[PATCH V11 03/17] riscv: Use Zicbop in arch_xchg when available

[Conor Dooley]

> > If this isn't being used in a similar manner, then the w has no reason
> > to be in the odd lowercase form.
> 
> Other than to be consistent... However, the CBO_* instructions are not
> consistent with the rest of macros. If we don't need lowercase for any
> reason, then my preference would be to bite the bullet and change all the
> callsites of CBO_* macros and then introduce this new instruction as
> PREFETCH_W

Aye, I probably should've done it to begin with. Maybe there was some
other consideration at the time.
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