if (cpu_has_apic)
+                register_syscore_ops(&lapic_syscore_ops);
 
-        error = sysdev_class_register(&lapic_sysclass);
-        if (!error)
-                error = sysdev_register(&device_lapic);
-        return error;
+        return 0;
 }
 
 /* local apic needs to resume before other devices access its registers. */
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 180ca240e03c..68df09bba92e 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -30,7 +30,7 @@
 #include <linux/compiler.h>
 #include <linux/acpi.h>
 #include <linux/module.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/msi.h>
 #include <linux/htirq.h>
 #include <linux/freezer.h>
@@ -2918,89 +2918,84 @@ static int __init io_apic_bug_finalize(void)
 
 late_initcall(io_apic_bug_finalize);
 
-struct sysfs_ioapic_data {
-        struct sys_device dev;
-        struct IO_APIC_route_entry entry[0];
-};
-static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
+static struct IO_APIC_route_entry *ioapic_saved_data[MAX_IO_APICS];
 
-static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
+static void suspend_ioapic(int ioapic_id)
 {
-        struct IO_APIC_route_entry *entry;
-        struct sysfs_ioapic_data *data;
+        struct IO_APIC_route_entry *saved_data = ioapic_saved_data[ioapic_id];
         int i;
 
-        data = container_of(dev, struct sysfs_ioapic_data, dev);
-        entry = data->entry;
-        for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
-                *entry = ioapic_read_entry(dev->id, i);
+        if (!saved_data)
+                return;
+
+        for (i = 0; i < nr_ioapic_registers[ioapic_id]; i++)
+                saved_data[i] = ioapic_read_entry(ioapic_id, i);
+}
+
+static int ioapic_suspend(void)
+{
+        int ioapic_id;
+
+        for (ioapic_id = 0; ioapic_id < nr_ioapics; ioapic_id++)
+                suspend_ioapic(ioapic_id);
 
         return 0;
 }
 
-static int ioapic_resume(struct sys_device *dev)
+static void resume_ioapic(int ioapic_id)
 {
-        struct IO_APIC_route_entry *entry;
-        struct sysfs_ioapic_data *data;
+        struct IO_APIC_route_entry *saved_data = ioapic_saved_data[ioapic_id];
         unsigned long flags;
         union IO_APIC_reg_00 reg_00;
         int i;
 
-        data = container_of(dev, struct sysfs_ioapic_data, dev);
-        entry = data->entry;
+        if (!saved_data)
+                return;
 
         raw_spin_lock_irqsave(&ioapic_lock, flags);
-        reg_00.raw = io_apic_read(dev->id, 0);
-        if (reg_00.bits.ID != mp_ioapics[dev->id].apicid) {
-                reg_00.bits.ID = mp_ioapics[dev->id].apicid;
-                io_apic_write(dev->id, 0, reg_00.raw);
+        reg_00.raw = io_apic_read(ioapic_id, 0);
+        if (reg_00.bits.ID != mp_ioapics[ioapic_id].apicid) {
+                reg_00.bits.ID = mp_ioapics[ioapic_id].apicid;
+                io_apic_write(ioapic_id, 0, reg_00.raw);
         }
         raw_spin_unlock_irqrestore(&ioapic_lock, flags);
-        for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
-                ioapic_write_entry(dev->id, i, entry[i]);
+        for (i = 0; i < nr_ioapic_registers[ioapic_id]; i++)
+                ioapic_write_entry(ioapic_id, i, saved_data[i]);
+}
 
-        return 0;
+static void ioapic_resume(void)
+{
+        int ioapic_id;
+
+        for (ioapic_id = nr_ioapics - 1; ioapic_id >= 0; ioapic_id--)
+                resume_ioapic(ioapic_id);
 }
 
-static struct sysdev_class ioapic_sysdev_class = {
-        .name = "ioapic",
+static struct syscore_ops ioapic_syscore_ops = {
         .suspend = ioapic_suspend,
         .resume = ioapic_resume,
 };
 
-static int __init ioapic_init_sysfs(void)
+static int __init ioapic_init_ops(void)
 {
-        struct sys_device * dev;
-        int i, size, error;
+        int i;
 
-        error = sysdev_class_register(&ioapic_sysdev_class);
-        if (error)
-                return error;
+        for (i = 0; i < nr_ioapics; i++) {
+                unsigned int size;
 
