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

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Message-ID: <CAMOw1v6gUt1AwrVLK4dAYb6_VHTQ4M2gv3eC1E3Rx=pT2P2_8Q@mail.gmail.com>
Date:	Wed, 3 Jul 2013 18:31:35 -0300
From:	Lucas De Marchi <lucas.demarchi@...fusion.mobi>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Andy Lutomirski <luto@...capital.net>,
	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 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)

Lucas De Marchi
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