linux-kernel - RE: [PATCH -mm 0/3] i386 boot: replace boot_ioremap with enhancedbt

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Date:	Tue, 15 Jan 2008 18:51:25 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Huang, Ying" <ying.huang@...el.com>, "Ingo Molnar" <mingo@...e.hu>
Cc:	<akpm@...ux-foundation.org>, "H. Peter Anvin" <hpa@...or.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...hat.com>, "Andi Kleen" <ak@...e.de>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH -mm 0/3] i386 boot: replace boot_ioremap with enhancedbt_ioremap

 

>-----Original Message-----
>From: Huang, Ying 
>Sent: Tuesday, January 15, 2008 1:49 AM
>To: Ingo Molnar; Pallipadi, Venkatesh
>Cc: akpm@...ux-foundation.org; H. Peter Anvin; Thomas 
>Gleixner; Ingo Molnar; Andi Kleen; linux-kernel@...r.kernel.org
>Subject: Re: [PATCH -mm 0/3] i386 boot: replace boot_ioremap 
>with enhancedbt_ioremap
>
>On Tue, 2008-01-15 at 09:44 +0100, Ingo Molnar wrote:
>> * Huang, Ying <ying.huang@...el.com> wrote:
>> 
>> > This patchset replaces boot_ioremap with a enhanced version of 
>> > bt_ioremap and renames the bt_ioremap to early_ioremap. 
>This reduces 
>> > 12k from .init.data segment and increases the size of 
>memory that can 
>> > be re-mapped before paging_init to 64k.
>> 
>> in latest x86.git#mm there's an early_ioremap() introduced 
>as part of 
>> the PAT series - available on both 32-bit and 64-bit. Could 
>you take a 
>> look at it and use that if it's OK for your purposes?
>
>After checking the early_ioremap() implementation in
>arch/x86/kernel/setup_32.c, I found that it is a duplication of
>bt_ioremap() implementation in arch/x86/mm/ioremap_32.c. Both
>implementations use set_fixmap(), so they can be used only after
>paging_init().
>
>The early_ioremap implementation provided in this patchset works as
>follow:
>
>- Enhances bt_ioremap, make it usable before paging_init() via a
>dedicated PTE page.
>- Rename bt_ioremap to early_ioremap
>
>So I think maybe we should replace the early_ioremap() 
>implementation in
>PAT series with that of this series.
>

Agreed. PAT can use this for early mappings. Thanks for the patches :)

-Venki
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