-        for (i = 0; i < nr_ioapics; i++ ) {
-                size = sizeof(struct sys_device) + nr_ioapic_registers[i]
+                size = nr_ioapic_registers[i]
                         * sizeof(struct IO_APIC_route_entry);
-                mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL);
-                if (!mp_ioapic_data[i]) {
-                        printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
-                        continue;
-                }
-                dev = &mp_ioapic_data[i]->dev;
-                dev->id = i;
-                dev->cls = &ioapic_sysdev_class;
-                error = sysdev_register(dev);
-                if (error) {
-                        kfree(mp_ioapic_data[i]);
-                        mp_ioapic_data[i] = NULL;
-                        printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
-                        continue;
-                }
+                ioapic_saved_data[i] = kzalloc(size, GFP_KERNEL);
+                if (!ioapic_saved_data[i])
+                        pr_err("IOAPIC %d: suspend/resume impossible!\n", i);
         }
 
+        register_syscore_ops(&ioapic_syscore_ops);
+
         return 0;
 }
 
-device_initcall(ioapic_init_sysfs);
+device_initcall(ioapic_init_ops);
 
 /*
  * Dynamic irq allocate and deallocation
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index ab1122998dba..5a05ef63eb4a 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -21,6 +21,7 @@
 #include <linux/percpu.h>
 #include <linux/string.h>
 #include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/delay.h>
 #include <linux/ctype.h>
 #include <linux/sched.h>
@@ -1749,14 +1750,14 @@ static int mce_disable_error_reporting(void)
         return 0;
 }
 
-static int mce_suspend(struct sys_device *dev, pm_message_t state)
+static int mce_suspend(void)
 {
         return mce_disable_error_reporting();
 }
 
-static int mce_shutdown(struct sys_device *dev)
+static void mce_shutdown(void)
 {
-        return mce_disable_error_reporting();
+        mce_disable_error_reporting();
 }
 
 /*
@@ -1764,14 +1765,18 @@ static int mce_shutdown(struct sys_device *dev)
  * Only one CPU is active at this time, the others get re-added later using
  * CPU hotplug:
  */
-static int mce_resume(struct sys_device *dev)
+static void mce_resume(void)
 {
         __mcheck_cpu_init_generic();
         __mcheck_cpu_init_vendor(__this_cpu_ptr(&cpu_info));
-
-        return 0;
 }
 
+static struct syscore_ops mce_syscore_ops = {
+        .suspend        = mce_suspend,
+        .shutdown       = mce_shutdown,
+        .resume         = mce_resume,
+};
+
 static void mce_cpu_restart(void *data)
 {
         del_timer_sync(&__get_cpu_var(mce_timer));
@@ -1808,9 +1813,6 @@ static void mce_enable_ce(void *all)
 }
 
 static struct sysdev_class mce_sysclass = {
-        .suspend        = mce_suspend,
-        .shutdown       = mce_shutdown,
-        .resume         = mce_resume,
         .name           = "machinecheck",
 };
 
@@ -2139,6 +2141,7 @@ static __init int mcheck_init_device(void)
                         return err;
         }
 
+        register_syscore_ops(&mce_syscore_ops);
         register_hotcpu_notifier(&mce_cpu_notifier);
         misc_register(&mce_log_device);
 
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index bebabec5b448..307dfbbf4a8e 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -45,6 +45,7 @@
 #include <linux/cpu.h>
 #include <linux/pci.h>
 #include <linux/smp.h>
+#include <linux/syscore_ops.h>
 
 #include <asm/processor.h>
 #include <asm/e820.h>
@@ -630,7 +631,7 @@ struct mtrr_value {
 
 static struct mtrr_value mtrr_value[MTRR_MAX_VAR_RANGES];
 
-static int mtrr_save(struct sys_device *sysdev, pm_message_t state)
+static int mtrr_save(void)
 {
         int i;
 
@@ -642,7 +643,7 @@ static int mtrr_save(struct sys_device *sysdev, pm_message_t state)
         return 0;
 }
 
-static int mtrr_restore(struct sys_device *sysdev)
+static void mtrr_restore(void)
 {
         int i;
 
@@ -653,12 +654,11 @@ static int mtrr_restore(struct sys_device *sysdev)
                                     mtrr_value[i].ltype);
                 }
         }
-        return 0;
 }
 
 
 
-static struct sysdev_driver mtrr_sysdev_driver = {
+static struct syscore_ops mtrr_syscore_ops = {
         .suspend        = mtrr_save,
         .resume         = mtrr_restore,
 };
@@ -839,7 +839,7 @@ static int __init mtrr_init_finialize(void)
          * TBD: is there any system with such CPU which supports
          * suspend/resume? If no, we should remove the code.
          */
-        sysdev_driver_register(&cpu_sysdev_class, &mtrr_sysdev_driver);
+        register_syscore_ops(&mtrr_syscore_ops);
 
         return 0;
 }
diff --git a/arch/x86/kernel/i8237.c b/arch/x86/kernel/i8237.c
index b42ca694dc68..8eeaa81de066 100644
--- a/arch/x86/kernel/i8237.c
+++ b/arch/x86/kernel/i8237.c
@@ -10,7 +10,7 @@
  */
 
