The AMD64 Architecture Programmer's Manual Volume 2, on page
89 mentions: "If the processor is running in 64-bit mode (L=1),
the only valid setting of the D bit is 0." This matches
with what the code does.
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1361825650-14031-4-git-send-email-konrad.wilk@oracle.comSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Both the PowerPC hypervisor and Xen hypervisor can utilize the
hvc driver.

Cc: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1361825650-14031-3-git-send-email-konrad.wilk@oracle.com
Cc: <stable@vger.kernel.org>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

The earlyprintk for Xen PV guests utilizes a simple hypercall
(console_io) to provide output to Xen emergency console.

Note that the Xen hypervisor should be booted with 'loglevel=all'
to output said information.
Reported-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1361825650-14031-2-git-send-email-konrad.wilk@oracle.com
Cc: <stable@vger.kernel.org>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Reflect this dependency in Kconfig, to prevent build failures.

Shorten the config description as suggested by Borislav Petkov.

Finding a suitable memory area to store the modified table(s) has been
taken over from arch/x86/kernel/setup.c and makes use of max_low_pfn_mapped:
memblock_find_in_range(0, max_low_pfn_mapped,...)
This one is X86 specific. It may not be hard to extend this functionality
for other ACPI aware architectures if there is need for.

For now make this feature only available for X86 to avoid build failures on
IA64, compare with:
https://bugzilla.kernel.org/show_bug.cgi?id=54091Signed-off-by: NThomas Renninger <trenn@suse.de>
Link: http://lkml.kernel.org/r/1361538742-67599-3-git-send-email-trenn@suse.deSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Without this patch any kernel code that reads kernel memory in
non present kernel pte/pmds (as set by pageattr.c) will crash.

With this kernel code:

static struct page *crash_page;
static unsigned long *crash_address;
[..]
	crash_page = alloc_pages(GFP_KERNEL, 9);
	crash_address = page_address(crash_page);
	if (set_memory_np((unsigned long)crash_address, 1))
		printk("set_memory_np failure\n");
[..]

The kernel will crash if inside the "crash tool" one would try
to read the memory at the not present address.

crash> p crash_address
crash_address = $8 = (long unsigned int *) 0xffff88023c000000
crash> rd 0xffff88023c000000
[ *lockup* ]

The lockup happens because _PAGE_GLOBAL and _PAGE_PROTNONE
shares the same bit, and pageattr leaves _PAGE_GLOBAL set on a
kernel pte which is then mistaken as _PAGE_PROTNONE (so
pte_present returns true by mistake and the kernel fault then
gets confused and loops).

With THP the same can happen after we taught pmd_present to
check _PAGE_PROTNONE and _PAGE_PSE in commit
027ef6c8 ("mm: thp: fix pmd_present for
split_huge_page and PROT_NONE with THP").  THP has the same
problem with _PAGE_GLOBAL as the 4k pages, but it also has a
problem with _PAGE_PSE, which must be cleared too.

After the patch is applied copy_user correctly returns -EFAULT
and doesn't lockup anymore.

crash> p crash_address
crash_address = $9 = (long unsigned int *) 0xffff88023c000000
crash> rd 0xffff88023c000000
rd: read error: kernel virtual address: ffff88023c000000  type:
"64-bit KVADDR"
Signed-off-by: NAndrea Arcangeli <aarcange@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NIngo Molnar <mingo@kernel.org>

I got a report for a minor regression introduced by commit
027ef6c8 ("mm: thp: fix pmd_present for split_huge_page and
PROT_NONE with THP").

So the problem is, pageattr creates kernel pagetables (pte and
pmds) that breaks pte_present/pmd_present and the patch above
exposed this invariant breakage for pmd_present.

The same problem already existed for the pte and pte_present and
it was fixed by commit 660a293e ("x86, mm: Make
spurious_fault check explicitly check the PRESENT bit") (if it
wasn't for that commit, it wouldn't even be a regression).  That
fix avoids the pagefault to use pte_present.  I could follow
through by stopping using pmd_present/pmd_huge too.

However I think it's more robust to fix pageattr and to clear
the PSE/GLOBAL bitflags too in addition to the present bitflag.
So the kernel page fault can keep using the regular
pte_present/pmd_present/pmd_huge.

