29 files changed, 436 insertions, 321 deletions

diff --git a/Documentation/ABI/testing/debugfs-olpc b/Documentation/ABI/testing/debugfs-olpc
new file mode 100644
index 000000000000..bd76cc6d55f9
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-olpc
@@ -0,0 +1,16 @@
+What:           /sys/kernel/debug/olpc-ec/cmd
+Date:           Dec 2011
+KernelVersion:  3.4
+Contact:        devel@lists.laptop.org
+Description:
+
+A generic interface for executing OLPC Embedded Controller commands and
+reading their responses.
+
+To execute a command, write data with the format: CC:N A A A A
+CC is the (hex) command, N is the count of expected reply bytes, and A A A A
+are optional (hex) arguments.
+
+To read the response (if any), read from the generic node after executing
+a command. Hex reply bytes will be returned, *whether or not* they came from
+the immediately previous command.
diff --git a/arch/mips/configs/db1300_defconfig b/arch/mips/configs/db1300_defconfig
index c38b190151c4..3590ab5d9791 100644
--- a/arch/mips/configs/db1300_defconfig
+++ b/arch/mips/configs/db1300_defconfig
@@ -133,7 +133,7 @@ CONFIG_BLK_DEV_BSG=y
 CONFIG_IOSCHED_NOOP=y
 CONFIG_DEFAULT_NOOP=y
 CONFIG_DEFAULT_IOSCHED="noop"
-CONFIG_INLINE_SPIN_UNLOCK=y
+# CONFIG_UNINLINE_SPIN_UNLOCK is not set
 CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
 CONFIG_INLINE_READ_UNLOCK=y
 CONFIG_INLINE_READ_UNLOCK_IRQ=y
diff --git a/arch/x86/configs/i386_defconfig b/arch/x86/configs/i386_defconfig
index 2bf18059fbea..119db67dcb03 100644
--- a/arch/x86/configs/i386_defconfig
+++ b/arch/x86/configs/i386_defconfig
@@ -15,23 +15,28 @@ CONFIG_CPUSETS=y
 CONFIG_CGROUP_CPUACCT=y
 CONFIG_RESOURCE_COUNTERS=y
 CONFIG_CGROUP_SCHED=y
-CONFIG_UTS_NS=y
-CONFIG_IPC_NS=y
-CONFIG_USER_NS=y
-CONFIG_PID_NS=y
-CONFIG_NET_NS=y
 CONFIG_BLK_DEV_INITRD=y
-CONFIG_KALLSYMS_EXTRA_PASS=y
 # CONFIG_COMPAT_BRK is not set
 CONFIG_PROFILING=y
 CONFIG_KPROBES=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_MODULE_FORCE_UNLOAD=y
+CONFIG_PARTITION_ADVANCED=y
+CONFIG_OSF_PARTITION=y
+CONFIG_AMIGA_PARTITION=y
+CONFIG_MAC_PARTITION=y
+CONFIG_BSD_DISKLABEL=y
+CONFIG_MINIX_SUBPARTITION=y
+CONFIG_SOLARIS_X86_PARTITION=y
+CONFIG_UNIXWARE_DISKLABEL=y
+CONFIG_SGI_PARTITION=y
+CONFIG_SUN_PARTITION=y
+CONFIG_KARMA_PARTITION=y
+CONFIG_EFI_PARTITION=y
 CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y
 CONFIG_SMP=y
-CONFIG_SPARSE_IRQ=y
 CONFIG_X86_GENERIC=y
 CONFIG_HPET_TIMER=y
 CONFIG_SCHED_SMT=y
@@ -51,14 +56,12 @@ CONFIG_HZ_1000=y
 CONFIG_KEXEC=y
 CONFIG_CRASH_DUMP=y
 # CONFIG_COMPAT_VDSO is not set
-CONFIG_PM=y
+CONFIG_HIBERNATION=y
 CONFIG_PM_DEBUG=y
 CONFIG_PM_TRACE_RTC=y
-CONFIG_HIBERNATION=y
 CONFIG_ACPI_PROCFS=y
 CONFIG_ACPI_DOCK=y
 CONFIG_CPU_FREQ=y
-CONFIG_CPU_FREQ_DEBUG=y
 # CONFIG_CPU_FREQ_STAT is not set
 CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
 CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
@@ -69,7 +72,6 @@ CONFIG_PCI_MSI=y
 CONFIG_PCCARD=y
 CONFIG_YENTA=y
 CONFIG_HOTPLUG_PCI=y
-CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y
 CONFIG_BINFMT_MISC=y
 CONFIG_NET=y
 CONFIG_PACKET=y
@@ -120,7 +122,6 @@ CONFIG_NF_CONNTRACK_IPV4=y
 CONFIG_IP_NF_IPTABLES=y
 CONFIG_IP_NF_FILTER=y
 CONFIG_IP_NF_TARGET_REJECT=y
-CONFIG_IP_NF_TARGET_LOG=y
 CONFIG_IP_NF_TARGET_ULOG=y
 CONFIG_NF_NAT=y
 CONFIG_IP_NF_TARGET_MASQUERADE=y
@@ -128,7 +129,6 @@ CONFIG_IP_NF_MANGLE=y
 CONFIG_NF_CONNTRACK_IPV6=y
 CONFIG_IP6_NF_IPTABLES=y
 CONFIG_IP6_NF_MATCH_IPV6HEADER=y
-CONFIG_IP6_NF_TARGET_LOG=y
 CONFIG_IP6_NF_FILTER=y
 CONFIG_IP6_NF_TARGET_REJECT=y
 CONFIG_IP6_NF_MANGLE=y
@@ -169,25 +169,20 @@ CONFIG_DM_ZERO=y
 CONFIG_MACINTOSH_DRIVERS=y
 CONFIG_MAC_EMUMOUSEBTN=y
 CONFIG_NETDEVICES=y
-CONFIG_NET_ETHERNET=y
-CONFIG_NET_VENDOR_3COM=y
+CONFIG_NETCONSOLE=y
+CONFIG_BNX2=y
+CONFIG_TIGON3=y
 CONFIG_NET_TULIP=y
-CONFIG_NET_PCI=y
-CONFIG_FORCEDETH=y
