linux-kernel - Re: [RESEND PATCH v2 1/2] update mem= option's spec according to its implementation

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Message-ID: <CAHGf_=oDTLC8ebNgwCbT7NyxLre9c8ZokEKgjrORgzaHfZsTqQ@mail.gmail.com>
Date:	Fri, 19 Oct 2012 14:11:31 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	wency@...fujitsu.com
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, rob@...dley.net,
	tglx@...utronix.de, mingo@...hat.com, bhelgaas@...gle.com,
	hpa@...or.com, isimatu.yasuaki@...fujitsu.com,
	muneda.takahiro@...fujitsu.com
Subject: Re: [RESEND PATCH v2 1/2] update mem= option's spec according to its implementation

On Fri, Oct 19, 2012 at 6:16 AM,  <wency@...fujitsu.com> wrote:
> From: Wen Congyang <wency@...fujitsu.com>
>
> Current mem= implementation seems buggy because specification and
> implementation doesn't match. Current mem= has been working
> for many years and it's not buggy, it works as expected. So
> we should update the specification.
>
> Signed-off-by: Wen Congyang <wency@...fujitsu.com>
> Sort-of-tentatively-acked-by: Rob Landley <rob@...dley.net>
> ---
>  Documentation/kernel-parameters.txt |    7 ++++---
>  1 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 9776f06..85b911a 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1481,9 +1481,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>         mem=nn[KMG]     [KNL,BOOT] Force usage of a specific amount of memory
>                         Amount of memory to be used when the kernel is not able
>                         to see the whole system memory or for test.
> -                       [X86-32] Use together with memmap= to avoid physical
> -                       address space collisions. Without memmap= PCI devices
> -                       could be placed at addresses belonging to unused RAM.
> +                       [X86-32] Work as limiting max address. Use together
> +                       with memmap= to avoid physical address space collisions.
> +                       Without memmap= PCI devices could be placed at addresses
> +                       belonging to unused RAM.

If my remember is correct, x86-64 also specify maximum address.
but my remember is not clear.
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