linux-kernel - Re: what means "module_param(channel_mask, channel

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Message-ID: <alpine.LFD.2.00.0907110704540.4491@localhost>
Date:	Sat, 11 Jul 2009 07:07:23 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...shcourse.ca>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: what means "module_param(channel_mask, channel_mask, 0644)"?

On Sat, 11 Jul 2009, Robert P. J. Day wrote:

>   researching my next newbie column about module parameters and i
> ran across the following:
>
> drivers/input/misc/ati_remote2.c:module_param(channel_mask, channel_mask, 0644);
> drivers/input/misc/ati_remote2.c:module_param(mode_mask, mode_mask, 0644);
>
> i have no idea what it means to have the second (type) field of
> module_param() simply repeat the name of the parameter.  is this
> some strange magic?  those two names don't *appear* to be typedef'ed
> anywhere i can see.

  i should have added that the reason i ran across this was that i was
curious if anyone was using User Defined Parameter Types as explained
here:

http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:module_parameters

so i did a quick grep for any invocations of module_param() whose type
wasn't one of the standard int, boot, short, ... etc ... and those two
hits above showed up, which confused me.

  so ... *is* anyone taking advantage of user-defined module parameter
types?  not as i can tell, but maybe i just missed it.

rday
--

========================================================================
Robert P. J. Day                               Waterloo, Ontario, CANADA

        Linux Consulting, Training and Annoying Kernel Pedantry.

Web page:                                          http://crashcourse.ca
Twitter:                                       http://twitter.com/rpjday
"Kernel Newbie Corner" column @ linux.com:          http://cli.gs/WG6WYX
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