 CONFIG_E100=y
+CONFIG_E1000=y
+CONFIG_E1000E=y
+CONFIG_SKY2=y
 CONFIG_NE2K_PCI=y
+CONFIG_FORCEDETH=y
 CONFIG_8139TOO=y
 # CONFIG_8139TOO_PIO is not set
-CONFIG_E1000=y
-CONFIG_E1000E=y
 CONFIG_R8169=y
-CONFIG_SKY2=y
-CONFIG_TIGON3=y
-CONFIG_BNX2=y
-CONFIG_TR=y
-CONFIG_NET_PCMCIA=y
 CONFIG_FDDI=y
-CONFIG_NETCONSOLE=y
 CONFIG_INPUT_POLLDEV=y
 # CONFIG_INPUT_MOUSEDEV_PSAUX is not set
 CONFIG_INPUT_EVDEV=y
@@ -196,6 +191,7 @@ CONFIG_INPUT_TABLET=y
 CONFIG_INPUT_TOUCHSCREEN=y
 CONFIG_INPUT_MISC=y
 CONFIG_VT_HW_CONSOLE_BINDING=y
+# CONFIG_LEGACY_PTYS is not set
 CONFIG_SERIAL_NONSTANDARD=y
 CONFIG_SERIAL_8250=y
 CONFIG_SERIAL_8250_CONSOLE=y
@@ -205,7 +201,6 @@ CONFIG_SERIAL_8250_MANY_PORTS=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y
 CONFIG_SERIAL_8250_DETECT_IRQ=y
 CONFIG_SERIAL_8250_RSA=y
-# CONFIG_LEGACY_PTYS is not set
 CONFIG_HW_RANDOM=y
 CONFIG_NVRAM=y
 CONFIG_HPET=y
@@ -220,7 +215,6 @@ CONFIG_DRM_I915=y
 CONFIG_FB_MODE_HELPERS=y
 CONFIG_FB_TILEBLITTING=y
 CONFIG_FB_EFI=y
-CONFIG_BACKLIGHT_LCD_SUPPORT=y
 # CONFIG_LCD_CLASS_DEVICE is not set
 CONFIG_VGACON_SOFT_SCROLLBACK=y
 CONFIG_LOGO=y
@@ -283,7 +277,6 @@ CONFIG_ZISOFS=y
 CONFIG_MSDOS_FS=y
 CONFIG_VFAT_FS=y
 CONFIG_PROC_KCORE=y
-CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y
 CONFIG_HUGETLBFS=y
 CONFIG_NFS_FS=y
@@ -291,18 +284,6 @@ CONFIG_NFS_V3=y
 CONFIG_NFS_V3_ACL=y
 CONFIG_NFS_V4=y
 CONFIG_ROOT_NFS=y
-CONFIG_PARTITION_ADVANCED=y
-CONFIG_OSF_PARTITION=y
-CONFIG_AMIGA_PARTITION=y
-CONFIG_MAC_PARTITION=y
-CONFIG_BSD_DISKLABEL=y
-CONFIG_MINIX_SUBPARTITION=y
-CONFIG_SOLARIS_X86_PARTITION=y
-CONFIG_UNIXWARE_DISKLABEL=y
-CONFIG_SGI_PARTITION=y
-CONFIG_SUN_PARTITION=y
-CONFIG_KARMA_PARTITION=y
-CONFIG_EFI_PARTITION=y
 CONFIG_NLS_DEFAULT="utf8"
 CONFIG_NLS_CODEPAGE_437=y
 CONFIG_NLS_ASCII=y
@@ -317,13 +298,12 @@ CONFIG_DEBUG_KERNEL=y
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_SCHEDSTATS=y
 CONFIG_TIMER_STATS=y
-# CONFIG_RCU_CPU_STALL_DETECTOR is not set
+CONFIG_DEBUG_STACK_USAGE=y
 CONFIG_SYSCTL_SYSCALL_CHECK=y
 CONFIG_BLK_DEV_IO_TRACE=y
 CONFIG_PROVIDE_OHCI1394_DMA_INIT=y
 CONFIG_EARLY_PRINTK_DBGP=y
 CONFIG_DEBUG_STACKOVERFLOW=y
-CONFIG_DEBUG_STACK_USAGE=y
 # CONFIG_DEBUG_RODATA_TEST is not set
 CONFIG_DEBUG_NX_TEST=m
 CONFIG_DEBUG_BOOT_PARAMS=y
diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig
index 058a35b8286c..76eb2903809f 100644
--- a/arch/x86/configs/x86_64_defconfig
+++ b/arch/x86/configs/x86_64_defconfig
@@ -1,4 +1,3 @@
-CONFIG_64BIT=y
 CONFIG_EXPERIMENTAL=y
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_SYSVIPC=y
@@ -16,26 +15,29 @@ CONFIG_CPUSETS=y
 CONFIG_CGROUP_CPUACCT=y
 CONFIG_RESOURCE_COUNTERS=y
 CONFIG_CGROUP_SCHED=y
-CONFIG_UTS_NS=y
-CONFIG_IPC_NS=y
-CONFIG_USER_NS=y
-CONFIG_PID_NS=y
-CONFIG_NET_NS=y
 CONFIG_BLK_DEV_INITRD=y
-CONFIG_KALLSYMS_EXTRA_PASS=y
 # CONFIG_COMPAT_BRK is not set
 CONFIG_PROFILING=y
 CONFIG_KPROBES=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_MODULE_FORCE_UNLOAD=y
+CONFIG_PARTITION_ADVANCED=y
+CONFIG_OSF_PARTITION=y
+CONFIG_AMIGA_PARTITION=y
+CONFIG_MAC_PARTITION=y
+CONFIG_BSD_DISKLABEL=y
+CONFIG_MINIX_SUBPARTITION=y
+CONFIG_SOLARIS_X86_PARTITION=y
+CONFIG_UNIXWARE_DISKLABEL=y
+CONFIG_SGI_PARTITION=y
+CONFIG_SUN_PARTITION=y
+CONFIG_KARMA_PARTITION=y
+CONFIG_EFI_PARTITION=y
 CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y
 CONFIG_SMP=y
-CONFIG_SPARSE_IRQ=y
 CONFIG_CALGARY_IOMMU=y
-CONFIG_AMD_IOMMU=y
-CONFIG_AMD_IOMMU_STATS=y
 CONFIG_NR_CPUS=64
 CONFIG_SCHED_SMT=y
 CONFIG_PREEMPT_VOLUNTARY=y
@@ -53,27 +55,22 @@ CONFIG_HZ_1000=y
 CONFIG_KEXEC=y
 CONFIG_CRASH_DUMP=y
 # CONFIG_COMPAT_VDSO is not set
-CONFIG_PM=y
+CONFIG_HIBERNATION=y
 CONFIG_PM_DEBUG=y
 CONFIG_PM_TRACE_RTC=y
-CONFIG_HIBERNATION=y
 CONFIG_ACPI_PROCFS=y
 CONFIG_ACPI_DOCK=y
 CONFIG_CPU_FREQ=y
-CONFIG_CPU_FREQ_DEBUG=y
 # CONFIG_CPU_FREQ_STAT is not set
 CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
 CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
 CONFIG_CPU_FREQ_GOV_ONDEMAND=y
 CONFIG_X86_ACPI_CPUFREQ=y
 CONFIG_PCI_MMCONFIG=y
-CONFIG_INTEL_IOMMU=y
-# CONFIG_INTEL_IOMMU_DEFAULT_ON is not set
 CONFIG_PCIEPORTBUS=y
 CONFIG_PCCARD=y
 CONFIG_YENTA=y
 CONFIG_HOTPLUG_PCI=y
-CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y
 CONFIG_BINFMT_MISC=y
 CONFIG_IA32_EMULATION=y
 CONFIG_NET=y
@@ -125,7 +122,6 @@ CONFIG_NF_CONNTRACK_IPV4=y
 CONFIG_IP_NF_IPTABLES=y
 CONFIG_IP_NF_FILTER=y
 CONFIG_IP_NF_TARGET_REJECT=y
-CONFIG_IP_NF_TARGET_LOG=y
 CONFIG_IP_NF_TARGET_ULOG=y
 CONFIG_NF_NAT=y
 CONFIG_IP_NF_TARGET_MASQUERADE=y
@@ -133,7 +129,6 @@ CONFIG_IP_NF_MANGLE=y
 CONFIG_NF_CONNTRACK_IPV6=y
 CONFIG_IP6_NF_IPTABLES=y
 CONFIG_IP6_NF_MATCH_IPV6HEADER=y
-CONFIG_IP6_NF_TARGET_LOG=y
 CONFIG_IP6_NF_FILTER=y
 CONFIG_IP6_NF_TARGET_REJECT=y
 CONFIG_IP6_NF_MANGLE=y
@@ -172,20 +167,15 @@ CONFIG_DM_ZERO=y
 CONFIG_MACINTOSH_DRIVERS=y
 CONFIG_MAC_EMUMOUSEBTN=y
 CONFIG_NETDEVICES=y
-CONFIG_NET_ETHERNET=y
-CONFIG_NET_VENDOR_3COM=y
+CONFIG_NETCONSOLE=y
+CONFIG_TIGON3=y
 CONFIG_NET_TULIP=y
-CONFIG_NET_PCI=y
-CONFIG_FORCEDETH=y
 CONFIG_E100=y
-CONFIG_8139TOO=y
 CONFIG_E1000=y
 CONFIG_SKY2=y
-CONFIG_TIGON3=y
-CONFIG_TR=y
-CONFIG_NET_PCMCIA=y
+CONFIG_FORCEDETH=y
+CONFIG_8139TOO=y
 CONFIG_FDDI=y
-CONFIG_NETCONSOLE=y
 CONFIG_INPUT_POLLDEV=y
 # CONFIG_INPUT_MOUSEDEV_PSAUX is not set
 CONFIG_INPUT_EVDEV=y
@@ -194,6 +184,7 @@ CONFIG_INPUT_TABLET=y
 CONFIG_INPUT_TOUCHSCREEN=y
 CONFIG_INPUT_MISC=y
 CONFIG_VT_HW_CONSOLE_BINDING=y
+# CONFIG_LEGACY_PTYS is not set
 CONFIG_SERIAL_NONSTANDARD=y
 CONFIG_SERIAL_8250=y
 CONFIG_SERIAL_8250_CONSOLE=y
@@ -203,7 +194,6 @@ CONFIG_SERIAL_8250_MANY_PORTS=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y
 CONFIG_SERIAL_8250_DETECT_IRQ=y
 CONFIG_SERIAL_8250_RSA=y
-# CONFIG_LEGACY_PTYS is not set
 CONFIG_HW_RANDOM=y
 # CONFIG_HW_RANDOM_INTEL is not set
 # CONFIG_HW_RANDOM_AMD is not set
@@ -221,7 +211,6 @@ CONFIG_DRM_I915_KMS=y
 CONFIG_FB_MODE_HELPERS=y
 CONFIG_FB_TILEBLITTING=y
 CONFIG_FB_EFI=y
-CONFIG_BACKLIGHT_LCD_SUPPORT=y
 # CONFIG_LCD_CLASS_DEVICE is not set
 CONFIG_VGACON_SOFT_SCROLLBACK=y
 CONFIG_LOGO=y
@@ -268,6 +257,10 @@ CONFIG_RTC_CLASS=y
 # CONFIG_RTC_HCTOSYS is not set
 CONFIG_DMADEVICES=y
 CONFIG_EEEPC_LAPTOP=y
+CONFIG_AMD_IOMMU=y
+CONFIG_AMD_IOMMU_STATS=y
+CONFIG_INTEL_IOMMU=y
+# CONFIG_INTEL_IOMMU_DEFAULT_ON is not set
 CONFIG_EFI_VARS=y
 CONFIG_EXT3_FS=y
 # CONFIG_EXT3_DEFAULTS_TO_ORDERED is not set
@@ -284,7 +277,6 @@ CONFIG_ZISOFS=y
 CONFIG_MSDOS_FS=y
 CONFIG_VFAT_FS=y
 CONFIG_PROC_KCORE=y
-CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y
 CONFIG_HUGETLBFS=y
 CONFIG_NFS_FS=y
@@ -292,18 +284,6 @@ CONFIG_NFS_V3=y
 CONFIG_NFS_V3_ACL=y
 CONFIG_NFS_V4=y
 CONFIG_ROOT_NFS=y
-CONFIG_PARTITION_ADVANCED=y
-CONFIG_OSF_PARTITION=y
-CONFIG_AMIGA_PARTITION=y
-CONFIG_MAC_PARTITION=y
-CONFIG_BSD_DISKLABEL=y
-CONFIG_MINIX_SUBPARTITION=y
-CONFIG_SOLARIS_X86_PARTITION=y
-CONFIG_UNIXWARE_DISKLABEL=y
-CONFIG_SGI_PARTITION=y
-CONFIG_SUN_PARTITION=y
-CONFIG_KARMA_PARTITION=y
-CONFIG_EFI_PARTITION=y
 CONFIG_NLS_DEFAULT="utf8"
 CONFIG_NLS_CODEPAGE_437=y
 CONFIG_NLS_ASCII=y
@@ -317,13 +297,12 @@ CONFIG_DEBUG_KERNEL=y
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_SCHEDSTATS=y
 CONFIG_TIMER_STATS=y
-# CONFIG_RCU_CPU_STALL_DETECTOR is not set
+CONFIG_DEBUG_STACK_USAGE=y
 CONFIG_SYSCTL_SYSCALL_CHECK=y
 CONFIG_BLK_DEV_IO_TRACE=y
 CONFIG_PROVIDE_OHCI1394_DMA_INIT=y
 CONFIG_EARLY_PRINTK_DBGP=y
 CONFIG_DEBUG_STACKOVERFLOW=y
-CONFIG_DEBUG_STACK_USAGE=y
 # CONFIG_DEBUG_RODATA_TEST is not set
 CONFIG_DEBUG_NX_TEST=m
 CONFIG_DEBUG_BOOT_PARAMS=y
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 4b2caeefe1a2..d85410171260 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -534,7 +534,7 @@ static inline unsigned int read_apic_id(void)
 