 #include <linux/init.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 
 #include <asm/dma.h>
 
@@ -21,7 +21,7 @@
  * in asm/dma.h.
  */
 
-static int i8237A_resume(struct sys_device *dev)
+static void i8237A_resume(void)
 {
         unsigned long flags;
         int i;
@@ -41,31 +41,15 @@ static int i8237A_resume(struct sys_device *dev)
         enable_dma(4);
 
         release_dma_lock(flags);
-
-        return 0;
 }
 
-static int i8237A_suspend(struct sys_device *dev, pm_message_t state)
-{
-        return 0;
-}
-
-static struct sysdev_class i8237_sysdev_class = {
-        .name           = "i8237",
-        .suspend        = i8237A_suspend,
+static struct syscore_ops i8237_syscore_ops = {
         .resume         = i8237A_resume,
 };
 
-static struct sys_device device_i8237A = {
-        .id             = 0,
-        .cls            = &i8237_sysdev_class,
-};
-
-static int __init i8237A_init_sysfs(void)
+static int __init i8237A_init_ops(void)
 {
-        int error = sysdev_class_register(&i8237_sysdev_class);
-        if (!error)
-                error = sysdev_register(&device_i8237A);
-        return error;
+        register_syscore_ops(&i8237_syscore_ops);
+        return 0;
 }
-device_initcall(i8237A_init_sysfs);
+device_initcall(i8237A_init_ops);
diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c
index d9ca749c123b..65b8f5c2eebf 100644
--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -8,7 +8,7 @@
 #include <linux/random.h>
 #include <linux/init.h>
 #include <linux/kernel_stat.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/bitops.h>
 #include <linux/acpi.h>
 #include <linux/io.h>
@@ -245,20 +245,19 @@ static void save_ELCR(char *trigger)
         trigger[1] = inb(0x4d1) & 0xDE;
 }
 
-static int i8259A_resume(struct sys_device *dev)
+static void i8259A_resume(void)
 {
         init_8259A(i8259A_auto_eoi);
         restore_ELCR(irq_trigger);
-        return 0;
 }
 
-static int i8259A_suspend(struct sys_device *dev, pm_message_t state)
+static int i8259A_suspend(void)
 {
         save_ELCR(irq_trigger);
         return 0;
 }
 
-static int i8259A_shutdown(struct sys_device *dev)
+static void i8259A_shutdown(void)
 {
         /* Put the i8259A into a quiescent state that
          * the kernel initialization code can get it
@@ -266,21 +265,14 @@ static int i8259A_shutdown(struct sys_device *dev)
          */
         outb(0xff, PIC_MASTER_IMR);     /* mask all of 8259A-1 */
         outb(0xff, PIC_SLAVE_IMR);      /* mask all of 8259A-1 */
-        return 0;
 }
 
-static struct sysdev_class i8259_sysdev_class = {
-        .name = "i8259",
+static struct syscore_ops i8259_syscore_ops = {
         .suspend = i8259A_suspend,
         .resume = i8259A_resume,
         .shutdown = i8259A_shutdown,
 };
 
-static struct sys_device device_i8259A = {
-        .id     = 0,
-        .cls    = &i8259_sysdev_class,
-};
-
 static void mask_8259A(void)
 {
         unsigned long flags;
@@ -399,17 +391,12 @@ struct legacy_pic default_legacy_pic = {
 
 struct legacy_pic *legacy_pic = &default_legacy_pic;
 
-static int __init i8259A_init_sysfs(void)
+static int __init i8259A_init_ops(void)
 {
-        int error;
-
-        if (legacy_pic != &default_legacy_pic)
-                return 0;
+        if (legacy_pic == &default_legacy_pic)
+                register_syscore_ops(&i8259_syscore_ops);
 
-        error = sysdev_class_register(&i8259_sysdev_class);
-        if (!error)
-                error = sysdev_register(&device_i8259A);
-        return error;
+        return 0;
 }
 
-device_initcall(i8259A_init_sysfs);
+device_initcall(i8259A_init_ops);
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index 87af68e0e1e1..5ed0ab549eb8 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -82,6 +82,7 @@
 #include <linux/cpu.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
+#include <linux/syscore_ops.h>
 
 #include <asm/microcode.h>
 #include <asm/processor.h>
@@ -438,33 +439,25 @@ static int mc_sysdev_remove(struct sys_device *sys_dev)
         return 0;
 }
 
