Re: [PATCH] Document Linux's memory barriers
From: David Howells
Date: Wed Mar 08 2006 - 07:32:11 EST
Linus Torvalds <torvalds@xxxxxxxx> wrote:
> > Linus explained recently that wmb() on x86 does not order stores to
> > system memory w.r.t. stores to stores to prefetchable I/O memory (at
> > least that's what I think he said ;).
On i386 and x86_64, do IN and OUT instructions imply MFENCE? It's not obvious
from the x86_64 docs.
David
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