linux-kernel - Re: [PATCH] crash dump: don't delete non-E820

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Message-ID: <509726D0.4010606@zytor.com>
Date:	Mon, 05 Nov 2012 03:39:12 +0100
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Zhang, Jun" <jun.zhang@...el.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Fleming, Matt" <matt.fleming@...el.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] crash dump: don't delete non-E820_RAM during init

On 11/05/2012 02:37 AM, Zhang, Jun wrote:
> Hello, Gortmaker
> I will modify my subject. Thanks!
> 
> Hello, Anvin
> from our three options, I think third option is better. But in 3) option, there are two choose, 3.1) is like memmap=REMOVERAM, 3.2) is memmap=CRASHKDUMP.
> In 3.1) we maybe need ifdef/endif within the { } of the function (like exactmap).
> In 3.2) we can remove the ifdef/endif. 
> Which one is the better? Maybe you have a better solution, please share it. 
> Thanks!
> 
> Next is our three option.
> 1)  my patch.
> 2)  modify kexec, only pass two parameters -- memmap=544K@64K 
>     memmap=64964K@...68K, in kernel setup_memory_map, we can remove RAM 
>     range.
> 3)  add extra optional, 3.1) like memmap=REMOVERAM
>                    3.2) like memmap=CRASHKDUMP
> 

Again, 2 would be better because it is a localized change to kexec.  If
that works I don't see why there is any reason to change anything else.

	-hpa


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