-static int mc_sysdev_resume(struct sys_device *dev)
+static struct sysdev_driver mc_sysdev_driver = {
+        .add                    = mc_sysdev_add,
+        .remove                 = mc_sysdev_remove,
+};
+
+/**
+ * mc_bp_resume - Update boot CPU microcode during resume.
+ */
+static void mc_bp_resume(void)
 {
-        int cpu = dev->id;
+        int cpu = smp_processor_id();
         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 
-        if (!cpu_online(cpu))
-                return 0;
-
-        /*
-         * All non-bootup cpus are still disabled,
-         * so only CPU 0 will apply ucode here.
-         *
-         * Moreover, there can be no concurrent
-         * updates from any other places at this point.
-         */
-        WARN_ON(cpu != 0);
-
         if (uci->valid && uci->mc)
                 microcode_ops->apply_microcode(cpu);
-
-        return 0;
 }
 
-static struct sysdev_driver mc_sysdev_driver = {
-        .add                    = mc_sysdev_add,
-        .remove                 = mc_sysdev_remove,
-        .resume                 = mc_sysdev_resume,
+static struct syscore_ops mc_syscore_ops = {
+        .resume                 = mc_bp_resume,
 };
 
 static __cpuinit int
@@ -542,6 +535,7 @@ static int __init microcode_init(void)
         if (error)
                 return error;
 
+        register_syscore_ops(&mc_syscore_ops);
         register_hotcpu_notifier(&mc_cpu_notifier);
 
         pr_info("Microcode Update Driver: v" MICROCODE_VERSION
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index c01ffa5b9b87..82ada01625b9 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -27,7 +27,7 @@
 #include <linux/kdebug.h>
 #include <linux/scatterlist.h>
 #include <linux/iommu-helper.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/io.h>
 #include <linux/gfp.h>
 #include <asm/atomic.h>
@@ -589,7 +589,7 @@ void set_up_gart_resume(u32 aper_order, u32 aper_alloc)
         aperture_alloc = aper_alloc;
 }
 
-static void gart_fixup_northbridges(struct sys_device *dev)
+static void gart_fixup_northbridges(void)
 {
         int i;
 
@@ -613,33 +613,20 @@ static void gart_fixup_northbridges(struct sys_device *dev)
         }
 }
 
-static int gart_resume(struct sys_device *dev)
+static void gart_resume(void)
 {
         pr_info("PCI-DMA: Resuming GART IOMMU\n");
 
-        gart_fixup_northbridges(dev);
+        gart_fixup_northbridges();
 
         enable_gart_translations();
-
-        return 0;
 }
 
-static int gart_suspend(struct sys_device *dev, pm_message_t state)
-{
-        return 0;
-}
-
-static struct sysdev_class gart_sysdev_class = {
-        .name           = "gart",
-        .suspend        = gart_suspend,
+static struct syscore_ops gart_syscore_ops = {
         .resume         = gart_resume,
 
 };
 
-static struct sys_device device_gart = {
-        .cls            = &gart_sysdev_class,
-};
-
 /*
  * Private Northbridge GATT initialization in case we cannot use the
  * AGP driver for some reason.
@@ -650,7 +637,7 @@ static __init int init_amd_gatt(struct agp_kern_info *info)
         unsigned aper_base, new_aper_base;
         struct pci_dev *dev;
         void *gatt;
-        int i, error;
+        int i;
 
         pr_info("PCI-DMA: Disabling AGP.\n");
 
@@ -685,12 +672,7 @@ static __init int init_amd_gatt(struct agp_kern_info *info)
 
         agp_gatt_table = gatt;
 
-        error = sysdev_class_register(&gart_sysdev_class);
-        if (!error)
-                error = sysdev_register(&device_gart);
-        if (error)
-                panic("Could not register gart_sysdev -- "
-                      "would corrupt data on next suspend");
+        register_syscore_ops(&gart_syscore_ops);
 
         flush_gart();
 
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index e2b7b0c06cdf..8dace181c88e 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -15,7 +15,7 @@
 #include <linux/notifier.h>
 #include <linux/smp.h>
 #include <linux/oprofile.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/slab.h>
 #include <linux/moduleparam.h>
 #include <linux/kdebug.h>
@@ -536,7 +536,7 @@ static void nmi_shutdown(void)
 
 #ifdef CONFIG_PM
 
-static int nmi_suspend(struct sys_device *dev, pm_message_t state)
+static int nmi_suspend(void)
 {
         /* Only one CPU left, just stop that one */
         if (nmi_enabled == 1)
@@ -544,49 +544,31 @@ static int nmi_suspend(struct sys_device *dev, pm_message_t state)
         return 0;
 }
 
-static int nmi_resume(struct sys_device *dev)
+static void nmi_resume(void)
 {
         if (nmi_enabled == 1)
                 nmi_cpu_start(NULL);
-        return 0;
 }
 
