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Date: Wed, 22 Jun 2011 11:15:30 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Stefan Assmann <sassmann@kpanic.de>
CC: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        akpm@linux-foundation.org, tony.luck@intel.com, andi@firstfloor.org,
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Subject: Re: [PATCH v2 0/3] support for broken memory modules (BadRAM)
References: <1308741534-6846-1-git-send-email-sassmann@kpanic.de>
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On 06/22/2011 04:18 AM, Stefan Assmann wrote:
> 
> The idea is to allow the user to specify RAM addresses that shouldn't be
> touched by the OS, because they are broken in some way. Not all machines have
> hardware support for hwpoison, ECC RAM, etc, so here's a solution that allows to
> use bitmasks to mask address patterns with the new "badram" kernel command line
> parameter.
> Memtest86 has an option to generate these patterns since v2.3 so the only thing
> for the user to do should be:
> - run Memtest86
> - note down the pattern
> - add badram=<pattern> to the kernel command line
> 

We already support the equivalent functionality with
memmap=<address>$<length> for those with only a few ranges... this has
been supported for ages, literally.  For those with a lot of ranges,
like Google, the command line is insufficient.

	-hpa
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