Re: [patch 02/11] PAT x86: Map only usable memory in x86_64 identity map and kernel text

[Jesse Barnes]

On Friday, January 18, 2008 10:12 am Andi Kleen wrote:
> I looked back then when I had bisected it down and I admit I didn't spot
> the problem from source review. I think it came from the reordering so
> blacklisting AMD alone wouldn't have helped. Might have been some
> subtle race (e.g. long ago we had such races in the MTRR code
> triggered by the first HT CPUs)
>
> Anyways I just test booted latest git-x86 with your patches included on
> the QC system and it booted now. However it has both more RAM and newer
> CPUs (the original ones were pre-production, that is why I also didn't send
> you logs[1] ..) then when I tested originally. So this means either the
> problem was somewhere else or the different configuration hides it.
>
> I guess you will hear about it if it's still broken on other machines.
>
> Currently it looks good.
>
> I think it should be enabled on AMD too though. If the reordering breaks
> it then blacklisting won't help anyways.
>
> -Andi
>
> [1] but I checked the known errata and there was nothing related to MTRR.

Ah, ok, that explains your reticence earlier.  Thanks for testing again, I 
guess the patch is good to go.

Jesse
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