linux-kernel - Re: [PATCH -v2 1/2] x86: Reserve [0xa0000, 0x100000] in e820 map

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Message-ID: <4BC4F9C2.20503@oracle.com>
Date:	Tue, 13 Apr 2010 16:09:54 -0700
From:	Yinghai <yinghai.lu@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Bjorn Helgaas <bjorn.helgaas@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andy Isaacson <adi@...apodia.org>, guenter.roeck@...csson.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH -v2 1/2] x86: Reserve [0xa0000, 0x100000] in e820 map

On 04/13/2010 04:07 PM, H. Peter Anvin wrote:
> On 04/13/2010 04:03 PM, Yinghai wrote:
>> On 04/13/2010 04:02 PM, H. Peter Anvin wrote:
>>>>
>>>> Are you sure? what is BAR range? greater than 1M ?
>>>>
>>>> e820_reserve_resources() will make that range to be reserved and BUSY in resource tree.
>>>> and if driver for that device want to call pci_request_region, it will get failure...
>>>>
>>>
>>> Yes, > 1 MB in that case, I'm fairly sure.
>>
>> that is ok. actually that is handled by e820_reserve_resource_late(), and it will not put BUSY on the entry at all.
>>
> 
> OK... why is that handled differently?

about one year ago, Linus made that change to use insert_resource_expand_to_fit() to honor PCI device BAR than E820_RESERVED.

YH
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