Re: [PATCH v2] introduce atomic_pointer to fix a race condition in cancelable mcs spinlocks

[H. Peter Anvin]

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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