Re: [PATCH] Document Linux's memory barriers [try #5]

From: Linus Torvalds
Date: Thu Mar 16 2006 - 18:53:10 EST

On Thu, 16 Mar 2006, Paul E. McKenney wrote:
> Also, I have some verbiage and diagrams of Alpha's operation at
> Feel free to take any that helps. (Source for paper is Latex and xfig,
> for whatever that is worth.)

This paper too claims that x86-64 has somehow different memory ordering
constraints than regular x86. Do you actually have a source for that
statement, or is it just a continuation of what looks like confusion in
the Linux x86-64 header files?

(Also, x86 doesn't have an incoherent instruction cache - some older x86
cores have an incoherent instruction decode _buffer_, but that's a
slightly different issue with basically no effect on any sane program).

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