linux-kernel - Re: [PATCH -mm 0/3] i386 boot: replace boot_ioremap with enhanced bt

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Message-ID: <20080115133645.GH7025@elte.hu>
Date:	Tue, 15 Jan 2008 14:36:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	venkatesh.pallipadi@...el.com, 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 enhanced
	bt_ioremap


* Huang, Ying <ying.huang@...el.com> wrote:

> > 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.

yep, agreed, that would be nice.

	Ingo
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