 static inline int default_apic_id_valid(int apicid)
 {
-        return x2apic_mode || (apicid < 255);
+        return (apicid < 255);
 }
 
 extern void default_setup_apic_routing(void);
diff --git a/arch/x86/include/asm/idle.h b/arch/x86/include/asm/idle.h
index f49253d75710..c5d1785373ed 100644
--- a/arch/x86/include/asm/idle.h
+++ b/arch/x86/include/asm/idle.h
@@ -14,6 +14,7 @@ void exit_idle(void);
 #else /* !CONFIG_X86_64 */
 static inline void enter_idle(void) { }
 static inline void exit_idle(void) { }
+static inline void __exit_idle(void) { }
 #endif /* CONFIG_X86_64 */
 
 void amd_e400_remove_cpu(int cpu);
diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 690d1cc9a877..2c4943de5150 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -21,6 +21,15 @@
 #define IO_APIC_REDIR_LEVEL_TRIGGER     (1 << 15)
 #define IO_APIC_REDIR_MASKED            (1 << 16)
 
+struct io_apic_ops {
+        void            (*init)  (void);
+        unsigned int    (*read)  (unsigned int apic, unsigned int reg);
+        void            (*write) (unsigned int apic, unsigned int reg, unsigned int value);
+        void            (*modify)(unsigned int apic, unsigned int reg, unsigned int value);
+};
+
+void __init set_io_apic_ops(const struct io_apic_ops *);
+
 /*
  * The structure of the IO-APIC:
  */
diff --git a/arch/x86/include/asm/x2apic.h b/arch/x86/include/asm/x2apic.h
index 6bf5b8e478c0..92e54abf89e0 100644
--- a/arch/x86/include/asm/x2apic.h
+++ b/arch/x86/include/asm/x2apic.h
@@ -18,6 +18,11 @@ static const struct cpumask *x2apic_target_cpus(void)
         return cpu_online_mask;
 }
 
+static int x2apic_apic_id_valid(int apicid)
+{
+        return 1;
+}
+
 static int x2apic_apic_id_registered(void)
 {
         return 1;
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 406ed77216d0..0f42c2f44311 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -239,7 +239,7 @@ acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
          * to not preallocating memory for all NR_CPUS
          * when we use CPU hotplug.
          */
-        if (!cpu_has_x2apic && (apic_id >= 0xff) && enabled)
+        if (!apic->apic_id_valid(apic_id) && enabled)
                 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
         else
                 acpi_register_lapic(apic_id, enabled);
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 2eec05b6d1b8..11544d8f1e97 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -383,20 +383,25 @@ static inline int eilvt_entry_is_changeable(unsigned int old, unsigned int new)
 
 static unsigned int reserve_eilvt_offset(int offset, unsigned int new)
 {
-        unsigned int rsvd;                      /* 0: uninitialized */
+        unsigned int rsvd, vector;
 
         if (offset >= APIC_EILVT_NR_MAX)
                 return ~0;
 
-        rsvd = atomic_read(&eilvt_offsets[offset]) & ~APIC_EILVT_MASKED;
+        rsvd = atomic_read(&eilvt_offsets[offset]);
         do {
-                if (rsvd &&
-                    !eilvt_entry_is_changeable(rsvd, new))
+                vector = rsvd & ~APIC_EILVT_MASKED;     /* 0: unassigned */
+                if (vector && !eilvt_entry_is_changeable(vector, new))
                         /* may not change if vectors are different */
                         return rsvd;
                 rsvd = atomic_cmpxchg(&eilvt_offsets[offset], rsvd, new);
         } while (rsvd != new);
 
+        rsvd &= ~APIC_EILVT_MASKED;
+        if (rsvd && rsvd != vector)
+                pr_info("LVT offset %d assigned for vector 0x%02x\n",
+                        offset, rsvd);
+
         return new;
 }
 
diff --git a/arch/x86/kernel/apic/apic_numachip.c b/arch/x86/kernel/apic/apic_numachip.c
index d9ea5f331ac5..899803e03214 100644
--- a/arch/x86/kernel/apic/apic_numachip.c
+++ b/arch/x86/kernel/apic/apic_numachip.c
@@ -229,11 +229,10 @@ static int __init numachip_system_init(void)
 }
 early_initcall(numachip_system_init);
 
-static int __cpuinit numachip_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+static int numachip_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
         if (!strncmp(oem_id, "NUMASC", 6)) {
                 numachip_system = 1;
-                setup_force_cpu_cap(X86_FEATURE_X2APIC);
                 return 1;
         }
 
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 6d10a66fc5a9..e88300d8e80a 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -64,9 +64,28 @@
 #include <asm/apic.h>
 
 #define __apicdebuginit(type) static type __init
+
 #define for_each_irq_pin(entry, head) \
         for (entry = head; entry; entry = entry->next)
 
+static void             __init __ioapic_init_mappings(void);
+
+static unsigned int     __io_apic_read  (unsigned int apic, unsigned int reg);
+static void             __io_apic_write (unsigned int apic, unsigned int reg, unsigned int val);
+static void             __io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val);
+
+static struct io_apic_ops io_apic_ops = {
+        .init   = __ioapic_init_mappings,
+        .read   = __io_apic_read,
+        .write  = __io_apic_write,
+        .modify = __io_apic_modify,
+};
+
+void __init set_io_apic_ops(const struct io_apic_ops *ops)
+{
+        io_apic_ops = *ops;
+}
+
 /*
  *      Is the SiS APIC rmw bug present ?
  *      -1 = don't know, 0 = no, 1 = yes
@@ -294,6 +313,22 @@ static void free_irq_at(unsigned int at, struct irq_cfg *cfg)
         irq_free_desc(at);
 }
 
+static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
+{
+        return io_apic_ops.read(apic, reg);
+}
+
+static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+{
+        io_apic_ops.write(apic, reg, value);
+}
+
+static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
+{
+        io_apic_ops.modify(apic, reg, value);
+}
+
+
 struct io_apic {
         unsigned int index;
         unsigned int unused[3];
@@ -314,16 +349,17 @@ static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
         writel(vector, &io_apic->eoi);
 }
 
-static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
+static unsigned int __io_apic_read(unsigned int apic, unsigned int reg)
 {
         struct io_apic __iomem *io_apic = io_apic_base(apic);
         writel(reg, &io_apic->index);
         return readl(&io_apic->data);
 }
 
-static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+static void __io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
 {
         struct io_apic __iomem *io_apic = io_apic_base(apic);
+
         writel(reg, &io_apic->index);
         writel(value, &io_apic->data);
 }
@@ -334,7 +370,7 @@ static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned i
  *
  * Older SiS APIC requires we rewrite the index register
  */
-static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
+static void __io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
 {
         struct io_apic __iomem *io_apic = io_apic_base(apic);
 
@@ -377,6 +413,7 @@ static struct IO_APIC_route_entry __ioapic_read_entry(int apic, int pin)
 
         eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
         eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
+
         return eu.entry;
 }
 
@@ -384,9 +421,11 @@ static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
 {
         union entry_union eu;
         unsigned long flags;
+
         raw_spin_lock_irqsave(&ioapic_lock, flags);
         eu.entry = __ioapic_read_entry(apic, pin);
         raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
         return eu.entry;
 }
 
@@ -396,8 +435,7 @@ static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
  * the interrupt, and we need to make sure the entry is fully populated
  * before that happens.
  */
-static void
-__ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
+static void __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
 {
         union entry_union eu = {{0, 0}};
 
@@ -409,6 +447,7 @@ __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
 {
         unsigned long flags;
+
         raw_spin_lock_irqsave(&ioapic_lock, flags);
         __ioapic_write_entry(apic, pin, e);
         raw_spin_unlock_irqrestore(&ioapic_lock, flags);
@@ -435,8 +474,7 @@ static void ioapic_mask_entry(int apic, int pin)
  * shared ISA-space IRQs, so we have to support them. We are super
  * fast in the common case, and fast for shared ISA-space IRQs.
  */
-static int
-__add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
+static int __add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
 {
         struct irq_pin_list **last, *entry;
 
@@ -521,6 +559,7 @@ static void io_apic_sync(struct irq_pin_list *entry)
          * a dummy read from the IO-APIC
          */
         struct io_apic __iomem *io_apic;
+
         io_apic = io_apic_base(entry->apic);
         readl(&io_apic->data);
 }
@@ -2512,21 +2551,73 @@ static void ack_apic_edge(struct irq_data *data)
 
 atomic_t irq_mis_count;
 
