linux-kernel - Re: Building two (external) modules from the same sources

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Message-ID: <20081001200548.GA30009@kroah.com>
Date:	Wed, 1 Oct 2008 13:05:48 -0700
From:	Greg KH <greg@...ah.com>
To:	Andrey Borzenkov <arvidjaar@...l.ru>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-kbuild@...r.kernel.org, TJ <tj@...orld.net>,
	"Casual J. Programmer" <casualprogrammer@...glemail.com>
Subject: Re: Building two (external) modules from the same sources

On Wed, Oct 01, 2008 at 02:13:10PM +0400, Andrey Borzenkov wrote:
> On Wednesday 01 October 2008, Greg KH wrote:
> > On Mon, Sep 29, 2008 at 09:49:34AM +0400, Andrey Borzenkov wrote:
> > > I have here driver that can be built for two different types of
> > > hardware from basically the same sources (this is port of old Agere
> > > drivers for Hermes-I/Hermes-II chipsets).
> > 
> > Cool, do you have a link to the code, I'd be glad to add it to
> > drivers/staging/ if it's not in a fully-mergable state yet to get wider
> > users for it.
> > 
> 
> You can look at it here: http://arvidjaar.newmail.ru/wlags49.tar.bz
> 
> I doubt that it is suitable for inclusion at current state if ever.
> This is taken directly from Agere 2.4 sources; the only parts that were
> touched are kernel glue and wireless extensions interface.

It is acceptable for inclusion in drivers/staging/ where we can work on
cleaning it up from within the kernel environment, and provide access to
users who are wanting to use these drivers now.

Is it ok if I add it there?  I'll take the above tarball and make up the
proper patch and get it to build.

> And it is not GPL'ed, of course. I attach E-Mail I received a while
> back with answere from Agere legal department.

It's BSD, which is fine, that works with the GPLv2 license of the rest
of the kernel.

> > > Build differs only in one define -DHERMES2 and single file with
> > > different firmware. Unfortunately "if HII" are spread over sources
> > > which makes splitting of sources rather questionable.
> > > 
> > > What is the best way (from kbuild POV) to build two modules - for H-I
> > > and H-II - from the same set of source files?
> > 
> > Not to create two different modules, but rather have one module that
> > works for both pieces of hardware, with dynamic checks for the different
> > portions.
> > 
> 
> I can't; one of the reasons being - I have no idea how to do it. Original
> sources build separate modules for every flavour of driver. It is just that
> I was recently asked about this driver on Zaurus (which happens to use
> Hermes-II); so I had to do something about it.

Hm, I'll look at the code and see if I see anything obvious.

> If someone could offer (link to) hermes-1/2 programming manual ...

That would probably help out a lot :)

thanks,

greg k-h
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