Per cpu thread hotplug infrastructure

The following series implements the infrastructure for parking and
unparking kernel threads to avoid the full teardown and fork on cpu
hotplug operations along with management infrastructure for hotplug
and users.

Changes since V1:

 - Addressed the review comments
 - Fixed a missing state update in parkme (reported by Paul)
 - Simplified rcu_yield()
 - Added Pauls RCU conversion

Full diffstat below. Due to the RCU cleanup we now remove more code
than we add. :)

Thanks,

	tglx
---
 drivers/infiniband/hw/ehca/ehca_irq.c |  240 ++++++++-------------
 drivers/infiniband/hw/ehca/ehca_irq.h |    5 
 include/linux/kthread.h               |   11 
 include/linux/smpboot.h               |   40 +++
 kernel/cpu.c                          |   10 
 kernel/kthread.c                      |  184 ++++++++++++++--
 kernel/rcutree.c                      |   12 -
 kernel/rcutree.h                      |   15 -
 kernel/rcutree_plugin.h               |  375 +++++-----------------------------
 kernel/rcutree_trace.c                |    3 
 kernel/smpboot.c                      |  206 ++++++++++++++++++
 kernel/smpboot.h                      |    4 
 kernel/softirq.c                      |   84 +------
 kernel/watchdog.c                     |  232 ++++++---------------
 14 files changed, 678 insertions(+), 743 deletions(-)

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