-static void ack_apic_level(struct irq_data *data)
-{
-        struct irq_cfg *cfg = data->chip_data;
-        int i, do_unmask_irq = 0, irq = data->irq;
-        unsigned long v;
-
-        irq_complete_move(cfg);
 #ifdef CONFIG_GENERIC_PENDING_IRQ
+static inline bool ioapic_irqd_mask(struct irq_data *data, struct irq_cfg *cfg)
+{
         /* If we are moving the irq we need to mask it */
         if (unlikely(irqd_is_setaffinity_pending(data))) {
-                do_unmask_irq = 1;
                 mask_ioapic(cfg);
+                return true;
         }
+        return false;
+}
+
+static inline void ioapic_irqd_unmask(struct irq_data *data,
+                                      struct irq_cfg *cfg, bool masked)
+{
+        if (unlikely(masked)) {
+                /* Only migrate the irq if the ack has been received.
+                 *
+                 * On rare occasions the broadcast level triggered ack gets
+                 * delayed going to ioapics, and if we reprogram the
+                 * vector while Remote IRR is still set the irq will never
+                 * fire again.
+                 *
+                 * To prevent this scenario we read the Remote IRR bit
+                 * of the ioapic.  This has two effects.
+                 * - On any sane system the read of the ioapic will
+                 *   flush writes (and acks) going to the ioapic from
+                 *   this cpu.
+                 * - We get to see if the ACK has actually been delivered.
+                 *
+                 * Based on failed experiments of reprogramming the
+                 * ioapic entry from outside of irq context starting
+                 * with masking the ioapic entry and then polling until
+                 * Remote IRR was clear before reprogramming the
+                 * ioapic I don't trust the Remote IRR bit to be
+                 * completey accurate.
+                 *
+                 * However there appears to be no other way to plug
+                 * this race, so if the Remote IRR bit is not
+                 * accurate and is causing problems then it is a hardware bug
+                 * and you can go talk to the chipset vendor about it.
+                 */
+                if (!io_apic_level_ack_pending(cfg))
+                        irq_move_masked_irq(data);
+                unmask_ioapic(cfg);
+        }
+}
+#else
+static inline bool ioapic_irqd_mask(struct irq_data *data, struct irq_cfg *cfg)
+{
+        return false;
+}
+static inline void ioapic_irqd_unmask(struct irq_data *data,
+                                      struct irq_cfg *cfg, bool masked)
+{
+}
 #endif
 
+static void ack_apic_level(struct irq_data *data)
+{
+        struct irq_cfg *cfg = data->chip_data;
+        int i, irq = data->irq;
+        unsigned long v;
+        bool masked;
+
+        irq_complete_move(cfg);
+        masked = ioapic_irqd_mask(data, cfg);
+
         /*
          * It appears there is an erratum which affects at least version 0x11
          * of I/O APIC (that's the 82093AA and cores integrated into various
@@ -2581,38 +2672,7 @@ static void ack_apic_level(struct irq_data *data)
                 eoi_ioapic_irq(irq, cfg);
         }
 
-        /* Now we can move and renable the irq */
-        if (unlikely(do_unmask_irq)) {
-                /* Only migrate the irq if the ack has been received.
-                 *
-                 * On rare occasions the broadcast level triggered ack gets
-                 * delayed going to ioapics, and if we reprogram the
-                 * vector while Remote IRR is still set the irq will never
-                 * fire again.
-                 *
-                 * To prevent this scenario we read the Remote IRR bit
-                 * of the ioapic.  This has two effects.
-                 * - On any sane system the read of the ioapic will
-                 *   flush writes (and acks) going to the ioapic from
-                 *   this cpu.
-                 * - We get to see if the ACK has actually been delivered.
-                 *
-                 * Based on failed experiments of reprogramming the
-                 * ioapic entry from outside of irq context starting
-                 * with masking the ioapic entry and then polling until
-                 * Remote IRR was clear before reprogramming the
-                 * ioapic I don't trust the Remote IRR bit to be
-                 * completey accurate.
-                 *
-                 * However there appears to be no other way to plug
-                 * this race, so if the Remote IRR bit is not
-                 * accurate and is causing problems then it is a hardware bug
-                 * and you can go talk to the chipset vendor about it.
-                 */
-                if (!io_apic_level_ack_pending(cfg))
-                        irq_move_masked_irq(data);
-                unmask_ioapic(cfg);
-        }
+        ioapic_irqd_unmask(data, cfg, masked);
 }
 
 #ifdef CONFIG_IRQ_REMAP
@@ -3873,6 +3933,11 @@ static struct resource * __init ioapic_setup_resources(int nr_ioapics)
 
 void __init ioapic_and_gsi_init(void)
 {
+        io_apic_ops.init();
+}
+
+static void __init __ioapic_init_mappings(void)
+{
         unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
         struct resource *ioapic_res;
         int i;
diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index 9193713060a9..48f3103b3c93 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -213,7 +213,7 @@ static struct apic apic_x2apic_cluster = {
         .name                           = "cluster x2apic",
         .probe                          = x2apic_cluster_probe,
         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
-        .apic_id_valid                  = default_apic_id_valid,
+        .apic_id_valid                  = x2apic_apic_id_valid,
         .apic_id_registered             = x2apic_apic_id_registered,
 
         .irq_delivery_mode              = dest_LowestPrio,
diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c
index bcd1db6eaca9..8a778db45e3a 100644
--- a/arch/x86/kernel/apic/x2apic_phys.c
+++ b/arch/x86/kernel/apic/x2apic_phys.c
@@ -119,7 +119,7 @@ static struct apic apic_x2apic_phys = {
         .name                           = "physical x2apic",
         .probe                          = x2apic_phys_probe,
         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
-        .apic_id_valid                  = default_apic_id_valid,
+        .apic_id_valid                  = x2apic_apic_id_valid,
         .apic_id_registered             = x2apic_apic_id_registered,
 
         .irq_delivery_mode              = dest_Fixed,
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index fc4771425852..87bfa69e216e 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -266,6 +266,11 @@ static void uv_send_IPI_all(int vector)
         uv_send_IPI_mask(cpu_online_mask, vector);
 }
 
+static int uv_apic_id_valid(int apicid)
+{
+        return 1;
+}
+
 static int uv_apic_id_registered(void)
 {
         return 1;
@@ -351,7 +356,7 @@ static struct apic __refdata apic_x2apic_uv_x = {
         .name                           = "UV large system",
         .probe                          = uv_probe,
         .acpi_madt_oem_check            = uv_acpi_madt_oem_check,
-        .apic_id_valid                  = default_apic_id_valid,
+        .apic_id_valid                  = uv_apic_id_valid,
         .apic_id_registered             = uv_apic_id_registered,
 
         .irq_delivery_mode              = dest_Fixed,
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index e49477444fff..67e258362a3d 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -999,7 +999,7 @@ void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
         else
                 printk(KERN_CONT "\n");
 
