linux-kernel - Re: [PATCH 1/2] acpi memory hotplug, add parameter to disable memory hotplug [v2]

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Message-ID: <1389389641.1792.173.camel@misato.fc.hp.com>
Date:	Fri, 10 Jan 2014 14:34:01 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linn Crosetto <linn@...com>, Pekka Enberg <penberg@...nel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tang Chen <tangchen@...fujitsu.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Vivek Goyal <vgoyal@...hat.com>, kosaki.motohiro@...il.com,
	dyoung@...hat.com, linux-acpi@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/2] acpi memory hotplug, add parameter to disable
 memory hotplug [v2]

On Fri, 2014-01-10 at 14:04 -0500, Prarit Bhargava wrote:
 :
> ---
>  Documentation/kernel-parameters.txt |    3 +++
>  drivers/acpi/acpi_memhotplug.c      |   12 ++++++++++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index b9e9bd8..41374f9 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -2117,6 +2117,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>  
>  	nomce		[X86-32] Machine Check Exception
>  
> +	acpi_no_memhotplug [ACPI] Disable memory hotplug.  Useful for kexec
> +			   and kdump kernels.
> +

Please move it to where other acpi_xxx are described.

For kdump kernel, this option will be used when memmap=exactmap is
deprecated.  IOW, it is not useful yet.  Not sure what you mean by kexec
kernel.  Memory hotplug does not need to be disabled for kexec reboot.

Thanks,
-Toshi



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