linux-kernel - Re: [PATCH v12 4/5] arm64, numa: Add NUMA support for arm64 platforms.

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Date:	Mon, 29 Feb 2016 11:12:36 +0100
From:	Robert Richter <robert.richter@...iumnetworks.com>
To:	Ganapatrao Kulkarni <gpkulkarni@...il.com>
CC:	David Daney <ddaney@...iumnetworks.com>,
	Will Deacon <will.deacon@....com>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	<linux-efi@...r.kernel.org>, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	David Daney <david.daney@...ium.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	David Daney <ddaney.cavm@...il.com>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	Frank Rowand <frowand.list@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v12 4/5] arm64, numa: Add NUMA support for arm64
 platforms.

On 27.02.16 09:43:49, Ganapatrao Kulkarni wrote:
> On Sat, Feb 27, 2016 at 1:21 AM, David Daney <ddaney@...iumnetworks.com> wrote:
> > On 02/26/2016 10:53 AM, Will Deacon wrote:

> >>> +static __init int numa_parse_early_param(char *opt)
> >>> +{
> >>> +       if (!opt)
> >>> +               return -EINVAL;
> >>> +       if (!strncmp(opt, "off", 3)) {
> >>> +               pr_info("%s\n", "NUMA turned off");
> >>> +               numa_off = 1;
> >>> +       }
> >>> +       return 0;
> >>> +}
> >>> +early_param("numa", numa_parse_early_param);
> >>
> >>
> >> Curious, but when is this option actually useful?
> >>
> >
> > Good point.  I will remove that bit, it was used as an aid in debugging
> > while bringing up the patch set.
> 
> this is handy in debugging new platforms.
> this boot argument option forces to boot as single node dummy system
> adding all resources to node0.

This is used to disable numa in a numa enabled kernel esp. for
debugging/enabling/booting single node systems. Same kernel parameter
as for x86 and other archs. Should not being removed.

-Robert