The confusion arises because _PAGE_GLOBAL and _PAGE_PROTNONE are
sharing the same bit, and in the pmd case we pretend _PAGE_PSE
to be set only in present pmds (to facilitate split_huge_page
final tlb flush).
Signed-off-by: NAndrea Arcangeli <aarcange@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NIngo Molnar <mingo@kernel.org>

If we aren't debugging per_cpu maps, the cpu's node is stored in
per_cpu variable numa_node.  If `node' is NUMA_NO_NODE, it means
the caller wants to clear the cpu's node.  So we should also
call set_cpu_numa_node() in this case.
Signed-off-by: NWen Congyang <wency@cn.fujitsu.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NIngo Molnar <mingo@kernel.org>

commit 1de63d60 ("efi: Clear EFI_RUNTIME_SERVICES rather than
EFI_BOOT by "noefi" boot parameter") attempted to make "noefi" true to
its documentation and disable EFI runtime services to prevent the
bricking bug described in commit e0094244 ("samsung-laptop:
Disable on EFI hardware"). However, it's not possible to clear
EFI_RUNTIME_SERVICES from an early param function because
EFI_RUNTIME_SERVICES is set in efi_init() *after* parse_early_param().

This resulted in "noefi" effectively becoming a no-op and no longer
providing users with a way to disable EFI, which is bad for those
users that have buggy machines.
Reported-by: NWalt Nelson Jr <walt0924@gmail.com>
Cc: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NMatt Fleming <matt.fleming@intel.com>
Link: http://lkml.kernel.org/r/1361392572-25657-1-git-send-email-matt@console-pimps.orgSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Including " lapic " in the kernel cmdline on an x86-64 kernel
makes it panic while parsing early params -- e.g. with no user
visible output.

Fix this bug by ensuring arg is non-NULL before passing it to
strncmp().
Reported-by: NPaX Team <pageexec@freemail.hu>
Signed-off-by: NMathias Krause <minipli@googlemail.com>
Acked-by: NDavid Rientjes <rientjes@google.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1361303227-13174-1-git-send-email-minipli@googlemail.com
Cc: stable@vger.kernel.org	# v3.8
Signed-off-by: NIngo Molnar <mingo@kernel.org>

Pull async changes from Tejun Heo:
 "These are followups for the earlier deadlock issue involving async
  ending up waiting for itself through block requesting module[1].  The
  following changes are made by these commits.

   - Instead of requesting default elevator on each request_queue init,
     block now requests it once early during boot.

   - Kmod triggers warning if invoked from an async worker.

   - Async synchronization implementation has been reimplemented.  It's
     a lot simpler now."

* 'for-3.9-async' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  async: initialise list heads to fix crash
  async: replace list of active domains with global list of pending items
  async: keep pending tasks on async_domain and remove async_pending
  async: use ULLONG_MAX for infinity cookie value
  async: bring sanity to the use of words domain and running
  async, kmod: warn on synchronous request_module() from async workers
  block: don't request module during elevator init
  init, block: try to load default elevator module early during boot

Pull workqueue changes from Tejun Heo:
 "A lot of reorganization is going on mostly to prepare for worker pools
  with custom attributes so that workqueue can replace custom pool
  implementations in places including writeback and btrfs and make CPU
  assignment in crypto more flexible.

  workqueue evolved from purely per-cpu design and implementation, so
  there are a lot of assumptions regarding being bound to CPUs and even
  unbound workqueues are implemented as an extension of the model -
  workqueues running on the special unbound CPU.  Bulk of changes this
  round are about promoting worker_pools as the top level abstraction
  replacing global_cwq (global cpu workqueue).  At this point, I'm
  fairly confident about getting custom worker pools working pretty soon
  and ready for the next merge window.

  Lai's patches are replacing the convoluted mb() dancing workqueue has
  been doing with much simpler mechanism which only depends on
  assignment atomicity of long.  For details, please read the commit
  message of 0b3dae68 ("workqueue: simplify is-work-item-queued-here
  test").  While the change ends up adding one pointer to struct
  delayed_work, the inflation in percentage is less than five percent
  and it decouples delayed_work logic a lot more cleaner from usual work
  handling, removes the unusual memory barrier dancing, and allows for
  further simplification, so I think the trade-off is acceptable.

  There will be two more workqueue related pull requests and there are
  some shared commits among them.  I'll write further pull requests
  assuming this pull request is pulled first."

* 'for-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: (37 commits)
  workqueue: un-GPL function delayed_work_timer_fn()
  workqueue: rename cpu_workqueue to pool_workqueue
  workqueue: reimplement is_chained_work() using current_wq_worker()
  workqueue: fix is_chained_work() regression
  workqueue: pick cwq instead of pool in __queue_work()
  workqueue: make get_work_pool_id() cheaper
  workqueue: move nr_running into worker_pool
  workqueue: cosmetic update in try_to_grab_pending()
  workqueue: simplify is-work-item-queued-here test
  workqueue: make work->data point to pool after try_to_grab_pending()
  workqueue: add delayed_work->wq to simplify reentrancy handling
  workqueue: make work_busy() test WORK_STRUCT_PENDING first
  workqueue: replace WORK_CPU_NONE/LAST with WORK_CPU_END
  workqueue: post global_cwq removal cleanups
  workqueue: rename nr_running variables
  workqueue: remove global_cwq
  workqueue: remove worker_pool->gcwq
  workqueue: replace for_each_worker_pool() with for_each_std_worker_pool()
  workqueue: make freezing/thawing per-pool
  workqueue: make hotplug processing per-pool
  ...

