linux-kernel - Re: [PATCH] x86: tidy e820 output

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Message-ID: <4C9A4AAF.3030503@zytor.com>
Date:	Wed, 22 Sep 2010 11:27:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: tidy e820 output

On 09/22/2010 11:20 AM, Bjorn Helgaas wrote:
> 
> These E820 ranges should be easily comparable with similar ranges we
> print elsewhere.  Currently we have things like this:
> 
>     BIOS-e820: 0000000000000000 - 000000000009f400 (usable)
>     BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
>     BIOS-e820: 00000000fffbc000 - 0000000100000000 (reserved)
>     pci_root PNP0A03:00: host bridge window [mem 0x000a0000-0x000bffff]
>     pci_root PNP0A03:00: host bridge window [mem 0xe0000000-0xfebfffff]
>     pci 0000:00:02.0: reg 10: [mem 0xf0000000-0xf1ffffff pref]
>     reserve RAM buffer: 000000000009f400 - 000000000009ffff 
>     pnp 00:07: [mem 0xfed00000-0xfed003ff]
> 
> It would be easier to integrate the E820 information with the ACPI
> and PCI window and BAR information if they looked similar.
> 
> We currently have a mix of some with "0x" prefix, some without;
> some with eight hex digits, some with sixteen; some with spaces
> around the internal "-", some without; some with type (io/mem/etc),
> some without; some with uppercase hex (MTRR), most with lowercase;
> some including the end address, some not; and even some in PFNs
> and most in addresses.  It just makes it harder than it needs
> to be to debug issues in this area.
> 

Yes, but I think you can also see why I really don't like the thought of
the numbers in the BIOS-e820: block not even lining up anymore.

	-hpa

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