linux-kernel - Re: [PATCH] x86/pci: make pci_mem

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Date:	Sat, 18 Apr 2009 16:04:08 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Yinghai Lu <yinghai@...nel.org>
cc:	Ingo Molnar <mingo@...e.hu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org, yannick.roehlly@...e.fr
Subject: Re: [PATCH] x86/pci: make pci_mem_start to be aligned only -v4



On Sat, 18 Apr 2009, Yinghai Lu wrote:
> 
> with
> [    0.000000] BIOS-provided physical RAM map:
> [    0.000000]  BIOS-e820: 0000000000000100 - 0000000000097400 (usable)
> [    0.000000]  BIOS-e820: 0000000000097400 - 00000000000a0000 (reserved)
> [    0.000000]  BIOS-e820: 0000000000100000 - 00000000b7fa0000 (usable)
> [    0.000000]  BIOS-e820: 00000000b7fae000 - 00000000b7fb0000 (usable)
> [    0.000000]  BIOS-e820: 00000000b7fb0000 - 00000000b7fbe000 (ACPI data)
> [    0.000000]  BIOS-e820: 00000000b7fbe000 - 00000000b7ff0000 (ACPI NVS)
> [    0.000000]  BIOS-e820: 00000000b7ff0000 - 00000000b8000000 (reserved)
> [    0.000000]  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
> [    0.000000]  BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
> [    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
> [    0.000000]  BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved)
> [    0.000000]  BIOS-e820: 0000000100000000 - 0000002048000000 (usable)
> 
> got
> 
> 00000100-000973ff : System RAM
> 00097400-0009ffff : reserved
> 000a0000-000bffff : PCI Bus #00
> 000c0000-000cffff : pnp 00:0c
> 000e0000-000fffff : pnp 00:0c
> 00100000-b7f9ffff : System RAM
>   00200000-00c68f6b : Kernel code
>   00c68f6c-01332f7f : Kernel data
>   015a6000-01fcaa57 : Kernel bss
>   20000000-23ffffff : GART
> b7fa0000-b7fadfff : RAM buffer
> b7fae000-b7faffff : System RAM
> b7fb0000-b7fbdfff : ACPI Tables
> b7fbe000-b7feffff : ACPI Non-volatile Storage
> b7ff0000-b7ffffff : reserved

Hmm. That looks correct to me. We filled in that odd area between 
b7fa0000-b7fadfff that went unmentioned in the e820 tables.

And that _is_ a really odd hole. I wonder what it is all about. But the 
approach does seem to have done the right thing.

			Linus
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