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

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Message-ID: <CAOvWMLa334E8CYJLrHy6-0ZXBRneoMf-05v422SQw+dbGRubow@mail.gmail.com>
Date:	Thu, 30 Jan 2014 08:52:54 -0800
From:	Andiry Xu <andiry@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andiry Xu <andiry.xu@...il.com>
Subject: [BUG] Description for memmap in kernel-parameters.txt is wrong

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.

Unfortunately this is incorrect. The meaning of nn and ss is reversed.
For example:

Command                  Expected                 Result
memmap 2G$6G        6G - 8G reserved      2G - 8G reserved
memmap 6G$2G        2G - 8G reserved      6G - 8G reserved

Test kernel version 3.13, but I believe the issue has been there long ago.

I'm not sure whether the description or implementation should be
fixed, but apparently they do not match.

Thanks,
Andiry
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