-static struct sysdev_class oprofile_sysclass = {
-        .name           = "oprofile",
+static struct syscore_ops oprofile_syscore_ops = {
         .resume         = nmi_resume,
         .suspend        = nmi_suspend,
 };
 
-static struct sys_device device_oprofile = {
-        .id     = 0,
-        .cls    = &oprofile_sysclass,
-};
-
-static int __init init_sysfs(void)
+static void __init init_suspend_resume(void)
 {
-        int error;
-
-        error = sysdev_class_register(&oprofile_sysclass);
-        if (error)
-                return error;
-
-        error = sysdev_register(&device_oprofile);
-        if (error)
-                sysdev_class_unregister(&oprofile_sysclass);
-
-        return error;
+        register_syscore_ops(&oprofile_syscore_ops);
 }
 
-static void exit_sysfs(void)
+static void exit_suspend_resume(void)
 {
-        sysdev_unregister(&device_oprofile);
-        sysdev_class_unregister(&oprofile_sysclass);
+        unregister_syscore_ops(&oprofile_syscore_ops);
 }
 
 #else
 
-static inline int  init_sysfs(void) { return 0; }
-static inline void exit_sysfs(void) { }
+static inline void init_suspend_resume(void) { }
+static inline void exit_suspend_resume(void) { }
 
 #endif /* CONFIG_PM */
 
@@ -789,9 +771,7 @@ int __init op_nmi_init(struct oprofile_operations *ops)
 
         mux_init(ops);
 
-        ret = init_sysfs();
-        if (ret)
-                return ret;
+        init_suspend_resume();
 
         printk(KERN_INFO "oprofile: using NMI interrupt.\n");
         return 0;
@@ -799,5 +779,5 @@ int __init op_nmi_init(struct oprofile_operations *ops)
 
 void op_nmi_exit(void)
 {
-        exit_sysfs();
+        exit_suspend_resume();
 }
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index d57e8d0fb823..e9e5238f3106 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -168,4 +168,11 @@ config SYS_HYPERVISOR
         bool
         default n
 
+config ARCH_NO_SYSDEV_OPS
+        bool
+        ---help---
+          To be selected by architectures that don't use sysdev class or
+          sysdev driver power management (suspend/resume) and shutdown
+          operations.
+
 endmenu
diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index f6fb54741602..fbe72da6c414 100644
--- a/drivers/base/sys.c
+++ b/drivers/base/sys.c
@@ -329,7 +329,7 @@ void sysdev_unregister(struct sys_device *sysdev)
 }
 
 
-
+#ifndef CONFIG_ARCH_NO_SYSDEV_OPS
 /**
  *      sysdev_shutdown - Shut down all system devices.
  *
@@ -524,6 +524,7 @@ int sysdev_resume(void)
         return 0;
 }
 EXPORT_SYMBOL_GPL(sysdev_resume);
+#endif /* CONFIG_ARCH_NO_SYSDEV_OPS */
 
 int __init system_bus_init(void)
 {
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 0f17ad8585d7..b03771d4787c 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -28,6 +28,7 @@
 #include <linux/cpu.h>
 #include <linux/completion.h>
 #include <linux/mutex.h>
+#include <linux/syscore_ops.h>
 
 #include <trace/events/power.h>
 
@@ -1340,35 +1341,31 @@ out:
 }
 EXPORT_SYMBOL(cpufreq_get);
 
+static struct sysdev_driver cpufreq_sysdev_driver = {
+        .add            = cpufreq_add_dev,
+        .remove         = cpufreq_remove_dev,
+};
+
 
 /**
- *      cpufreq_suspend - let the low level driver prepare for suspend
+ * cpufreq_bp_suspend - Prepare the boot CPU for system suspend.
+ *
+ * This function is only executed for the boot processor.  The other CPUs
+ * have been put offline by means of CPU hotplug.
  */
-
-static int cpufreq_suspend(struct sys_device *sysdev, pm_message_t pmsg)
+static int cpufreq_bp_suspend(void)
 {
         int ret = 0;
 
-        int cpu = sysdev->id;
+        int cpu = smp_processor_id();
         struct cpufreq_policy *cpu_policy;
 
         dprintk("suspending cpu %u\n", cpu);
 
-        if (!cpu_online(cpu))
-                return 0;
-
-        /* we may be lax here as interrupts are off. Nonetheless
-         * we need to grab the correct cpu policy, as to check
-         * whether we really run on this CPU.
-         */
-
+        /* If there's no policy for the boot CPU, we have nothing to do. */
         cpu_policy = cpufreq_cpu_get(cpu);
         if (!cpu_policy)
-                return -EINVAL;
-
-        /* only handle each CPU group once */
-        if (unlikely(cpu_policy->cpu != cpu))
-                goto out;
+                return 0;
 
         if (cpufreq_driver->suspend) {
                 ret = cpufreq_driver->suspend(cpu_policy);
@@ -1377,13 +1374,12 @@ static int cpufreq_suspend(struct sys_device *sysdev, pm_message_t pmsg)
                                         "step on CPU %u\n", cpu_policy->cpu);
         }
 
