linux-kernel - Re: [RFC PATCH] Allow optional module parameters

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Message-ID: <CALCETrWK7qAN_zzoK0ojOHqh7Rtrno1DhZb+jtVJMCuXMUfOuw@mail.gmail.com>
Date:	Wed, 3 Jul 2013 14:36:48 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Lucas De Marchi <lucas.demarchi@...fusion.mobi>
Cc:	Michal Marek <mmarek@...e.cz>, Jonathan Masters <jcm@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ben Hutchings <bhutchings@...arflare.com>,
	"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>
Subject: Re: [RFC PATCH] Allow optional module parameters

On Wed, Jul 3, 2013 at 2:31 PM, Lucas De Marchi
<lucas.demarchi@...fusion.mobi> wrote:
> On Wed, Jul 3, 2013 at 6:23 PM, Michal Marek <mmarek@...e.cz> wrote:
>> Dne 3.7.2013 23:17, Andy Lutomirski napsal(a):
>>> On Wed, Jul 3, 2013 at 2:03 PM, Michal Marek <mmarek@...e.cz> wrote:
>>>> Dne 1.7.2013 18:33, Jonathan Masters napsal(a):
>>>>> One caveat. Sometimes we have manufactured parameters intentionally
>>>>> to cause a module to fail. We should standardize that piece.
>>>>
>>>> You have:
>>>>
>>>>   blacklist foo
>>>>
>>>> to prevent udev from loading a module and
>>>>
>>>>   install foo /bin/true
>>>>
>>>> to prevent modprobe from loading the module at all. What is the
>>>> motivation for inventing a third way, through adding invalid parameters?
>>>>
>>>
>>> FWIW, I've occasionally booted with modulename.garbage=1 to prevent
>>> modulename from loading at boot.  It may be worth adding a more
>>> intentional way to do that.
>>
>> Hm, right, there seems to be no clean way to achieve this via a
>> commandline argument. Maybe define a magic module option to tell the
>> module loader not to load a module?
>
> modprobe.blacklist=modname1,modname2,... is already there, though all
> the silliness of blacklist applies unless "-b" is passed (that's the
> equivalent behavior of udev)

That would probably be good enough for me.

It would be neat if this worked for built-in "modules" as well, but
that would probably be quite intrusive.

--Andy
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