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

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Message-Id: <1200390535.3505.62.camel@caritas-dev.intel.com>
Date:	Tue, 15 Jan 2008 17:48:55 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Ingo Molnar <mingo@...e.hu>, venkatesh.pallipadi@...el.com
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 enhanced
	bt_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.

Best Regards,
Huang Ying

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