Re: linux-next: add utrace tree

[H. Peter Anvin]

On 02/07/2010 10:54 PM, Pavel Machek 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.

	-hpa
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