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Date:	Wed, 15 Nov 2006 00:43:34 +0100
From:	Pavel Machek <>
To:	"Eric W. Biederman" <>
Cc:	Vivek Goyal <>,
	linux kernel mailing list <>,
	Reloc Kernel List <>,,,,,,
Subject: Re: [RFC] [PATCH 10/16] x86_64: 64bit PIC ACPI wakeup


> >> I don't have a configuration I can test this but it compiles cleanly
> >
> > Ugh, now that's a big patch.. and untested, too :-(.
> It was very carefully code reviewed at least the first time,
> and the code was put in sync with code that was tested.

So we had two very different versions of "switch to 64-bit" and now we
have two mostly similar versions. Not a big improvement...

> > Why is PGE no longer required, for example?
> PGE is never required.  Especially on a temporary page table.
> PGE is an optimization, to make context switches faster.

HPA tells me it is.

> > Can we get it piece-by-piece?


> >> Vivek has tested this patch for suspend to memory and it works fine.
> >
> > Ok, so it was tested on one config. Given that the patch deals with
> > detecting CPU oddities... :-(
> Read the code.  Given your scorn and the state of that mess when I
> started I'm not certain a productive conversation can be had.
> Do you understand the code as it is currently written?

Mostly. I've written it at some point.

It may be a mess, but patch below is wholesale rewrite, mixing
cleanups (ebx->rbx) with serious changes (PGE). And then you tell me
it was tested on one machine. It is hard/impossible to rewrite, and
changelog is not helpful, either.

Please split it up.
(cesky, pictures)
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