Pull workqueue [delayed_]work_pending() cleanups from Tejun Heo:
 "This is part of on-going cleanups to remove / minimize usages of
  workqueue interfaces which are deprecated and/or misleading.

  This round drops a number of usages of [delayed_]work_pending(), which
  are dangerous as they lack any form of synchronization and thus often
  lead to buggy / unnecessary code.  There are a couple legitimate use
  cases in kernel.  Hopefully, they can be converted and
  [delayed_]work_pending() can be removed completely.  Even if not,
  removing most of misuses should make it more difficult to find
  examples of misuses and thus slow down growth of them.

  These changes are independent from other workqueue changes."

* 'for-3.9-cleanups' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  wimax/i2400m: fix i2400m->wake_tx_skb handling
  kprobes: fix wait_for_kprobe_optimizer()
  ipw2x00: simplify scan_event handling
  video/exynos: don't use [delayed_]work_pending()
  tty/max3100: don't use [delayed_]work_pending()
  x86/mce: don't use [delayed_]work_pending()
  rfkill: don't use [delayed_]work_pending()
  wl1251: don't use [delayed_]work_pending()
  thinkpad_acpi: don't use [delayed_]work_pending()
  mwifiex: don't use [delayed_]work_pending()
  sja1000: don't use [delayed_]work_pending()

Pull x86 UV3 support update from Ingo Molnar:
 "Support for the SGI Ultraviolet System 3 (UV3) platform - the upcoming
  third major iteration and upscaling of the SGI UV supercomputing
  platform."

* 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, uv, uv3: Trim MMR register definitions after code changes for SGI UV3
  x86, uv, uv3: Check current gru hub support for SGI UV3
  x86, uv, uv3: Update Time Support for SGI UV3
  x86, uv, uv3: Update x2apic Support for SGI UV3
  x86, uv, uv3: Update Hub Info for SGI UV3
  x86, uv, uv3: Update ACPI Check to include SGI UV3
  x86, uv, uv3: Update MMR register definitions for SGI Ultraviolet System 3 (UV3)

Pull x86 platform changes from Ingo Molnar:

 - Support for the Technologic Systems TS-5500 platform, by Vivien
   Didelot

 - Improved NUMA support on AMD systems:

   Add support for federated systems where multiple memory controllers
   can exist and see each other over multiple PCI domains.  This
   basically means that AMD node ids can be more than 8 now and the code
   handling this is taught to incorporate PCI domain into those IDs.

 - Support for the Goldfish virtual Android emulator, by Jun Nakajima,
   Intel, Google, et al.

 - Misc fixlets.

* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: Add TS-5500 platform support
  x86/srat: Simplify memory affinity init error handling
  x86/apb/timer: Remove unnecessary "if"
  goldfish: platform device for x86
  amd64_edac: Fix type usage in NB IDs and memory ranges
  amd64_edac: Fix PCI function lookup
  x86, AMD, NB: Use u16 for northbridge IDs in amd_get_nb_id
  x86, AMD, NB: Add multi-domain support

Pull x86/hyperv changes from Ingo Molnar:
 "The biggest change is support for Windows 8's improved hypervisor
  interrupt model on the Linux Hyper-V guest subsystem code side.

  Smallish fixes otherwise."

* 'x86-hyperv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, hyperv: HYPERV depends on X86_LOCAL_APIC
  X86: Handle Hyper-V vmbus interrupts as special hypervisor interrupts
  X86: Add a check to catch Xen emulation of Hyper-V
  x86: Hyper-V: register clocksource only if its advertised

Pull x86/debug changes from Ingo Molnar:
 "Two init annotations and a built-in memtest speedup"

* 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/memtest: Shorten time for tests
  x86: Convert a few mistaken __cpuinit annotations to __init
  x86/EFI: Properly init-annotate BGRT code

Pull x86 cleanup patches from Ingo Molnar:
 "Misc smaller cleanups"

* 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: ptrace.c only needs export.h and not the full module.h
  x86, apb_timer: remove unused variable percpu_timer
  um: don't compare a pointer to 0
  arch/x86/platform/uv: use ARRAY_SIZE where possible

Pull two x86 kernel build changes from Ingo Molnar:
 "The first change modifies how 'make oldconfig' works on cross-bitness
  situations on x86.  It was felt the new behavior of preserving the
  bitness of the .config is more logical.  This is a leftover of the
  merge.

