linux-kernel - Re: [PATCH] To crash dump, we need keep other memory type except E820_RAM, because other type come from BIOS or firmware is used by other code(for example: PCI

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Date:	Fri, 02 Nov 2012 09:37:46 -0700
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] To crash dump, we need keep other memory type except
 E820_RAM, because other type come from BIOS or firmware is used by other
 code(for example: PCI_MMCONFIG).

On 11/01/2012 01:49 AM, Zhang, Jun wrote:
> Hello, Anvin
> 
> Thank for your advice.
> 
> Hello, All
> 
> the next patch is made by 2), please review it. Thanks!
> 

No, it is not.

You are still modifying the behavior of the kernel depending on
CONFIG_CRASH_DUMP.

CONFIG_CRASH_DUMP doesn't mean "we are doing a crash dump".  It means
"it is possible to use this kernel to do a crash dump".

Either you are using standard kernel parameters in a standard way which
is what option 2 was supposed to be -- it should require no kernel
changes! -- or you have to put something in a code path specific to a
crash dump.

	-hpa

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