-        __print_cpu_msr();
+        print_cpu_msr(c);
 }
 
 void __cpuinit print_cpu_msr(struct cpuinfo_x86 *c)
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 4025fe4f928f..90bf130f09bc 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -37,13 +37,16 @@ print_ftrace_graph_addr(unsigned long addr, void *data,
                         const struct stacktrace_ops *ops,
                         struct thread_info *tinfo, int *graph)
 {
-        struct task_struct *task = tinfo->task;
+        struct task_struct *task;
         unsigned long ret_addr;
-        int index = task->curr_ret_stack;
+        int index;
 
         if (addr != (unsigned long)return_to_handler)
                 return;
 
+        task = tinfo->task;
+        index = task->curr_ret_stack;
+
         if (!task->ret_stack || index < *graph)
                 return;
 
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 9b24f36eb55f..a33afaa5ddb7 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -12,6 +12,9 @@
 #include <linux/user-return-notifier.h>
 #include <linux/dmi.h>
 #include <linux/utsname.h>
+#include <linux/stackprotector.h>
+#include <linux/tick.h>
+#include <linux/cpuidle.h>
 #include <trace/events/power.h>
 #include <linux/hw_breakpoint.h>
 #include <asm/cpu.h>
@@ -22,6 +25,24 @@
 #include <asm/i387.h>
 #include <asm/fpu-internal.h>
 #include <asm/debugreg.h>
+#include <asm/nmi.h>
+
+#ifdef CONFIG_X86_64
+static DEFINE_PER_CPU(unsigned char, is_idle);
+static ATOMIC_NOTIFIER_HEAD(idle_notifier);
+
+void idle_notifier_register(struct notifier_block *n)
+{
+        atomic_notifier_chain_register(&idle_notifier, n);
+}
+EXPORT_SYMBOL_GPL(idle_notifier_register);
+
+void idle_notifier_unregister(struct notifier_block *n)
+{
+        atomic_notifier_chain_unregister(&idle_notifier, n);
+}
+EXPORT_SYMBOL_GPL(idle_notifier_unregister);
+#endif
 
 struct kmem_cache *task_xstate_cachep;
 EXPORT_SYMBOL_GPL(task_xstate_cachep);
@@ -370,6 +391,99 @@ static inline int hlt_use_halt(void)
 }
 #endif
 
+#ifndef CONFIG_SMP
+static inline void play_dead(void)
+{
+        BUG();
+}
+#endif
+
+#ifdef CONFIG_X86_64
+void enter_idle(void)
+{
+        percpu_write(is_idle, 1);
+        atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL);
+}
+
+static void __exit_idle(void)
+{
+        if (x86_test_and_clear_bit_percpu(0, is_idle) == 0)
+                return;
+        atomic_notifier_call_chain(&idle_notifier, IDLE_END, NULL);
+}
+
+/* Called from interrupts to signify idle end */
+void exit_idle(void)
+{
+        /* idle loop has pid 0 */
+        if (current->pid)
+                return;
+        __exit_idle();
+}
+#endif
+
+/*
+ * The idle thread. There's no useful work to be
+ * done, so just try to conserve power and have a
+ * low exit latency (ie sit in a loop waiting for
+ * somebody to say that they'd like to reschedule)
+ */
+void cpu_idle(void)
+{
+        /*
+         * If we're the non-boot CPU, nothing set the stack canary up
+         * for us.  CPU0 already has it initialized but no harm in
+         * doing it again.  This is a good place for updating it, as
+         * we wont ever return from this function (so the invalid
+         * canaries already on the stack wont ever trigger).
+         */
+        boot_init_stack_canary();
+        current_thread_info()->status |= TS_POLLING;
+
+        while (1) {
+                tick_nohz_idle_enter();
+
+                while (!need_resched()) {
+                        rmb();
+
+                        if (cpu_is_offline(smp_processor_id()))
+                                play_dead();
+
+                        /*
+                         * Idle routines should keep interrupts disabled
+                         * from here on, until they go to idle.
+                         * Otherwise, idle callbacks can misfire.
+                         */
+                        local_touch_nmi();
+                        local_irq_disable();
+
+                        enter_idle();
+
+                        /* Don't trace irqs off for idle */
+                        stop_critical_timings();
+
+                        /* enter_idle() needs rcu for notifiers */
+                        rcu_idle_enter();
+
+                        if (cpuidle_idle_call())
+                                pm_idle();
+
+                        rcu_idle_exit();
+                        start_critical_timings();
+
+                        /* In many cases the interrupt that ended idle
+                           has already called exit_idle. But some idle
+                           loops can be woken up without interrupt. */
+                        __exit_idle();
+                }
+
+                tick_nohz_idle_exit();
+                preempt_enable_no_resched();
+                schedule();
+                preempt_disable();
+        }
+}
+
 /*
  * We use this if we don't have any better
  * idle routine..
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index aae4f4bbbe88..ae6847303e26 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -9,7 +9,6 @@
  * This file handles the architecture-dependent parts of process handling..
  */
 
-#include <linux/stackprotector.h>
 #include <linux/cpu.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
@@ -31,14 +30,12 @@
 #include <linux/kallsyms.h>
 #include <linux/ptrace.h>
 #include <linux/personality.h>
-#include <linux/tick.h>
 #include <linux/percpu.h>
 #include <linux/prctl.h>
 #include <linux/ftrace.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
 #include <linux/kdebug.h>
-#include <linux/cpuidle.h>
 
 #include <asm/pgtable.h>
 #include <asm/ldt.h>
@@ -57,7 +54,6 @@
 #include <asm/idle.h>
 #include <asm/syscalls.h>
 #include <asm/debugreg.h>
-#include <asm/nmi.h>
 #include <asm/switch_to.h>
 
 asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
@@ -70,60 +66,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
         return ((unsigned long *)tsk->thread.sp)[3];
 }
 
-#ifndef CONFIG_SMP
-static inline void play_dead(void)
-{
-        BUG();
-}
-#endif
-
-/*
- * The idle thread. There's no useful work to be
- * done, so just try to conserve power and have a
- * low exit latency (ie sit in a loop waiting for
- * somebody to say that they'd like to reschedule)
- */
-void cpu_idle(void)
-{
-        int cpu = smp_processor_id();
-
-        /*
-         * If we're the non-boot CPU, nothing set the stack canary up
-         * for us.  CPU0 already has it initialized but no harm in
-         * doing it again.  This is a good place for updating it, as
-         * we wont ever return from this function (so the invalid
-         * canaries already on the stack wont ever trigger).
-         */
-        boot_init_stack_canary();
-
-        current_thread_info()->status |= TS_POLLING;
-
-        /* endless idle loop with no priority at all */
-        while (1) {
-                tick_nohz_idle_enter();
-                rcu_idle_enter();
-                while (!need_resched()) {
-
-                        check_pgt_cache();
-                        rmb();
-
-                        if (cpu_is_offline(cpu))
-                                play_dead();
-
-                        local_touch_nmi();
-                        local_irq_disable();
-                        /* Don't trace irqs off for idle */
-                        stop_critical_timings();
-                        if (cpuidle_idle_call())
-                                pm_idle();
-                        start_critical_timings();
-                }
-                rcu_idle_exit();
-                tick_nohz_idle_exit();
-                schedule_preempt_disabled();
-        }
-}
-
 void __show_regs(struct pt_regs *regs, int all)
 {
         unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 61270e8d428a..2b154da0b6d3 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -14,7 +14,6 @@
  * This file handles the architecture-dependent parts of process handling..
  */
 
