linux-kernel - Re: [PATCH 6 of 7] x86: use early_ioremap in __acpi_map

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Date:	Sun, 07 Sep 2008 17:03:23 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Xen Devel <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH 6 of 7] x86: use early_ioremap in __acpi_map_table

Andi Kleen wrote:
> On Sun, Sep 07, 2008 at 03:21:18PM -0700, Jeremy Fitzhardinge wrote:
>   
>> __acpi_map_table() effectively reimplements early_ioremap().  Rather
>> than have that duplication, just implement it in terms of
>> early_ioremap().
>>
>> However, unlike early_ioremap(), __acpi_map_table() just maintains a
>> single mapping which gets replaced each call, and has no corresponding
>> unmap function.  Implement this by just removing the previous mapping
>> each time its called.  Unfortunately, this will leave a stray mapping
>> at the end.
>>     
>
> It would be better to just fix the ACPI code to unmap.

I was concerned that would cause lots of cross-arch churn, but of course
the only other relevant architecture is ia64.  I'll prep a followup patch.

    J
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