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Re: Kernel modules in initrd


From: Ludovic Courtès
Subject: Re: Kernel modules in initrd
Date: Tue, 27 Feb 2018 16:02:16 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

Danny Milosavljevic <address@hidden> skribis:

> So what we would need next is something like modprobe written in guile.
>
> I think that ./gnu/build/linux-modules.scm load-linux-module* already does 
> that.
>
> The only part missing is to replace %modprobe-wrapper by a guile script
> which imports ./gnu/build/linux-modules.scm load-linux-module*, interprets
> some of the modprobe options and then masquerades as modprobe without invoking
> modprobe.
>
> The reason is that the kernel calls us back when it needs a module (for
> example when you mount something and it needs a charset converter or 
> something).
>
> (the name of the executable invoked is configured via 
> /proc/sys/kernel/modprobe)
>
> This can happen quite early in the boot process - and it took me some time
> to get the order and also the environment variables right.  We should be able
> to reuse that for the pure Guile modprobe.
>
> After the patch we don't *manually* load any of the modules - and all the
> tests work.  I booted my system with it - that also works.

I see, that’s a workable plan, we should do that!

> P.S. How come glibc is in the initrd?  Shouldn't guile have statically linked 
> it?
> glibc is like 50000 kiB.  In that case saving 800 kiB is not really worth 
> it...

One of the packages that ends up in the initrd must be dynamically
linked.  You need to find out which one it is.

Thanks for the explanations!

Ludo’.



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