-#include <linux/stackprotector.h>
 #include <linux/cpu.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
@@ -32,12 +31,10 @@
 #include <linux/notifier.h>
 #include <linux/kprobes.h>
 #include <linux/kdebug.h>
-#include <linux/tick.h>
 #include <linux/prctl.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
 #include <linux/ftrace.h>
-#include <linux/cpuidle.h>
 
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -51,115 +48,11 @@
 #include <asm/idle.h>
 #include <asm/syscalls.h>
 #include <asm/debugreg.h>
-#include <asm/nmi.h>
 #include <asm/switch_to.h>
 
 asmlinkage extern void ret_from_fork(void);
 
 DEFINE_PER_CPU(unsigned long, old_rsp);
-static DEFINE_PER_CPU(unsigned char, is_idle);
-
-static ATOMIC_NOTIFIER_HEAD(idle_notifier);
-
-void idle_notifier_register(struct notifier_block *n)
-{
-        atomic_notifier_chain_register(&idle_notifier, n);
-}
-EXPORT_SYMBOL_GPL(idle_notifier_register);
-
-void idle_notifier_unregister(struct notifier_block *n)
-{
-        atomic_notifier_chain_unregister(&idle_notifier, n);
-}
-EXPORT_SYMBOL_GPL(idle_notifier_unregister);
-
-void enter_idle(void)
-{
-        percpu_write(is_idle, 1);
-        atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL);
-}
-
-static void __exit_idle(void)
-{
-        if (x86_test_and_clear_bit_percpu(0, is_idle) == 0)
-                return;
-        atomic_notifier_call_chain(&idle_notifier, IDLE_END, NULL);
-}
-
-/* Called from interrupts to signify idle end */
-void exit_idle(void)
-{
-        /* idle loop has pid 0 */
-        if (current->pid)
-                return;
-        __exit_idle();
-}
-
-#ifndef CONFIG_SMP
-static inline void play_dead(void)
-{
-        BUG();
-}
-#endif
-
-/*
- * The idle thread. There's no useful work to be
- * done, so just try to conserve power and have a
- * low exit latency (ie sit in a loop waiting for
- * somebody to say that they'd like to reschedule)
- */
-void cpu_idle(void)
-{
-        current_thread_info()->status |= TS_POLLING;
-
-        /*
-         * If we're the non-boot CPU, nothing set the stack canary up
-         * for us.  CPU0 already has it initialized but no harm in
-         * doing it again.  This is a good place for updating it, as
-         * we wont ever return from this function (so the invalid
-         * canaries already on the stack wont ever trigger).
-         */
-        boot_init_stack_canary();
-
-        /* endless idle loop with no priority at all */
-        while (1) {
-                tick_nohz_idle_enter();
-                while (!need_resched()) {
-
-                        rmb();
-
-                        if (cpu_is_offline(smp_processor_id()))
-                                play_dead();
-                        /*
-                         * Idle routines should keep interrupts disabled
-                         * from here on, until they go to idle.
-                         * Otherwise, idle callbacks can misfire.
-                         */
-                        local_touch_nmi();
-                        local_irq_disable();
-                        enter_idle();
-                        /* Don't trace irqs off for idle */
-                        stop_critical_timings();
-
-                        /* enter_idle() needs rcu for notifiers */
-                        rcu_idle_enter();
-
-                        if (cpuidle_idle_call())
-                                pm_idle();
-
-                        rcu_idle_exit();
-                        start_critical_timings();
-
-                        /* In many cases the interrupt that ended idle
-                           has already called exit_idle. But some idle
-                           loops can be woken up without interrupt. */
-                        __exit_idle();
-                }
-
-                tick_nohz_idle_exit();
-                schedule_preempt_disabled();
-        }
-}
 
 /* Prints also some state that isn't saved in the pt_regs */
 void __show_regs(struct pt_regs *regs, int all)
diff --git a/arch/x86/kernel/tls.c b/arch/x86/kernel/tls.c
index 73920e4c6dc5..9d9d2f9e77a5 100644
--- a/arch/x86/kernel/tls.c
+++ b/arch/x86/kernel/tls.c
@@ -162,7 +162,7 @@ int regset_tls_get(struct task_struct *target, const struct user_regset *regset,
 {
         const struct desc_struct *tls;
 
-        if (pos > GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
+        if (pos >= GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
             (pos % sizeof(struct user_desc)) != 0 ||
             (count % sizeof(struct user_desc)) != 0)
                 return -EINVAL;
@@ -197,7 +197,7 @@ int regset_tls_set(struct task_struct *target, const struct user_regset *regset,
         struct user_desc infobuf[GDT_ENTRY_TLS_ENTRIES];
         const struct user_desc *info;
 
-        if (pos > GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
+        if (pos >= GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
             (pos % sizeof(struct user_desc)) != 0 ||
             (count % sizeof(struct user_desc)) != 0)
                 return -EINVAL;
diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
index 1c1c4f46a7c1..efb5b4b93711 100644
--- a/arch/x86/mm/srat.c
+++ b/arch/x86/mm/srat.c
@@ -70,7 +70,7 @@ acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
                 return;
         pxm = pa->proximity_domain;
         apic_id = pa->apic_id;
-        if (!cpu_has_x2apic && (apic_id >= 0xff)) {
+        if (!apic->apic_id_valid(apic_id)) {
                 printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
                          pxm, apic_id);
                 return;
diff --git a/arch/x86/platform/olpc/olpc.c b/arch/x86/platform/olpc/olpc.c
index 7cce722667b8..a4bee53c2e54 100644
--- a/arch/x86/platform/olpc/olpc.c
+++ b/arch/x86/platform/olpc/olpc.c
@@ -20,6 +20,8 @@
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <linux/syscore_ops.h>
+#include <linux/debugfs.h>
+#include <linux/mutex.h>
 
 #include <asm/geode.h>
 #include <asm/setup.h>
@@ -31,6 +33,15 @@ EXPORT_SYMBOL_GPL(olpc_platform_info);
 
 static DEFINE_SPINLOCK(ec_lock);
 
+/* debugfs interface to EC commands */
+#define EC_MAX_CMD_ARGS (5 + 1) /* cmd byte + 5 args */
+#define EC_MAX_CMD_REPLY (8)
+
+static struct dentry *ec_debugfs_dir;
+static DEFINE_MUTEX(ec_debugfs_cmd_lock);
+static unsigned char ec_debugfs_resp[EC_MAX_CMD_REPLY];
+static unsigned int ec_debugfs_resp_bytes;
+
 /* EC event mask to be applied during suspend (defining wakeup sources). */
 static u16 ec_wakeup_mask;
 
@@ -269,6 +280,91 @@ int olpc_ec_sci_query(u16 *sci_value)
 }
 EXPORT_SYMBOL_GPL(olpc_ec_sci_query);
 
