cleanup the RAID6 P/Q library v3

[Christoph Hellwig]

On Mon, Jun 29, 2026 at 05:34:41AM -0700, H. Peter Anvin wrote:
> The real issue though is that the benchmarking isn't really helpful, either. 
> 
> It has to do with power across the whole chip, so it perversely enough depends on what *else* is going on...

Yes.  And preferences might matter if this is just a file server or
something running a real workload as well.  But I don't really have a
good answer to that.