linux-kernel - Re: [RFC] [PATCH 10/16] x86

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Message-Id: <200611150449.26057.ak@suse.de>
Date:	Wed, 15 Nov 2006 04:49:25 +0100
From:	Andi Kleen <ak@...e.de>
To:	Pavel Machek <pavel@....cz>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vivek Goyal <vgoyal@...ibm.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Reloc Kernel List <fastboot@...ts.osdl.org>, akpm@...l.org,
	hpa@...or.com, magnus.damm@...il.com, lwang@...hat.com,
	dzickus@...hat.com
Subject: Re: [RFC] [PATCH 10/16] x86_64: 64bit PIC ACPI wakeup

On Wednesday 15 November 2006 00:43, Pavel Machek wrote:
> Hi!
> 
> > >> 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...

Hmm? That's an improvement in my book. Of course i would prefer
truly shared code, but even more similar code is better.

> > > 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.

He was just nitpicking. Eric is right it is just an optimization
(modulo hardware/software bugs) 

-Andi
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