linux-kernel - Re: [PATCH] x86, AMD, NB: Cleanup and improve NB descriptors handling

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Message-ID: <507D6B67.2010009@numascale-asia.com>
Date:	Tue, 16 Oct 2012 22:12:55 +0800
From:	Daniel J Blueman <daniel@...ascale-asia.com>
To:	Borislav Petkov <bp@...64.org>
CC:	Steffen Persvold <sp@...ascale.com>, X86-ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH] x86, AMD, NB: Cleanup and improve NB descriptors handling

On 16/10/2012 22:06, Borislav Petkov wrote:
> From: Borislav Petkov <borislav.petkov@....com>
>
> First of all, the double loop of first counting the northbridges on
> the system, then allocating them and then going over them again was
> bugging me for a long time now. Fix it by moving the allocation of the
> descriptors in the initial iteration path.
>
> Then, modify the enclosing _info structure to contain two NB descriptor
> structures: and array of 8 NB descs which contains the first 8 possible
> NB descriptors for all single-board AMD systems out there. This is no
> different from the current state of affairs and is done this way so that
> lookup of those descriptors remains fast.
>
> Then, there's a linked list of further NB descs which are for large,
> confederated systems like NumaScale where more than 8 nodes are present
> in the fabric and are visible to the single system Linux image. We keep
> those unique by introducing the PCI domain ID into the node ID used for
> descriptor lookup.
>
> Rest of the code is cleanup and readability improvements.
[...]

Looks good.

I recall there were some other areas that needed fixing, so I'll rebase
on top of this tomorrow and present my change so far.

Thanks,
Daniel

-- 
Daniel J Blueman
Principal Software Engineer, Numascale Asia

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