linux-kernel - Re: [PATCH 0/2] Relax restrictions on setting CONFIG

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Date:	Wed, 23 Jan 2008 11:45:14 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	mingo@...e.hu, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	apw@...dowen.org
Subject: Re: [PATCH 0/2] Relax restrictions on setting CONFIG_NUMA on x86

> > i386 already has srat parsing code (just written in a horrible hackish
> > way); but it exists arch/x86/kernel/srat_32.c
>
> Yes, I spotted that. Enabling it required a Kconfig change 

does it? I was pretty sure that a !NUMAQ i386 CONFIG_NUMA build
already used that. At least that was the case when I last looked. If that
has changed it must have bitrotted recently.

> or two and 
> enabling BOOT_IOREMAP. It then crashes early in boot on a call to strlen()
> so I went with the stubs and SRAT disabled for the moment.

Crashed on a Opteron box? That was always the case

If it crashed on a (older) Summit then it likely bitrotted, because that 
worked at some point. The code was originally written by Pat G. for Summit1
and I believe was at least used by some people (no distributions) for S2,
possible 3 too.

> Ok, understood. When I next revisit this, I'll look at making ACPI_SRAT
> and BOOT_IOREMAP work on normal machines and see what happens. Thanks.

Again the problem shouldn't be normal machines, but non Summit NUMA systems.

-Andi

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