Re: linux-next: add utrace tree

Arjan van de Ven
2010-02-08T09:53:42Z

On Mon, 8 Feb 2010 07:54:25 +0100
Pavel Machek <pavel@ucw.cz> wrote:

> > No, it has nothing to do with ring. It has to do with modifying
> > code that another CPU could be executing at the same time, and with
> > modifying code on the same processor through another virtual alias
> > (they are different issues.) The same issues apply regardless of
> > the CPL of the processor.
>
> ...but these are always 'there could be cpu bugs around' issues,
> right? Like amd k6. AFAICT x86 always supported self-modifying code
> without any extra barriers needed...

self modifying code yes, cross modifying code no.

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Arjan van de Ven Intel Open Source Technology Centre
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