On 06/02/2014 10:25 AM, Waiman Long wrote:
>
> Doing an xchg is a very expensive operation compared with ACCESS_ONCE. I
> will not suggest doing that to make it right for PA-RISC at the expense
> of performance in other architectures.
>
And of course, this gets into the toxic question: what are reasonable
minimum requirements for Linux? How far do we need to stretch to
support niche architectures which have very small (Linux) userbases?
-hpa
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