Re: [RFC GIT PULL] nohz: Full dynticks rq clock handling

[Peter Zijlstra]

Another thing I just noticed; our update_curr() assumes its called at
least once every 4 odd seconds (2^32 ns like).

update_curr() is 'required' for things like task runtime stats and
everything that hangs off of that like cputimers etc.

Now I'm not entirely sure how the nr_running==1 nohz case deals with
this, but I can imagine it might take a while. In this case we might
need to 'fix' update_curr() to not asume the time delta fits in 32
bits.

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