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[Mathew Hodson <mathew.hodson@xxxxxxxxx>]

** CVE removed: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2010-4249

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https://bugs.launchpad.net/bugs/684888

Title:
  Update intel_idle driver

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Maverick:
  Fix Released

Bug description:
  SRU Justification:

  We periodically provide updated drivers to provide additional support
  for hardware and provide bug fixes. The intel_idle is a cpuidle driver
  that loads on specific Intel processors in lieu of the legacy ACPI
  processor_idle driver. The intent is to make Linux more efficient on
  these processors, as intel_idle knows more than ACPI, as well as make
  Linux more immune to ACPI BIOS bugs. As we now support HW that can
  leverage the intel_idle driver, it's advantageous to provide an
  updated version of the driver for those interested in it's use. All of
  the patches are already upstream as well (see details below).

  I'd originally pursued providing this update via linux-bcakports-
  modules.  However, testing proved that because the acpi_idle driver is
  built into the kernel, it prevents the intel_idle driver from loading
  later on via LBM. This is because the core cpuidle driver is not
  capable of handling run-time changing of idle drivers.

  I would also like to note that these patches were originally submitted to upstream stable by the upstream maintainer.  However, the submission
  was later retracted due to the fact that some of the patches are cosmetic in nature.  See:

  git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-
  idle-2.6.35.y.git idle-release

  Impact:

  These patches should only affect the intel_idle driver.  It will also
  only load on supported systems.  This driver can also be disabled by
  booting with "intel_idle.max_cstate=0" which disables intel_idle and
  the system will fall back on ACPI's "acpi_idle".

  I will also update
  https://wiki.ubuntu.com/Kernel/Dev/KernelDriverDeviations to note the
  update.

  Test Case:

  Load the kernel with the updated intel_idle driver on a system which
  is supported and confirm it loads/functions.

  A summary of the usptream patches is as follows:

   * intel_idle: do not use the LAPIC timer for ATOM C2
   * intel_idle: add initial Sandy Bridge support
   * intel_idle: delete bogus data from cpuidle_state.power_usage
   * intel_idle: simplify test for leave_mm()
   * intel_idle: enable Atom C6
   * intel_idle: Voluntary leave_mm before entering deeper
   * cpuidle: extend cpuidle and menu governor to handle dynamic states
   * intel_idle: add missing __percpu markup
   * intel_idle: Change mode 755 => 644
   * x86, mwait: Move mwait constants to a common header file
   * intel_idle: recognize Lincroft Atom Processor
   * intel_idle: add support for Westmere-EX
   * intel_idle: delete power_policy modparam, and choose substate functions
   * intel_idle: delete substates DEBUG modparam

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