linux-kernel - Re: How to compile module params into kernel?

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Message-ID: <653402b90611081216o640b1499u8c758775c1cceb51@mail.gmail.com>
Date:	Wed, 8 Nov 2006 20:16:35 +0000
From:	"Miguel Ojeda" <maxextreme@...il.com>
To:	"Jesper Juhl" <jesper.juhl@...il.com>
Cc:	"Joakim Tjernlund" <joakim.tjernlund@...nsmode.se>,
	linux-kernel@...r.kernel.org
Subject: Re: How to compile module params into kernel?

On 11/8/06, Jesper Juhl <jesper.juhl@...il.com> wrote:
> On 08/11/06, Joakim Tjernlund <joakim.tjernlund@...nsmode.se> wrote:
> > > -----Original Message-----
> > > From: Jesper Juhl [mailto:jesper.juhl@...il.com]
> > >
> > > On 08/11/06, Joakim Tjernlund <joakim.tjernlund@...nsmode.se> wrote:
> > > > Instead of passing a module param on the cmdline I want to
> > > compile that
> > > > into
> > > > the kernel, but I can't figure out how.
> > > >
> > > > The module param I want compile into kernel is
> > > > rtc-ds1307.force=0,0x68
> > > >
> > > > This is for an embeddet target that doesn't have loadable module
> > > > support.
> > > >
> > > You could edit the module source and hardcode default values.
> > >
> >
> > Yes, but I don't want to do that since it makes maintance
> > harder.
> >
> Well, as far as I know, there's no way to specify default module
> options at compile time. The defaults are set in the module source and
> are modifiable at module load time or by setting options on the kernel
> command line at boot tiem. So, if that's no good for you I don't see
> any other way except modifying the source to hardcode new defaults.
>

You can add parameter values at Kconfig using "int", "hex"... instead
of tristate, and then do something like:

static unsigned int foo = CONFIG_foo;
module_param(foo, uint, S_IRUGO);
MODULE_PARM_DESC(foo, "foo value (uint)");
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