Re: [PATCH] add options to udevtrigger to control scanning

[Greg KH <greg@kroah.com>]

On Thu, Aug 31, 2006 at 10:46:12AM +0200, Kay Sievers wrote:
> On Wed, Aug 30, 2006 at 05:41:38PM -0700, Greg KH wrote:
> > This patch has been in the gentoo tree for a bit.  It modifies
> > udevtrigger to allow a little more fine grained control for people who
> > don't want all of the sysfs tree to be scanned by udevtrigger at
> > startup.
> 
> When is it useful to have such options. And "no" flags who negate
> something from all events sounds pretty odd to me.

Well, either that or force the --scan-class options to be used :)

> The Ubuntu guys use a patch which can filter on values to have control
> over what is triggered and what not. If we are going that road, I like
> their patch more than this.

Do you have a pointer to where this patch is?

> But in both cases, please explain in which situations this is really
> needed?

People do not want all of their devices probed for at boot time, they
want to load the modules that they know they want, on their own.  So
they don't want all of the modalias files being poked at.

In short, they don't like the "coldplug" functionality for loading
modules and only want udev to handle the device nodes present at boot
time.  I don't blame them for wanting this because with machines that
you know all the hardware, it isn't necessary, and does speed up the
boot process ever so slightly.

And yes, they can use the blacklist functionality from
module-init-tools, except that seems to be broken right now in the
Gentoo releases, and I'm having a hard time figuring out why.  It used
to work...

So this could be reduced to just the one option, --no-scan-bus, as that
is all that Gentoo currently uses.  I think the original author was just
trying to be nice in giving all possible options :)

Would you be more comfortable with just that option being added?  The
filter seems a bit complicated, unless you are able to specify all
modalias files.

thanks,

greg k-h

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