linux-kernel - Re: Kconfig 'depend' vs. 'select'

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Message-ID: <20080428063953.GA2088@cs181133002.pp.htv.fi>
Date:	Mon, 28 Apr 2008 09:39:54 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Kconfig 'depend' vs. 'select'

On Sun, Apr 27, 2008 at 05:45:36PM -0700, David Miller wrote:
> 
> I'm trying to stir up interest in solving a problem that seems to pop
> up frequently. :)
> 
> The short story is:
> 
> 1) If you say your driver "depend"s on a subsystem providing a set of
>    interfaces you need, this doesn't work properly if your driver is
>    marked built-in and that subsystem you need is modular for some
>    reason.
>...

This should work.

Can you give an example of the problem you are thinking of?

> So if you had, for example:
> 
> config FOO_API
> 	...
> 
> and then you had two drivers:
> 
> config DRIVER1
> 	tristate ...
> 	needs FOO_API
> 
> config DRIVER2
> 	tristate ...
> 	needs FOO_API
> 
> and DRIVER1 was built modular but DRIVER2 was built-in,
> the Kconfig system would make sure FOO_API were built-in.
> 
> The "needs" name and syntax is just something arbitrary I came up
> with, don't take it too seriously :-)

What about "select"?

That's exactly what it's doing.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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