  The second change eliminates a Perl warning.  (There's another, more
  complete fix resulting of this warning fix, which second fix in flight
  to you via the kbuild tree, which will remove the timeconst.pl script
  altogether.)"

* 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timeconst.pl: Eliminate Perl warning
  x86: Default to ARCH=x86 to avoid overriding CONFIG_64BIT

Pull x86 bootup changes from Ingo Molnar:
 "Deal with bootloaders which fail to initialize unknown fields in
  boot_params to zero, by sanitizing boot params passed in.

  This unbreaks versions of kexec-utils.  Other bootloaders do not
  appear to show sensitivity to this change, but it's a possibility for
  breakage nevertheless."

* 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, boot: Sanitize boot_params if not zeroed on creation

Pull x86/asm changes from Ingo Molnar:
 "The biggest change (by line count) is the unification of the XOR code
  and then the introduction of an additional SSE based XOR assembly
  method.

  The other bigger change is the head_32.S rework/cleanup by Borislav
  Petkov.

  Last but not least there's the usual laundry list of small but
  dangerous (and hopefully perfectly tested) changes to subtle low level
  x86 code, plus cleanups."

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, head_32: Give the 6 label a real name
  x86, head_32: Remove second CPUID detection from default_entry
  x86: Detect CPUID support early at boot
  x86, head_32: Remove i386 pieces
  x86: Require MOVBE feature in cpuid when we use it
  x86: Enable ARCH_USE_BUILTIN_BSWAP
  x86/xor: Add alternative SSE implementation only prefetching once per 64-byte line
  x86/xor: Unify SSE-base xor-block routines
  x86: Fix a typo
  x86/mm: Fix the argument passed to sync_global_pgds()
  x86/mm: Convert update_mmu_cache() and update_mmu_cache_pmd() to functions
  ix86: Tighten asmlinkage_protect() constraints

Pull x86/apic changes from Ingo Molnar:
 "Main changes:

   - Multiple MSI support added to the APIC, PCI and AHCI code - acked
     by all relevant maintainers, by Alexander Gordeev.

     The advantage is that multiple AHCI ports can have multiple MSI
     irqs assigned, and can thus spread to multiple CPUs.

     [ Drivers can make use of this new facility via the
       pci_enable_msi_block_auto() method ]

   - x86 IOAPIC code from interrupt remapping cleanups from Joerg
     Roedel:

     These patches move all interrupt remapping specific checks out of
     the x86 core code and replaces the respective call-sites with
     function pointers.  As a result the interrupt remapping code is
     better abstraced from x86 core interrupt handling code.

   - Various smaller improvements, fixes and cleanups."

* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (26 commits)
  x86/intel/irq_remapping: Clean up x2apic opt-out security warning mess
  x86, kvm: Fix intialization warnings in kvm.c
  x86, irq: Move irq_remapped out of x86 core code
  x86, io_apic: Introduce eoi_ioapic_pin call-back
  x86, msi: Introduce x86_msi.compose_msi_msg call-back
  x86, irq: Introduce setup_remapped_irq()
  x86, irq: Move irq_remapped() check into free_remapped_irq
  x86, io-apic: Remove !irq_remapped() check from __target_IO_APIC_irq()
  x86, io-apic: Move CONFIG_IRQ_REMAP code out of x86 core
  x86, irq: Add data structure to keep AMD specific irq remapping information
  x86, irq: Move irq_remapping_enabled declaration to iommu code
  x86, io_apic: Remove irq_remapping_enabled check in setup_timer_IRQ0_pin
  x86, io_apic: Move irq_remapping_enabled checks out of check_timer()
  x86, io_apic: Convert setup_ioapic_entry to function pointer
  x86, io_apic: Introduce set_affinity function pointer
  x86, msi: Use IRQ remapping specific setup_msi_irqs routine
  x86, hpet: Introduce x86_msi_ops.setup_hpet_msi
  x86, io_apic: Introduce x86_io_apic_ops.print_entries for debugging
  x86, io_apic: Introduce x86_io_apic_ops.disable()
  x86, apic: Mask IO-APIC and PIC unconditionally on LAPIC resume
  ...

Pull timer changes from Ingo Molnar:
 "Main changes:

   - ntp: Add CONFIG_RTC_SYSTOHC: a generic RTC driver facility
     complementing the existing CONFIG_RTC_HCTOSYS, which uses NTP to
     keep the hardware clock updated.

   - posix-timers: Fix clock_adjtime to always return timex data on
     success.  This is changing the ABI, but no breakage was expected
     and found - caution is warranted nevertheless.

   - platform persistent clock improvements/cleanups.

   - clockevents: refactor timer broadcast handling to be more generic
     and less duplicated with matching architecture code (mostly ARM
     motivated.)

