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Subject[PATCH][2.5][0/18] smp_call_function_on_cpu + removal of nonatomic/retry
The following patches introduce smp_call_function_on_cpu which
provides a facility for sending IPIs to a group or single cpu encapsulated
within a bitmask. At present there are a number of arch specific functions
which achieve the same effect, the name was lifted from Alpha.

As per Manfred's request i have also taken the liberty of removing the
nonatomic/retry parameter from smp_call_function since it's used
as 'nonatomic' on a number of architectures and used as 'retry' on others
whilst not actually doing much on a majority of said architectures.

I have not being able to compile or test the other architectures apart
from i386 (surprise, surprise), but there should only be minimal, if any,
syntax errors.

Please consider for inclusion, if a particular arch maintainer notes
breakage in my implementation please point it out and i'll do the grunt


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