cpu_stop: implement and use cpu_stop

Hello, all.

cpu_hog has been renamed to cpu_stop and moved into
kernel/stop_machine.c per Peter Zijlstra's suggestion.  This patchset
is feature-wise identical to the second take of cpuhog[L].  The only
changes are the rename, relocation and refresh against the current
sched/core.

The following API renames took place.

- hog_one_cpu()		-> stop_one_cpu()
- hog_one_cpu_nowait()	-> stop_one_cpu_nowait()
- hog_cpus()		-> stop_cpus()
- try_hog_cpus()	-> try_stop_cpus()
- *_hog() callbacks	-> *_cpu_stop()

Internal names have been renamed accordingly.  e.g. cpuhog thread
became cpu_stopper thread and so on.

This patchset contains the following four patches.

 0001-cpu_stop-implement-stop_cpu-s.patch
 0002-stop_machine-reimplement-using-cpu_stop.patch
 0003-scheduler-replace-migration_thread-with-cpu_stop.patch
 0004-scheduler-kill-paranoia-check-in-synchronize_sched_e.patch

The patches are against the current linux-2.6-tip/sched/core
(09a40af5240de02d848247ab82440ad75b31ab11) and are available in the
following git tree.

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git cpu_stop

I retained the original acked/reviewed-by's as the changes are mostly
cosmetic.  If you disagree, please let me know.  I'll try to push this
through sched/core again once Peter acks.

diffstat follows.

 Documentation/RCU/torture.txt |   10 
 arch/s390/kernel/time.c       |    1 
 drivers/xen/manage.c          |   14 -
 include/linux/rcutiny.h       |    2 
 include/linux/rcutree.h       |    1 
 include/linux/stop_machine.h  |   59 ++--
 kernel/cpu.c                  |    8 
 kernel/module.c               |   14 -
 kernel/rcutorture.c           |    2 
 kernel/sched.c                |  271 +++------------------
 kernel/sched_fair.c           |   42 ++-
 kernel/stop_machine.c         |  525 ++++++++++++++++++++++++++++++++----------
 12 files changed, 514 insertions(+), 435 deletions(-)

Thanks.

--
tejun

[L] http://thread.gmane.org/gmane.linux.kernel/962635
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