linux-kernel - Re: [patch 0/4] x86: PAT followup - Incremental changes and bug fixes

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Date:	Wed, 16 Jan 2008 21:24:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andreas Herrmann <andreas.herrmann3@....com>
Cc:	venkatesh.pallipadi@...el.com, ak@....de, ebiederm@...ssion.com,
	rdreier@...co.com, torvalds@...ux-foundation.org, gregkh@...e.de,
	airlied@...net.ie, davej@...hat.com, tglx@...utronix.de,
	hpa@...or.com, akpm@...ux-foundation.org, arjan@...radead.org,
	jesse.barnes@...el.com, davem@...emloft.net,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 0/4] x86: PAT followup - Incremental changes and bug
	fixes


* Andreas Herrmann <andreas.herrmann3@....com> wrote:

> I just want to report that the PAT support in x86/mm causes crashes on 
> two of my test machines. On both boxes the SATA detection does not 
> work when the PAT support is patched into the kernel.
> 
> Symptoms are as follows -- best described by a diff between the two 
> boot.logs:
> 
> # diff boot-failing.log boot-working.log
> 
> -Linux version 2.6.24-rc8-ga9f7faa5 (root@...ter) (gcc version ...
> +Linux version 2.6.24-rc8-g2ea3cf43 (root@...ter) (gcc version ...
> ...
>  early_iounmap(ffffffff82a0b000, 00001000)
> -early_ioremap(000000000000c000, 00001000) => -000002103394304
> -early_iounmap(ffffffff82a0c000, 00001000)

hm, so the early_ioremap() stuff isnt working well enough ...

that's the main effect of the PAT patches at the moment: no kernel code 
will access the low linear mappings (BIOS tables, ACPI data, etc.) 
directly, it's all done via early_ioremap(). But it's apparently buggy 
somewhere ...

	Ingo
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