Re: [PATCH 01/16] math128: Introduce various 128bit primitives

[Peter Zijlstra]

On Fri, 2012-10-26 at 12:44 +0200, Peter Zijlstra wrote:
> > We can still have the user space interface handing in the information
> > in nsec resolution, but it's reasonable to scale it down to something
> > useful. Just shift the incoming information right by 10, so you're in
> > the 1us resolution for all the internal math and all your limitation
> > problems are gone. A shift by ten for converting back and forth to
> > nsecs is not a real performance issue.
> 
> I'm fine with that.. all I wanted was to not have the undefined overflow
> we initially had. 

Note that we still need the constraint checking with this, although with
both values shifted right 10 bits the range is now much bigger and
shouldn't be a practical limit anymore.
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