linux-kernel - Re: [PATCH 2/2] x86 e820: Introduce memmap=resetusablemap for kdump usage

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Message-ID: <CAE9FiQWJqWQJhoJb2dBn=iAsKjxuf3MJro-jz+6k+WNZor8-xQ@mail.gmail.com>
Date:	Tue, 22 Jan 2013 12:06:47 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Renninger <trenn@...e.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	vgoyal@...hat.com, horms@...ge.net.au
Subject: Re: [PATCH 2/2] x86 e820: Introduce memmap=resetusablemap for kdump usage

On Tue, Jan 22, 2013 at 8:32 AM, H. Peter Anvin <hpa@...or.com> wrote:
>> Again: Please explain what is bad with this solution.
>> I cannot see a better and more robust way for kdump other than
>> reserving the original reserved memory areas as declared by the BIOS.
>
> It is bad because it creates more complexity than is needed.
>
> The whole point is that what we want is simply to switch type 1 to type
> X, with the sole exceptions being the areas explicitly reserved for the
> kdump kernel.

Do you prefer to  "reserveram" way in attached patch?

Thanks

Yinghai

Download attachment "e820_reserveram.patch" of type "application/octet-stream" (1770 bytes)