   - various fixes and cleanups"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timers/x86/hpet: Use HPET_COUNTER to specify the hpet counter in vread_hpet()
  posix-cpu-timers: Fix nanosleep task_struct leak
  clockevents: Fix generic broadcast for FEAT_C3STOP
  time, Fix setting of hardware clock in NTP code
  hrtimer: Prevent hrtimer_enqueue_reprogram race
  clockevents: Add generic timer broadcast function
  clockevents: Add generic timer broadcast receiver
  timekeeping: Switch HAS_PERSISTENT_CLOCK to ALWAYS_USE_PERSISTENT_CLOCK
  x86/time/rtc: Don't print extended CMOS year when reading RTC
  x86: Select HAS_PERSISTENT_CLOCK on x86
  timekeeping: Add CONFIG_HAS_PERSISTENT_CLOCK option
  rtc: Skip the suspend/resume handling if persistent clock exist
  timekeeping: Add persistent_clock_exist flag
  posix-timers: Fix clock_adjtime to always return timex data on success
  Round the calculated scale factor in set_cyc2ns_scale()
  NTP: Add a CONFIG_RTC_SYSTOHC configuration
  MAINTAINERS: Update John Stultz's email
  time: create __getnstimeofday for WARNless calls

Pull preparatory smp/hotplug patches from Ingo Molnar:
 "Some early preparatory changes for the WIP hotplug rework by Thomas
  Gleixner."

* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  stop_machine: Use smpboot threads
  stop_machine: Store task reference in a separate per cpu variable
  smpboot: Allow selfparking per cpu threads

Pull scheduler changes from Ingo Molnar:
 "Main changes:

   - scheduler side full-dynticks (user-space execution is undisturbed
     and receives no timer IRQs) preparation changes that convert the
     cputime accounting code to be full-dynticks ready, from Frederic
     Weisbecker.

   - Initial sched.h split-up changes, by Clark Williams

   - select_idle_sibling() performance improvement by Mike Galbraith:

        " 1 tbench pair (worst case) in a 10 core + SMT package:

          pre   15.22 MB/sec 1 procs
          post 252.01 MB/sec 1 procs "

  - sched_rr_get_interval() ABI fix/change.  We think this detail is not
    used by apps (so it's not an ABI in practice), but lets keep it
    under observation.

  - misc RT scheduling cleanups, optimizations"

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
  sched/rt: Add <linux/sched/rt.h> header to <linux/init_task.h>
  cputime: Remove irqsave from seqlock readers
  sched, powerpc: Fix sched.h split-up build failure
  cputime: Restore CPU_ACCOUNTING config defaults for PPC64
  sched/rt: Move rt specific bits into new header file
  sched/rt: Add a tuning knob to allow changing SCHED_RR timeslice
  sched: Move sched.h sysctl bits into separate header
  sched: Fix signedness bug in yield_to()
  sched: Fix select_idle_sibling() bouncing cow syndrome
  sched/rt: Further simplify pick_rt_task()
  sched/rt: Do not account zero delta_exec in update_curr_rt()
  cputime: Safely read cputime of full dynticks CPUs
  kvm: Prepare to add generic guest entry/exit callbacks
  cputime: Use accessors to read task cputime stats
  cputime: Allow dynamic switch between tick/virtual based cputime accounting
  cputime: Generic on-demand virtual cputime accounting
  cputime: Move default nsecs_to_cputime() to jiffies based cputime file
  cputime: Librarize per nsecs resolution cputime definitions
  cputime: Avoid multiplication overflow on utime scaling
  context_tracking: Export context state for generic vtime
  ...

Fix up conflict in kernel/context_tracking.c due to comment additions.

Pull perf changes from Ingo Molnar:
 "There are lots of improvements, the biggest changes are:

  Main kernel side changes:

   - Improve uprobes performance by adding 'pre-filtering' support, by
     Oleg Nesterov.

   - Make some POWER7 events available in sysfs, equivalent to what was
     done on x86, from Sukadev Bhattiprolu.

   - tracing updates by Steve Rostedt - mostly misc fixes and smaller
     improvements.

   - Use perf/event tracing to report PCI Express advanced errors, by
     Tony Luck.

   - Enable northbridge performance counters on AMD family 15h, by Jacob
     Shin.

   - This tracing commit:

        tracing: Remove the extra 4 bytes of padding in events

     changes the ABI.  All involved parties (PowerTop in particular)
     seem to agree that it's safe to do now with the introduction of
     libtraceevent, but the devil is in the details ...

