[GIT PULL V2] Changes for 4.8

[Juergen Gross]

Hi Linus,

please consider pulling a patch series for 4.8 from:

  https://github.com/jgross1/linux.git tags/for-linus-4-8

Support calling functions on dedicated physical cpu

Some hardware (e.g. Dell Studio laptops) require special functions to
be called on physical cpu 0 in order to avoid occasional hangs. When
running as dom0 under Xen this could be achieved only via special boot
parameters (vcpu pinning) limiting the hypervisor in it's scheduling
decisions.

This patch series is adding a generic function to be able to temporarily
pin a (virtual) cpu to a dedicated physical cpu for executing above
mentioned functions on that specific cpu. The drivers (dcdbas and i8k)
requiring this functionality are modified accordingly.

Unfortunately 2 of the 6 patches got no Acks as the maintainers didn't
react in spite of multiple pings and resends. The core modification in
the scheduler got an Ack from Peter and multiple tests showed no
regressions.

As the series is touching multiple subsystems I couldn't find anyone
willing to take the series via his tree (I tried Ingo, Thomas, Peter).

Juergen Gross (6):
      xen: sync xen header
      virt, sched: add generic vcpu pinning support
      smp: add function to execute a function synchronously on a cpu
      xen: add xen_pin_vcpu() to support calling functions on a
dedicated pcpu
      dcdbas: make use of smp_call_on_cpu()
      hwmon: use smp_call_on_cpu() for dell-smm i8k

 MAINTAINERS                       |   1 +
 arch/x86/include/asm/hypervisor.h |   4 ++
 arch/x86/kernel/cpu/hypervisor.c  |  11 +++++
 arch/x86/xen/enlighten.c          |  40 +++++++++++++++
 drivers/firmware/dcdbas.c         |  51 +++++++++----------
 drivers/hwmon/dell-smm-hwmon.c    |  36 ++++++++------
 include/linux/hypervisor.h        |  17 +++++++
 include/linux/smp.h               |   3 ++
 include/xen/interface/sched.h     | 100
+++++++++++++++++++++++++++++++-------
 kernel/smp.c                      |  51 +++++++++++++++++++
 kernel/up.c                       |  18 +++++++
 11 files changed, 273 insertions(+), 59 deletions(-)
 create mode 100644 include/linux/hypervisor.h

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