-out:
         cpufreq_cpu_put(cpu_policy);
         return ret;
 }
 
 /**
- *      cpufreq_resume -  restore proper CPU frequency handling after resume
+ * cpufreq_bp_resume - Restore proper frequency handling of the boot CPU.
  *
  *      1.) resume CPUfreq hardware support (cpufreq_driver->resume())
  *      2.) schedule call cpufreq_update_policy() ASAP as interrupts are
@@ -1391,31 +1387,23 @@ out:
  *          what we believe it to be. This is a bit later than when it
  *          should be, but nonethteless it's better than calling
  *          cpufreq_driver->get() here which might re-enable interrupts...
+ *
+ * This function is only executed for the boot CPU.  The other CPUs have not
+ * been turned on yet.
  */
-static int cpufreq_resume(struct sys_device *sysdev)
+static void cpufreq_bp_resume(void)
 {
         int ret = 0;
 
-        int cpu = sysdev->id;
+        int cpu = smp_processor_id();
         struct cpufreq_policy *cpu_policy;
 
         dprintk("resuming cpu %u\n", cpu);
 
-        if (!cpu_online(cpu))
-                return 0;
-
-        /* we may be lax here as interrupts are off. Nonetheless
-         * we need to grab the correct cpu policy, as to check
-         * whether we really run on this CPU.
-         */
-
+        /* If there's no policy for the boot CPU, we have nothing to do. */
         cpu_policy = cpufreq_cpu_get(cpu);
         if (!cpu_policy)
-                return -EINVAL;
-
-        /* only handle each CPU group once */
-        if (unlikely(cpu_policy->cpu != cpu))
-                goto fail;
+                return;
 
         if (cpufreq_driver->resume) {
                 ret = cpufreq_driver->resume(cpu_policy);
@@ -1430,14 +1418,11 @@ static int cpufreq_resume(struct sys_device *sysdev)
 
 fail:
         cpufreq_cpu_put(cpu_policy);
-        return ret;
 }
 
-static struct sysdev_driver cpufreq_sysdev_driver = {
-        .add            = cpufreq_add_dev,
-        .remove         = cpufreq_remove_dev,
-        .suspend        = cpufreq_suspend,
-        .resume         = cpufreq_resume,
+static struct syscore_ops cpufreq_syscore_ops = {
+        .suspend        = cpufreq_bp_suspend,
+        .resume         = cpufreq_bp_resume,
 };
 
 
@@ -2002,6 +1987,7 @@ static int __init cpufreq_core_init(void)
         cpufreq_global_kobject = kobject_create_and_add("cpufreq",
                                                 &cpu_sysdev_class.kset.kobj);
         BUG_ON(!cpufreq_global_kobject);
+        register_syscore_ops(&cpufreq_syscore_ops);
 
         return 0;
 }
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 4789f8e8bf7a..a4115f1afe1f 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -36,7 +36,7 @@
 #include <linux/iova.h>
 #include <linux/iommu.h>
 #include <linux/intel-iommu.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/tboot.h>
 #include <linux/dmi.h>
 #include <asm/cacheflush.h>
@@ -3135,7 +3135,7 @@ static void iommu_flush_all(void)
         }
 }
 
-static int iommu_suspend(struct sys_device *dev, pm_message_t state)
+static int iommu_suspend(void)
 {
         struct dmar_drhd_unit *drhd;
         struct intel_iommu *iommu = NULL;
@@ -3175,7 +3175,7 @@ nomem:
         return -ENOMEM;
 }
 
-static int iommu_resume(struct sys_device *dev)
+static void iommu_resume(void)
 {
         struct dmar_drhd_unit *drhd;
         struct intel_iommu *iommu = NULL;
@@ -3183,7 +3183,7 @@ static int iommu_resume(struct sys_device *dev)
 
         if (init_iommu_hw()) {
                 WARN(1, "IOMMU setup failed, DMAR can not resume!\n");
-                return -EIO;
+                return;
         }
 
         for_each_active_iommu(iommu, drhd) {
@@ -3204,40 +3204,20 @@ static int iommu_resume(struct sys_device *dev)
 
         for_each_active_iommu(iommu, drhd)
                 kfree(iommu->iommu_state);
-
-        return 0;
 }
 
-static struct sysdev_class iommu_sysclass = {
-        .name           = "iommu",
+static struct syscore_ops iommu_syscore_ops = {
         .resume         = iommu_resume,
         .suspend        = iommu_suspend,
 };
 