  Main tooling side changes:

   - Add 'event group view', from Namyung Kim:

     To use it, 'perf record' should group events when recording.  And
     then perf report parses the saved group relation from file header
     and prints them together if --group option is provided.  You can
     use the 'perf evlist' command to see event group information:

        $ perf record -e '{ref-cycles,cycles}' noploop 1
        [ perf record: Woken up 2 times to write data ]
        [ perf record: Captured and wrote 0.385 MB perf.data (~16807 samples) ]

        $ perf evlist --group
        {ref-cycles,cycles}

     With this example, default perf report will show you each event
     separately.

     You can use --group option to enable event group view:

        $ perf report --group
        ...
        # group: {ref-cycles,cycles}
        # ========
        # Samples: 7K of event 'anon group { ref-cycles, cycles }'
        # Event count (approx.): 6876107743
        #
        #         Overhead  Command      Shared Object                      Symbol
        # ................  .......  .................  ..........................
            99.84%  99.76%  noploop  noploop            [.] main
             0.07%   0.00%  noploop  ld-2.15.so         [.] strcmp
             0.03%   0.00%  noploop  [kernel.kallsyms]  [k] timerqueue_del
             0.03%   0.03%  noploop  [kernel.kallsyms]  [k] sched_clock_cpu
             0.02%   0.00%  noploop  [kernel.kallsyms]  [k] account_user_time
             0.01%   0.00%  noploop  [kernel.kallsyms]  [k] __alloc_pages_nodemask
             0.00%   0.00%  noploop  [kernel.kallsyms]  [k] native_write_msr_safe
             0.00%   0.11%  noploop  [kernel.kallsyms]  [k] _raw_spin_lock
             0.00%   0.06%  noploop  [kernel.kallsyms]  [k] find_get_page
             0.00%   0.02%  noploop  [kernel.kallsyms]  [k] rcu_check_callbacks
             0.00%   0.02%  noploop  [kernel.kallsyms]  [k] __current_kernel_time

     As you can see the Overhead column now contains both of ref-cycles
     and cycles and header line shows group information also - 'anon
     group { ref-cycles, cycles }'.  The output is sorted by period of
     group leader first.

   - Initial GTK+ annotate browser, from Namhyung Kim.

   - Add option for runtime switching perf data file in perf report,
     just press 's' and a menu with the valid files found in the current
     directory will be presented, from Feng Tang.

   - Add support to display whole group data for raw columns, from Jiri
     Olsa.

   - Add per processor socket count aggregation in perf stat, from
     Stephane Eranian.

   - Add interval printing in 'perf stat', from Stephane Eranian.

   - 'perf test' improvements

   - Add support for wildcards in tracepoint system name, from Jiri
     Olsa.

   - Add anonymous huge page recognition, from Joshua Zhu.

   - perf build-id cache now can show DSOs present in a perf.data file
     that are not in the cache, to integrate with build-id servers being
     put in place by organizations such as Fedora.

   - perf top now shares more of the evsel config/creation routines with
     'record', paving the way for further integration like 'top'
     snapshots, etc.

   - perf top now supports DWARF callchains.

   - Fix mmap limitations on 32-bit, fix from David Miller.

   - 'perf bench numa mem' NUMA performance measurement suite

   - ... and lots of fixes, performance improvements, cleanups and other
     improvements I failed to list - see the shortlog and git log for
     details."

* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (270 commits)
  perf/x86/amd: Enable northbridge performance counters on AMD family 15h
  perf/hwbp: Fix cleanup in case of kzalloc failure
  perf tools: Fix build with bison 2.3 and older.
  perf tools: Limit unwind support to x86 archs
  perf annotate: Make it to be able to skip unannotatable symbols
  perf gtk/annotate: Fail early if it can't annotate
  perf gtk/annotate: Show source lines with gray color
  perf gtk/annotate: Support multiple event annotation
  perf ui/gtk: Implement basic GTK2 annotation browser
  perf annotate: Fix warning message on a missing vmlinux
  perf buildid-cache: Add --update option
  uprobes/perf: Avoid uprobe_apply() whenever possible
  uprobes/perf: Teach trace_uprobe/perf code to use UPROBE_HANDLER_REMOVE
  uprobes/perf: Teach trace_uprobe/perf code to pre-filter
  uprobes/perf: Teach trace_uprobe/perf code to track the active perf_event's
  uprobes: Introduce uprobe_apply()
  perf: Introduce hw_perf_event->tp_target and ->tp_list
  uprobes/perf: Always increment trace_uprobe->nhit
  uprobes/tracing: Kill uprobe_trace_consumer, embed uprobe_consumer into trace_uprobe
  uprobes/tracing: Introduce is_trace_uprobe_enabled()
  ...

Pull irq core changes from Ingo Molnar:
 "The biggest changes are the IRQ-work and printk changes from Frederic
  Weisbecker, which prepare the code for 'full dynticks' (the ability to
  stop or slow down the periodic tick arbitrarily, not just in idle time
  as today):

   - Don't stop tick with irq works pending.  This fix is generally
     useful and concerns archs that can't raise self IPIs.

