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

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Message-ID: <CAOmQrk1aghJrFb6RNO1yTwN51Brk_88O9k8OuCm_QshP3zag-Q@mail.gmail.com>
Date:	Thu, 30 Jan 2014 15:43:50 -0800
From:	Andiry Xu <andiry.xu@...il.com>
To:	Randy Dunlap <rdunlap@...radead.org>
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 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?

Thanks,
Andiry
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