+static ssize_t ec_debugfs_cmd_write(struct file *file, const char __user *buf,
+                                    size_t size, loff_t *ppos)
+{
+        int i, m;
+        unsigned char ec_cmd[EC_MAX_CMD_ARGS];
+        unsigned int ec_cmd_int[EC_MAX_CMD_ARGS];
+        char cmdbuf[64];
+        int ec_cmd_bytes;
+
+        mutex_lock(&ec_debugfs_cmd_lock);
+
+        size = simple_write_to_buffer(cmdbuf, sizeof(cmdbuf), ppos, buf, size);
+
+        m = sscanf(cmdbuf, "%x:%u %x %x %x %x %x", &ec_cmd_int[0],
+                   &ec_debugfs_resp_bytes,
+                   &ec_cmd_int[1], &ec_cmd_int[2], &ec_cmd_int[3],
+                   &ec_cmd_int[4], &ec_cmd_int[5]);
+        if (m < 2 || ec_debugfs_resp_bytes > EC_MAX_CMD_REPLY) {
+                /* reset to prevent overflow on read */
+                ec_debugfs_resp_bytes = 0;
+
+                printk(KERN_DEBUG "olpc-ec: bad ec cmd:  "
+                       "cmd:response-count [arg1 [arg2 ...]]\n");
+                size = -EINVAL;
+                goto out;
+        }
+
+        /* convert scanf'd ints to char */
+        ec_cmd_bytes = m - 2;
+        for (i = 0; i <= ec_cmd_bytes; i++)
+                ec_cmd[i] = ec_cmd_int[i];
+
+        printk(KERN_DEBUG "olpc-ec: debugfs cmd 0x%02x with %d args "
+               "%02x %02x %02x %02x %02x, want %d returns\n",
+               ec_cmd[0], ec_cmd_bytes, ec_cmd[1], ec_cmd[2], ec_cmd[3],
+               ec_cmd[4], ec_cmd[5], ec_debugfs_resp_bytes);
+
+        olpc_ec_cmd(ec_cmd[0], (ec_cmd_bytes == 0) ? NULL : &ec_cmd[1],
+                    ec_cmd_bytes, ec_debugfs_resp, ec_debugfs_resp_bytes);
+
+        printk(KERN_DEBUG "olpc-ec: response "
+               "%02x %02x %02x %02x %02x %02x %02x %02x (%d bytes expected)\n",
+               ec_debugfs_resp[0], ec_debugfs_resp[1], ec_debugfs_resp[2],
+               ec_debugfs_resp[3], ec_debugfs_resp[4], ec_debugfs_resp[5],
+               ec_debugfs_resp[6], ec_debugfs_resp[7], ec_debugfs_resp_bytes);
+
+out:
+        mutex_unlock(&ec_debugfs_cmd_lock);
+        return size;
+}
+
+static ssize_t ec_debugfs_cmd_read(struct file *file, char __user *buf,
+                                   size_t size, loff_t *ppos)
+{
+        unsigned int i, r;
+        char *rp;
+        char respbuf[64];
+
+        mutex_lock(&ec_debugfs_cmd_lock);
+        rp = respbuf;
+        rp += sprintf(rp, "%02x", ec_debugfs_resp[0]);
+        for (i = 1; i < ec_debugfs_resp_bytes; i++)
+                rp += sprintf(rp, ", %02x", ec_debugfs_resp[i]);
+        mutex_unlock(&ec_debugfs_cmd_lock);
+        rp += sprintf(rp, "\n");
+
+        r = rp - respbuf;
+        return simple_read_from_buffer(buf, size, ppos, respbuf, r);
+}
+
+static const struct file_operations ec_debugfs_genops = {
+        .write   = ec_debugfs_cmd_write,
+        .read    = ec_debugfs_cmd_read,
+};
+
+static void setup_debugfs(void)
+{
+        ec_debugfs_dir = debugfs_create_dir("olpc-ec", 0);
+        if (ec_debugfs_dir == ERR_PTR(-ENODEV))
+                return;
+
+        debugfs_create_file("cmd", 0600, ec_debugfs_dir, NULL,
+                            &ec_debugfs_genops);
+}
+
 static int olpc_ec_suspend(void)
 {
         return olpc_ec_mask_write(ec_wakeup_mask);
@@ -372,6 +468,7 @@ static int __init olpc_init(void)
         }
 
         register_syscore_ops(&olpc_syscore_ops);
+        setup_debugfs();
 
         return 0;
 }
diff --git a/arch/xtensa/configs/iss_defconfig b/arch/xtensa/configs/iss_defconfig
index f932b30b47fb..ddab37b24741 100644
--- a/arch/xtensa/configs/iss_defconfig
+++ b/arch/xtensa/configs/iss_defconfig
@@ -113,7 +113,7 @@ CONFIG_DEFAULT_IOSCHED="noop"
 # CONFIG_INLINE_SPIN_LOCK_BH is not set
 # CONFIG_INLINE_SPIN_LOCK_IRQ is not set
 # CONFIG_INLINE_SPIN_LOCK_IRQSAVE is not set
-CONFIG_INLINE_SPIN_UNLOCK=y
+# CONFIG_UNINLINE_SPIN_UNLOCK is not set
 # CONFIG_INLINE_SPIN_UNLOCK_BH is not set
 CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
 # CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE is not set
diff --git a/include/linux/spinlock_api_smp.h b/include/linux/spinlock_api_smp.h
index e253ccd7a604..51df117abe46 100644
--- a/include/linux/spinlock_api_smp.h
+++ b/include/linux/spinlock_api_smp.h
@@ -67,7 +67,7 @@ _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
 #define _raw_spin_trylock_bh(lock) __raw_spin_trylock_bh(lock)
 #endif
 
-#ifdef CONFIG_INLINE_SPIN_UNLOCK
+#ifndef CONFIG_UNINLINE_SPIN_UNLOCK
 #define _raw_spin_unlock(lock) __raw_spin_unlock(lock)
 #endif
 
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
index 5068e2a4e75f..2251882daf53 100644
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@@ -124,8 +124,8 @@ config INLINE_SPIN_LOCK_IRQSAVE
         def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
                  ARCH_INLINE_SPIN_LOCK_IRQSAVE
 
-config INLINE_SPIN_UNLOCK
-        def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_SPIN_UNLOCK)
+config UNINLINE_SPIN_UNLOCK
+        bool
 
 config INLINE_SPIN_UNLOCK_BH
         def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_UNLOCK_BH
diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index 24e7cb0ba26a..3f9c97419f02 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -36,6 +36,7 @@ config PREEMPT_VOLUNTARY
 config PREEMPT
         bool "Preemptible Kernel (Low-Latency Desktop)"
         select PREEMPT_COUNT
+        select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
         help
           This option reduces the latency of the kernel by making
           all kernel code (that is not executing in a critical section)
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index 84c7d96918bf..5cdd8065a3ce 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -163,7 +163,7 @@ void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)
 EXPORT_SYMBOL(_raw_spin_lock_bh);
 #endif
 
-#ifndef CONFIG_INLINE_SPIN_UNLOCK
+#ifdef CONFIG_UNINLINE_SPIN_UNLOCK
 void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)
 {
         __raw_spin_unlock(lock);
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index f7af95d304c5..6777153f18f3 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -499,6 +499,7 @@ config RT_MUTEX_TESTER
 config DEBUG_SPINLOCK
         bool "Spinlock and rw-lock debugging: basic checks"
         depends on DEBUG_KERNEL
+        select UNINLINE_SPIN_UNLOCK
         help
           Say Y here and build SMP to catch missing spinlock initialization
           and certain other kinds of spinlock errors commonly made.  This is