[RFC PATCH V4 0/5] cpuidle: Cleanup pm_idle and include driver/cpuidle.c in-kernel

[Trinabh Gupta <trinabh@linux.vnet.ibm.com>]

Changes in V4:
* Implemented cpuidle driver for xen. Earlier pm_idle
  function pointer would be set to default idle. Now a cpuidle_driver
  encapsulating the idle routine is cleanly registered for this 
  using cpuidle_register_driver API.

* Implemented a cpuidle driver for apm_cpu_idle() as part of
  APM BIOS driver. Earlier APM BIOS driver would flip 
  pm_idle function pointer to apm_cpu_idle.

* This patch series applies on 2.6.38, and was tested on x86 system 
  with multiple sleep states.

Goal:
This patch series tries to achieve the goal of having cpuidle manage
all idle routine for x86. It removes pm_idle function pointer which
causes problems discussed at http://lkml.org/lkml/2009/8/28/43 and
http://lkml.org/lkml/2009/8/28/50.

V1 of this series is at https://lkml.org/lkml/2010/10/19/449,
V2 is at https://lkml.org/lkml/2011/1/13/98 and 
V3 is at https://lkml.org/lkml/2011/2/8/73

---

Trinabh Gupta (5):
      cpuidle: cpuidle driver for apm
      cpuidle: driver for xen
      cpuidle: default idle driver for x86
      cpuidle: list based cpuidle driver registration and selection
      cpuidle: Remove pm_idle pointer for x86


 arch/x86/Kconfig              |    2
 arch/x86/kernel/apm_32.c      |   75 ++++++-
 arch/x86/kernel/process.c     |  339 --------------------------------
 arch/x86/kernel/process_32.c  |    4
 arch/x86/kernel/process_64.c  |    4
 arch/x86/xen/setup.c          |   42 ++++
 drivers/acpi/processor_idle.c |    2
 drivers/cpuidle/Kconfig       |    9 +
 drivers/cpuidle/cpuidle.c     |   50 ++++-
 drivers/cpuidle/driver.c      |  114 ++++++++++-
 drivers/idle/Makefile         |    1
 drivers/idle/default_driver.c |  437 +++++++++++++++++++++++++++++++++++++++++
 include/linux/cpuidle.h       |    3
 13 files changed, 707 insertions(+), 375 deletions(-)
 create mode 100644 drivers/idle/default_driver.c

--
-Trinabh