-static struct sys_device device_iommu = {
-        .cls    = &iommu_sysclass,
-};
-
-static int __init init_iommu_sysfs(void)
+static void __init init_iommu_pm_ops(void)
 {
-        int error;
-
-        error = sysdev_class_register(&iommu_sysclass);
-        if (error)
-                return error;
-
-        error = sysdev_register(&device_iommu);
-        if (error)
-                sysdev_class_unregister(&iommu_sysclass);
-
-        return error;
+        register_syscore_ops(&iommu_syscore_ops);
 }
 
 #else
-static int __init init_iommu_sysfs(void)
-{
-        return 0;
-}
+static inline int init_iommu_pm_ops(void) { }
 #endif  /* CONFIG_PM */
 
 /*
@@ -3320,7 +3300,7 @@ int __init intel_iommu_init(void)
 #endif
         dma_ops = &intel_dma_ops;
 
-        init_iommu_sysfs();
+        init_iommu_pm_ops();
 
         register_iommu(&intel_iommu_ops);
 
diff --git a/include/linux/device.h b/include/linux/device.h
index 144ec135875f..ab8dfc095709 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -633,8 +633,12 @@ static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
 /* drivers/base/power/shutdown.c */
 extern void device_shutdown(void);
 
+#ifndef CONFIG_ARCH_NO_SYSDEV_OPS
 /* drivers/base/sys.c */
 extern void sysdev_shutdown(void);
+#else
+static inline void sysdev_shutdown(void) { }
+#endif
 
 /* debugging and troubleshooting/diagnostic helpers. */
 extern const char *dev_driver_string(const struct device *dev);
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 6618216bb973..512e09177e57 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -529,13 +529,19 @@ struct dev_power_domain {
  */
 
 #ifdef CONFIG_PM_SLEEP
-extern void device_pm_lock(void);
+#ifndef CONFIG_ARCH_NO_SYSDEV_OPS
+extern int sysdev_suspend(pm_message_t state);
 extern int sysdev_resume(void);
+#else
+static inline int sysdev_suspend(pm_message_t state) { return 0; }
+static inline int sysdev_resume(void) { return 0; }
+#endif
+
+extern void device_pm_lock(void);
 extern void dpm_resume_noirq(pm_message_t state);
 extern void dpm_resume_end(pm_message_t state);
 
 extern void device_pm_unlock(void);
-extern int sysdev_suspend(pm_message_t state);
 extern int dpm_suspend_noirq(pm_message_t state);
 extern int dpm_suspend_start(pm_message_t state);
 
diff --git a/include/linux/sysdev.h b/include/linux/sysdev.h
index 1154c29f4101..8a75da551e4e 100644
--- a/include/linux/sysdev.h
+++ b/include/linux/sysdev.h
@@ -33,12 +33,13 @@ struct sysdev_class {
         const char *name;
         struct list_head        drivers;
         struct sysdev_class_attribute **attrs;
-
+        struct kset             kset;
+#ifndef CONFIG_ARCH_NO_SYSDEV_OPS
         /* Default operations for these types of devices */
         int     (*shutdown)(struct sys_device *);
         int     (*suspend)(struct sys_device *, pm_message_t state);
         int     (*resume)(struct sys_device *);
-        struct kset             kset;
+#endif
 };
 
 struct sysdev_class_attribute {
@@ -76,9 +77,11 @@ struct sysdev_driver {
         struct list_head        entry;
         int     (*add)(struct sys_device *);
         int     (*remove)(struct sys_device *);
+#ifndef CONFIG_ARCH_NO_SYSDEV_OPS
         int     (*shutdown)(struct sys_device *);
         int     (*suspend)(struct sys_device *, pm_message_t state);
         int     (*resume)(struct sys_device *);
+#endif
 };
 
 
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 3bd7e3d5c632..8ad5d576755e 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -14,7 +14,7 @@
 #include <linux/init.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/clocksource.h>
 #include <linux/jiffies.h>
 #include <linux/time.h>
@@ -597,13 +597,12 @@ static struct timespec timekeeping_suspend_time;
 
 /**
  * timekeeping_resume - Resumes the generic timekeeping subsystem.
- * @dev:        unused
  *
  * This is for the generic clocksource timekeeping.
  * xtime/wall_to_monotonic/jiffies/etc are
  * still managed by arch specific suspend/resume code.
  */
-static int timekeeping_resume(struct sys_device *dev)
+static void timekeeping_resume(void)
 {
         unsigned long flags;
         struct timespec ts;
@@ -632,11 +631,9 @@ static int timekeeping_resume(struct sys_device *dev)
 
