linux-kernel - Re: [PATCH] x86 e820: only void usable memory areas in memmap=exactmap case

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Message-ID: <50F08F43.7080604@zytor.com>
Date:	Fri, 11 Jan 2013 14:16:35 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Thomas Renninger <trenn@...e.de>,
	MUNEDA Takahiro <muneda.takahiro@...fujitsu.com>,
	Takao Indoh <indou.takao@...fujitsu.com>,
	linux-pci@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, andi@...stfloor.org,
	tokunaga.keiich@...fujitsu.com, kexec@...ts.infradead.org,
	hbabu@...ibm.com, mingo@...hat.com, ddutile@...hat.com,
	vgoyal@...hat.com, ishii.hironobu@...fujitsu.com,
	bhelgaas@...gle.com, tglx@...utronix.de, khalid@...ehiking.org,
	horms@...ge.net.au
Subject: Re: [PATCH] x86 e820: only void usable memory areas in memmap=exactmap
 case

On 01/11/2013 01:09 PM, Yinghai Lu wrote:
> On Fri, Jan 11, 2013 at 12:06 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> On 01/11/2013 11:59 AM, Yinghai Lu wrote:
>>> On Fri, Jan 11, 2013 at 10:24 AM, Thomas Renninger <trenn@...e.de> wrote:
>>>>> We may need to keep exactmap intact.
>>>> Why?
>>>> Kexec/kdump should have been the only user?
>>>> If older/current kexec calls still add ACPI maps via memmap=X#Y,
>>>> they should already exist in the original e820 map and fall off or
>>>> get glued to one region if (wrongly) overlapping via sanitize_map.
>>>
>>> No, kexec/kdump is not the only user for memmap=exactmap.
>>>
>>
>> Who is using it then, since you seem to know?
> 
> http://forums.gentoo.org/viewtopic-t-487476-highlight-proliant.html
> 
> http://forums.fedoraforum.org/archive/index.php/t-225347.html
> 

Hm... both of those seem to be someone trying memmap=exactmap to hack
around a problem which really was elsewhere, with a different solution.

	-hpa

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