linux-kernel - Re: [BUG] Description for memmap in kernel-parameters.txt is wrong

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Message-ID: <52EAE51D.4030709@infradead.org>
Date:	Thu, 30 Jan 2014 15:49:49 -0800
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Andiry Xu <andiry.xu@...il.com>
CC:	David Rientjes <rientjes@...gle.com>, Andiry Xu <andiry@...il.com>,
	linux-kernel@...r.kernel.org, Linux MM <linux-mm@...ck.org>
Subject: Re: [BUG] Description for memmap in kernel-parameters.txt is wrong

On 01/30/2014 03:43 PM, Andiry Xu wrote:
> On Thu, Jan 30, 2014 at 2:54 PM, Randy Dunlap <rdunlap@...radead.org> wrote:
>> On 01/30/2014 02:17 PM, David Rientjes wrote:
>>> On Thu, 30 Jan 2014, Randy Dunlap wrote:
>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> In kernel-parameters.txt, there is following description:
>>>>>>>
>>>>>>> memmap=nn[KMG]$ss[KMG]
>>>>>>>                         [KNL,ACPI] Mark specific memory as reserved.
>>>>>>>                         Region of memory to be used, from ss to ss+nn.
>>>>>>
>>>>>> Should be:
>>>>>>                           Region of memory to be reserved, from ss to ss+nn.
>>>>>>
>>>>>> but that doesn't help with the problem that you describe, does it?
>>>>>>
>>>>>
>>>>> Actually it should be:
>>>>>                              Region of memory to be reserved, from nn to nn+ss.
>>>>>
>>>>> That is, exchange nn and ss.
>>>>
>>>> Yes, I understand that that's what you are reporting.  I just haven't yet
>>>> worked out how the code manages to exchange those 2 values.
>>>>
>>>
>>> It doesn't, the documentation is correct as written and could be improved
>>> by your suggestion of "Region of memory to be reserved, from ss to ss+nn."
>>> I think Andiry probably is having a problem with his bootloader
>>> interpreting the '$' incorrectly (or variable expansion if coming from the
>>> shell) or interpreting the resulting user-defined e820 map incorrectly.
>>> --
>>
>> Yeah, I certainly don't see a problem with the code and I would want to
>> see/understand that before I exchanged the 2 values in the documentation.
>>
>> I'll submit a patch to make the wording a bit better.
>>
> 
> I'm using Ubuntu 13.04 with GRUB2. If it's a bootloader issue, what should I do?

See https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/448413

i.e., use shell escape '\' character.

-- 
~Randy
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