[RFC][PATCH 0/8] sched,idle: need resched polling rework

[Peter Zijlstra]

A while ago both Mike and Andy complained that we still get pointless wakeup
IPIs, we had a few patches back and forth but eventually more or less agreed
and then nothing... :-)

So here's a number of patches that implement something near what we left off
with.

Its only been compile/boot tested on x86_64, I've no actually looked at the IPI
numbers yet.

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