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

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Date:	Tue, 15 Jan 2008 07:52:00 -0500
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Huang, Ying" <ying.huang@...el.com>
CC:	Ingo Molnar <mingo@...e.hu>, venkatesh.pallipadi@...el.com,
	akpm@...ux-foundation.org, 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 wrote:
> 
> 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.
> 

I did a quick scan over the patchset (not quite awake yet, so I may very 
well have missed something), but it looks like EFI (again!) is the only 
user of ioremapping before paging_init().  This makes me wonder if that 
code can't be restructured so that isn't necessary.

	-hpa

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