add this_cpu_{add_return|[cmp]xchg}() operations

Hello,

Here are the patches that I applied to percpu#this_cpu_ops branch.
This branch won't be rebased and contains only the commits which
implement the new this_cpu_* ops, so that it can be pulled into other
trees without patches which make use of the operations which modify
other subsystems.

Christoph, I rearranged things a bit to make it conform better to the
overall organization.  It would be great if you can go over it once
just in case.

There are two git branches.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git this_cpu_ops
 git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-2.6.38

Both branches won't be rebased.  this_cpu_ops contains only patches
from this series.  for-2.6.38 contains other percpu changes mostly
composed of patches which apply this_cpu_*() ops.

Thank you.

--
tejun
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