From: Andrey Borzenkov <arvidjaar@mail.ru>
To: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [PNP] 'modalias' sysfs export
Date: Sat, 11 Mar 2006 20:07:24 +0300
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Cc: Pierre Ossman <drzeus-list@drzeus.cx>, Kay Sievers <kay.sievers@vrfy.org>,
       Arjan van de Ven <arjan@infradead.org>
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> Arjan van de Ven wrote:
> > On Sat, 2006-03-11 at 17:05 +0100, Pierre Ossman wrote:
> >> Here is a patch for doing multi line modalias for PNP devices. This will
> >> break udev, so that needs to be updated first.
> >
> > how could this EVER be acceptable???
>
> Soon I would hope. The modalias attribute currently only supports one
> alias (i.e. one line). This isn't enough for PNP, so if we want to
> support that bus (which I assume we do) we need to extend the interface.
> udev could be updated and be backwards compatible, the kernel can not
> (excluding adding another interface to the same data). So this patch
> should lag the update to udev a bit (i.e. I'm not suggesting it be
> applied now).

actually it is not that much udev but modprobe issue and modprobe already 
supports multiple modules on command line (modprobe --all, module-init-tools 
3.3.2 that I have here). So assuming module aliases cannot have embedded 
spaces and udev properly space-splits command line (I have not checked, but 
it should be the case IIRC) udev simply has to use 'modprobe --all $modalias' 
to be compatible with this patch. It also remains backwards compatible with 
single-alias modalias.

Or do I miss something obvious here? I understand that alternative is to make 
every alias appear as separate device in sysfs, but I do not know PNP 
structure well enough to decide if it makes sense.

- -andrey
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