linux-kernel - Re: [PATCH] OLPC: Add XO-1 suspend/resume support

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Date:	Wed, 20 Oct 2010 07:47:52 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Daniel Drake <dsd@...top.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"dilinger@...ued.net" <dilinger@...ued.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...64.org>,
	"Roedel, Joerg" <Joerg.Roedel@....com>
Subject: Re: [PATCH] OLPC: Add XO-1 suspend/resume support

From: "H. Peter Anvin" <hpa@...or.com>
Date: Tue, Oct 19, 2010 at 06:11:13PM -0400

> On 10/19/2010 03:01 PM, Daniel Drake wrote:
> > Add code needed for basic suspend/resume of the XO-1 laptop.
> > 
> > swsusp_pg_dir needs to be exposed as it is used by the assembly
> > code run in the wakeup path.
> > 
> 
> Okay... this is Yet Another Reason why we need to unify all the bloody
> trampoline page tables.
> 
> What it comes down to is that there are several users which need a 1:1
> mapped pagetable and a chunk of memory < 1 MiB, and they should all be
> combined and linked together, and share a single pagetable set that
> sticks around.
> 
> Borislav has already been doing some of this work:
> 
> [PATCH] x86-32, mm: Add an initial page table for core bootstrapping
> 
> I thought that patch was already in -tip, but it looks like it's not...
> Borislav/Joerg... was there a newer patch or did we just miss the final
> version?  I remember we talked about this at some length, but it looks
> like I dropped the ball (I was on vacation when the above message was
> posted.)

The final version with fixed ACPI sleep is this one:
http://www.gossamer-threads.com/lists/linux/kernel/1270589

I ran it for a couple of weeks and it didn't show any regressions. If
you want to get it into the merge window, I can get you an updated
version against a -tip branch of your liking ASAP.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Gemeinde Aschheim, Landkreis Muenchen
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