   - Flush irq works before CPU offlining.

   - Introduce "lazy" irq works that can wait for the next tick to be
     executed, unless it's stopped.

   - Implement klogd wake up using irq work.  This removes the ad-hoc
     printk_tick()/printk_needs_cpu() hooks and make it working even in
     dynticks mode.

   - Cleanups and fixes."

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Export enable/disable_percpu_irq()
  arch Kconfig: Remove references to IRQ_PER_CPU
  irq_work: Remove return value from the irq_work_queue() function
  genirq: Avoid deadlock in spurious handling
  printk: Wake up klogd using irq_work
  irq_work: Make self-IPIs optable
  irq_work: Warn if there's still work on cpu_down
  irq_work: Flush work on CPU_DYING
  irq_work: Don't stop the tick with pending works
  nohz: Add API to check tick state
  irq_work: Remove CONFIG_HAVE_IRQ_WORK
  irq_work: Fix racy check on work pending flag
  irq_work: Fix racy IRQ_WORK_BUSY flag setting

Pull RCU changes from Ingo Molnar:
 "SRCU changes:

   - These include debugging aids, updates that move towards the goal of
     permitting srcu_read_lock() and srcu_read_unlock() to be used from
     idle and offline CPUs, and a few small fixes.

  Changes to rcutorture and to RCU documentation:

   - Posted to LKML at https://lkml.org/lkml/2013/1/26/188

  Enhancements to uniprocessor handling in tiny RCU:

   - Posted to LKML at https://lkml.org/lkml/2013/1/27/2

  Tag RCU callbacks with grace-period number to simplify callback
  advancement:

   - Posted to LKML at https://lkml.org/lkml/2013/1/26/203

  Miscellaneous fixes:

   - Posted to LKML at https://lkml.org/lkml/2013/1/26/204"

* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits)
  srcu: use ACCESS_ONCE() to access sp->completed in srcu_read_lock()
  srcu: Update synchronize_srcu_expedited()'s comments
  srcu: Update synchronize_srcu()'s comments
  srcu: Remove checks preventing idle CPUs from calling srcu_read_lock()
  srcu: Remove checks preventing offline CPUs from calling srcu_read_lock()
  srcu: Simple cleanup for cleanup_srcu_struct()
  srcu: Add might_sleep() annotation to synchronize_srcu()
  srcu: Simplify __srcu_read_unlock() via this_cpu_dec()
  rcu: Allow rcutorture to be built at low optimization levels
  rcu: Make rcutorture's shuffler task shuffle recently added tasks
  rcu: Allow TREE_PREEMPT_RCU on UP systems
  rcu: Provide RCU CPU stall warnings for tiny RCU
  context_tracking: Add comments on interface and internals
  rcu: Remove obsolete Kconfig option from comment
  rcu: Remove unused code originally used for context tracking
  rcu: Consolidate debugging Kconfig options
  rcu: Correct 'optimized' to 'optimize' in header comment
  rcu: Trace callback acceleration
  rcu: Tag callback lists with corresponding grace-period number
  rcutorture: Don't compare ptr with 0
  ...

commit d8e794df ("workqueue: set
delayed_work->timer function on initialization") exports function
delayed_work_timer_fn() only for GPL modules. This makes delayed-works
unusable for non-GPL modules, because initialization macro now requires
GPL symbol. For example schedule_delayed_work() available for non-GPL.
Signed-off-by: NKonstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org # 3.7

IA64 relied on it through sched.h inclusion:

  arch/ia64/kernel/init_task.c:38:11: error: 'MAX_PRIO' undeclared here (not in a function)
  arch/ia64/kernel/init_task.c:38:11: error: 'RR_TIMESLICE' undeclared here (not in a function)
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/n/tip-xaan1twswggedMR0airtpjui@git.kernel.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>

The reader side code has no requirement to disable interrupts while
sampling data. The sequence counter is enough to ensure consistency.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: NIngo Molnar <mingo@kernel.org>

These functions are used by the tilegx onchip network driver, and it's
useful to be able to load that driver as a module.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
Link: http://lkml.kernel.org/r/201302012043.r11KhNZF024371@farm-0021.internal.tilera.comSigned-off-by: NThomas Gleixner <tglx@linutronix.de>

Pull input subsystem fixes from Dmitry Torokhov:
 "Two small driver fixups and a documentation update for managed input
  devices"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: wacom - fix wacom_set_report retry logic
  Input: document that unregistering managed devices is not necessary
  Input: lm8323 - fix checking PWM interrupt status

Commit c060f943 ("mm: use aligned zone start for pfn_to_bitidx
calculation") fixed out calculation of the index into the pageblock
bitmap when a !SPARSEMEM zome was not aligned to pageblock_nr_pages.

