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

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Message-ID: <4CBE1781.1050000@zytor.com>
Date:	Tue, 19 Oct 2010 15:11:13 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Daniel Drake <dsd@...top.org>
CC:	tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
	dilinger@...ued.net, 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

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.)

	-hpa
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