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

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Date:	Fri, 18 Jan 2008 17:10:57 +0100
From:	"Andreas Herrmann3" <andreas.herrmann3@....com>
To:	"Venki Pallipadi" <venkatesh.pallipadi@...el.com>
cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Siddha, Suresh B" <suresh.b.siddha@...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

On Thu, Jan 17, 2008 at 03:04:10PM -0800, Venki Pallipadi wrote:
>
> Below is another potential fix for the problem here. Going through ACPI
> ioremap usages, we found at one place the mapping is cached for possible
> optimization reason and not unmapped later. Patch below always unmaps
> ioremap at this place in ACPICA.

The patch does not fix the problem. The conflicting cache attributes are
still there.

I have done another test after I have added a debug message in iounmap
when a direct mapping gets removed. (See boot-exregion-2.log)
For the address in question this gives:

# grep c04 boot-exregion-2.log

ioremap: addr c0403104, size fc
ioremap: addr c0403184, size 7c
ioremap: addr c040310a, size f6
ioremap: addr c040310a, size f6
ioremap: addr c040310a, size f6
ioremap: addr c040310a, size f6
ioremap: addr c040318a, size 76
ioremap: addr c0403104, size fc
ioremap: addr c0403104, size fc
ioremap: addr c0403184, size 7c
ioremap: addr c0403104, size fc
ioremap: addr c0403184, size 7c
ioremap_nocache: addr c0400000, size 1000
iounmap: addr c0400000, size 1000
ioremap_nocache: addr c0401000, size 1000
iounmap: addr c0401000, size 1000
ioremap_nocache: addr c0402000, size 1000
iounmap: addr c0402000, size 1000
ioremap: addr c0403104, size fc
ioremap: addr c0403184, size 7c
ioremap_nocache: addr c0403000, size 200
swapper:1 conflicting cache attribute c0403000-c0404000 uncached<->default
    ...


Regards,

Andreas

View attachment "boot-exregion-2.log" of type "text/plain" (24712 bytes)