Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80on some AMD64x2 laptops, etc.

[H. Peter Anvin]

Pavel Machek wrote:
> Hi!
>
> > The process of safely making delicate changes here is beyond my 
> > responsibility as just a user - believe me, I'm not suggesting that a risky 
> > fix be put in .24.   I can patch my own kernels, and I can even share an 
> > unofficial patch with others for now, or suggest that Fedora and Ubuntu add 
> > it to their downstream.
> >
> > May I make a small suggestion, though.   If the decision is a DMI-keyed 
> > switch from out-80 to udelay(2)  gets put in, perhaps there should also be 
> > a way for people to test their own configuration for the underlying problem 
> > made available as a script.   Though it is a "hack", all you need to freeze 
> > a problem system is to run a loop doing about 1000 "cat /dev/nvram > 
> > /dev/null"  commands.  If that leads to a freeze, one might ask to have the 
> > motherboard added to the DMI-key list.
>
> Can you freeze it by catting /dev/rtc, too? That may be significant,
> because that is readable for group audio (at least on some
> systems)... which would smell like "small security hole" to me.
> 									Pavel

Heck, on my system (Fedora 7), it's mode 644...

	-hpa
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