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

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Message-ID: <CAE9FiQU6RWH6cBKc9th3Eb2gCjcHfotbC1sYspQ7dU+cG=VMFA@mail.gmail.com>
Date:	Fri, 11 Jan 2013 11:59:37 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Renninger <trenn@...e.de>
Cc:	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, hpa@...or.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 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.

Thanks

Yinghai
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