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SubjectRe: My $0.02 on devd and devfs
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orc@pell.portland.or.us (david parsons) said:
> In article <linux.kernel.199910141142.IAA10452@pincoya.inf.utfsm.cl>,
> Horst von Brand <vonbrand@inf.utfsm.cl> wrote:
> >orc@pell.portland.or.us (david parsons) said:

> >[...]

> >> I think there may be a bit of confusion here. The PC-style ports
> >> already exist, and Linux already handles them. If I build a modular
> >> kernel (which I do), the current version of Linux will already do the
> >> fbm needed to load the drivers and give me access. If I use a
> >> devfs, current 2.3.x's will do the fbm needed to load the drivers and
> >> give me access without any changes to userland. But if I use devd as
> >> described in recent email on the kernel list, I either have to have
> >> the device nodes already installed or I have to bloat my kernel with
> >> the detection parts of the drivers or I have to build the drivers
> >> into the kernel.

> >The described kernel will notify devd to create the nodes when they show
> >up, i.e., on boot or when the device is plugged in.

> How?
>
> Until I insmod the parallel port driver, the kernel doesn't know
> that there are any parallel ports around.

Because it doesn't check before.

> >Any dynamic /dev will
> >have to include this exact functionality somehow,

> Perhaps it would be a good idea if you wasted the five minutes
> necessary to look at Richard Gooch's code before you commented
> further on it.

Look, to find out if the foo device is present, you _have_ to check
somehow. No way around that. I somehow seriously doubt devfs does some
mindreading trick here.
--
Dr. Horst H. von Brand mailto:vonbrand@inf.utfsm.cl
Departamento de Informatica Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria +56 32 654239
Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513

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