         /* Resume hrtimers */
         hres_timers_resume();
-
-        return 0;
 }
 
-static int timekeeping_suspend(struct sys_device *dev, pm_message_t state)
+static int timekeeping_suspend(void)
 {
         unsigned long flags;
 
@@ -654,26 +651,18 @@ static int timekeeping_suspend(struct sys_device *dev, pm_message_t state)
 }
 
 /* sysfs resume/suspend bits for timekeeping */
-static struct sysdev_class timekeeping_sysclass = {
-        .name           = "timekeeping",
+static struct syscore_ops timekeeping_syscore_ops = {
         .resume         = timekeeping_resume,
         .suspend        = timekeeping_suspend,
 };
 
-static struct sys_device device_timer = {
-        .id             = 0,
-        .cls            = &timekeeping_sysclass,
-};
-
-static int __init timekeeping_init_device(void)
+static int __init timekeeping_init_ops(void)
 {
-        int error = sysdev_class_register(&timekeeping_sysclass);
-        if (!error)
-                error = sysdev_register(&device_timer);
-        return error;
+        register_syscore_ops(&timekeeping_syscore_ops);
+        return 0;
 }
 
-device_initcall(timekeeping_init_device);
+device_initcall(timekeeping_init_ops);
 
 /*
  * If the error is already larger, we look ahead even further
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 7bee6dc8cdb2..556e3efe5325 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -30,7 +30,7 @@
 #include <linux/debugfs.h>
 #include <linux/highmem.h>
 #include <linux/file.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/cpu.h>
 #include <linux/sched.h>
 #include <linux/cpumask.h>
@@ -2446,33 +2446,26 @@ static void kvm_exit_debug(void)
         debugfs_remove(kvm_debugfs_dir);
 }
 
-static int kvm_suspend(struct sys_device *dev, pm_message_t state)
+static int kvm_suspend(void)
 {
         if (kvm_usage_count)
                 hardware_disable_nolock(NULL);
         return 0;
 }
 
-static int kvm_resume(struct sys_device *dev)
+static void kvm_resume(void)
 {
         if (kvm_usage_count) {
                 WARN_ON(raw_spin_is_locked(&kvm_lock));
                 hardware_enable_nolock(NULL);
         }
-        return 0;
 }
 
-static struct sysdev_class kvm_sysdev_class = {
-        .name = "kvm",
+static struct syscore_ops kvm_syscore_ops = {
         .suspend = kvm_suspend,
         .resume = kvm_resume,
 };
 
-static struct sys_device kvm_sysdev = {
-        .id = 0,
-        .cls = &kvm_sysdev_class,
-};
-
 struct page *bad_page;
 pfn_t bad_pfn;
 
@@ -2556,14 +2549,6 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
                 goto out_free_2;
         register_reboot_notifier(&kvm_reboot_notifier);
 
-        r = sysdev_class_register(&kvm_sysdev_class);
-        if (r)
-                goto out_free_3;
-
-        r = sysdev_register(&kvm_sysdev);
-        if (r)
-                goto out_free_4;
-
         /* A kmem cache lets us meet the alignment requirements of fx_save. */
         if (!vcpu_align)
                 vcpu_align = __alignof__(struct kvm_vcpu);
@@ -2571,7 +2556,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
                                            0, NULL);
         if (!kvm_vcpu_cache) {
                 r = -ENOMEM;
-                goto out_free_5;
+                goto out_free_3;
         }
 
         r = kvm_async_pf_init();
@@ -2588,6 +2573,8 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
                 goto out_unreg;
         }
 
+        register_syscore_ops(&kvm_syscore_ops);
+
         kvm_preempt_ops.sched_in = kvm_sched_in;
         kvm_preempt_ops.sched_out = kvm_sched_out;
 
@@ -2599,10 +2586,6 @@ out_unreg:
         kvm_async_pf_deinit();
 out_free:
         kmem_cache_destroy(kvm_vcpu_cache);
-out_free_5:
-        sysdev_unregister(&kvm_sysdev);
-out_free_4:
-        sysdev_class_unregister(&kvm_sysdev_class);
 out_free_3:
         unregister_reboot_notifier(&kvm_reboot_notifier);
         unregister_cpu_notifier(&kvm_cpu_notifier);
@@ -2630,8 +2613,7 @@ void kvm_exit(void)
         misc_deregister(&kvm_dev);
         kmem_cache_destroy(kvm_vcpu_cache);
         kvm_async_pf_deinit();
-        sysdev_unregister(&kvm_sysdev);
-        sysdev_class_unregister(&kvm_sysdev_class);
+        unregister_syscore_ops(&kvm_syscore_ops);
         unregister_reboot_notifier(&kvm_reboot_notifier);
         unregister_cpu_notifier(&kvm_cpu_notifier);
         on_each_cpu(hardware_disable_nolock, NULL, 1);