Messages in this thread | | | Date | Fri, 2 Aug 2002 08:46:38 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: adjust prefetch in free_one_pgd() |
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On Fri, 2 Aug 2002, David Mosberger wrote: > > I thought the prefetches API intended this to be a safe operation?
Well, any _sane_ prefetch API would be safe.
However, there is known-broken hardware out there, in which a prefetch from IO space will kill the machine.
Personally, I would just say that we should disable prefetch on such clearly broken hardware, but since it's Alans favourite machine (some early AMD Athlon if I remember correctly), I think Alan will disagree ;)
> It's definitely not an issue on ia64: there, prefetches against > uncached memory translations are automatically canceled.
That's true of just about any other architecture too. I think the AMD case is an erratum, so even on AMD it is _supposed_ to work.
Linus
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