However, the _allocation_ of that bitmap had never taken this alignment
requirement into accout, so depending on the exact size and alignment of
the zone, the use of that index could then access past the allocation,
resulting in some very subtle memory corruption.

This was reported (and bisected) by Ingo Molnar: one of his random
config builds would hang with certain very specific kernel command line
options.

In the meantime, commit c060f943 has been marked for stable, so this
fix needs to be back-ported to the stable kernels that backported the
commit to use the right alignment.
Bisected-and-tested-by: NIngo Molnar <mingo@kernel.org>
Acked-by: NMel Gorman <mgorman@suse.de>
Cc: stable@kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

By just reversing the order memtest is using the test patterns,
an additional round to zero the memory is not necessary.

This might save up to a second or even more for setups which are
doing tests on every boot.
Signed-off-by: NAlexander Holler <holler@ahsoftware.de>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1361029097-8308-1-git-send-email-holler@ahsoftware.deSigned-off-by: NIngo Molnar <mingo@kernel.org>

On AMD family 15h processors, there are 4 new performance
counters (in addition to 6 core performance counters) that can
be used for counting northbridge events (i.e. DRAM accesses).

Their bit fields are almost identical to the core performance
counters. However, unlike the core performance counters, these
MSRs are shared between multiple cores (that share the same
northbridge).

We will reuse the same code path as existing family 10h
northbridge event constraints handler logic to enforce
this sharing.
Signed-off-by: NJacob Shin <jacob.shin@amd.com>
Acked-by: NStephane Eranian <eranian@google.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Jacob Shin <jacob.shin@amd.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1360171589-6381-7-git-send-email-jacob.shin@amd.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

Merge tag 'stable/for-linus-3.8-rc7-tag-two' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

Pull xen fixes from Konrad Rzeszutek Wilk:
 "Two fixes:

   - A simple bug-fix for redundant NULL check.

   - CVE-2013-0228/XSA-42: x86/xen: don't assume %ds is usable in
     xen_iret for 32-bit PVOPS

  and two reverts:

   - Revert the PVonHVM kexec.  The patch introduces a regression with
     older hypervisor stacks, such as Xen 4.1."

* tag 'stable/for-linus-3.8-rc7-tag-two' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  Revert "xen PVonHVM: use E820_Reserved area for shared_info"
  Revert "xen/PVonHVM: fix compile warning in init_hvm_pv_info"
  xen: remove redundant NULL check before unregister_and_remove_pcpu().
  x86/xen: don't assume %ds is usable in xen_iret for 32-bit PVOPS.

As reported by Klaus Schmidinger:
 "In VDR I use an ioctl() call with FE_READ_UNCORRECTED_BLOCKS on a
  device (using stb0899).  After this call I check 'errno' for
  EOPNOTSUPP to determine whether this device supports this call.  This
  used to work just fine, until a few months ago I noticed that my
  devices using stb0899 didn't display their signal quality in VDR's OSD
  any more.  After further investigation I found that
  ioctl(FE_READ_UNCORRECTED_BLOCKS) no longer returns EOPNOTSUPP, but
  rather ENOTTY.  And since I stop getting the signal quality in case
  any unknown errno value appears, this broke my signal quality query
  function."

While the changes reflect what is there at:

  http://comments.gmane.org/gmane.linux.kernel/1235728

it does cause regression on userspace.  So, revert it to stop the
damage.

This reverts commit 177ffe50 ("[media] dvb_frontend: return -ENOTTY
for unimplement IOCTL").
Reported-by: NKlaus Schmidinger <Klaus.Schmidinger@tvdr.de>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Pull sparc fixes from David Miller:
 "A couple small fixes for sparc including some THP brown-paper-bag
  material:

   1) During the merging of all the THP support for various
      architectures, sparc missed adding a
      HAVE_ARCH_TRANSPARENT_HUGEPAGE to it's Kconfig, oops.

   2) Sparc needs to be mindful of hugepages in get_user_pages_fast().

   3) Fix memory leak in SBUS probe, from Cong Ding.

   4) The sunvdc virtual disk client driver has a test of the bitmask of
      vdisk server supported operations which was off by one bit"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sunvdc: Fix off-by-one in generic_request().
  sparc64: Fix get_user_pages_fast() wrt. THP.
  sparc64: Add missing HAVE_ARCH_TRANSPARENT_HUGEPAGE.
  sparc: kernel/sbus.c: fix memory leakage

Pull one more x86 fix from Peter Anvin:
 "Sigh.  One more patch in the "please don't brick my Samsung" series"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi: Clear EFI_RUNTIME_SERVICES rather than EFI_BOOT by "noefi" boot parameter