netdev - Re: [PATCH net-next] Amiga PCMCIA 100 MBit card support

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Date:   Fri, 28 Dec 2018 12:43:30 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     schmitzmic@...il.com
Cc:     alex@...ik.de, netdev@...r.kernel.org, linux-m68k@...r.kernel.org,
        rolf.anders@...sik.uni-augsburg.de
Subject: Re: [PATCH net-next] Amiga PCMCIA 100 MBit card support

From: Michael Schmitz <schmitzmic@...il.com>
Date: Sat, 22 Dec 2018 10:30:58 +1300

> Am 21.12.2018 um 13:10 schrieb David Miller:
>> And in particular this huge complicated Kconfig construct is not
>> maintainable at all.
> 
> We can trim this down a bit (for reasons I've outlined before):
> 
> +if APNE
> +config APNE100MBIT
> +	bool "PCMCIA NE2000 100MBit support"
> +	default n
> +	depends on NE2000=n && PCMCIA_AXNET=n
> +	depends on PCMCIA_PCNET=n && STNIC=n && ULTRA=n && WD80x3=n
> 
> In all honesty, I doubt anyone could ever use the stnic, ultra and wd
> drivers on m68k (Geert?) so these could be omitted as well. Not sure
> pcnet_cs or axnet_cs are possible to use on the Amiga PCMCIA slot, so
> all that remains in practice is the ne driver (which is used on
> Atari).
> 
> Still too ugly?

I'm sorry, maybe I didn't express my concern clearly.

Any sizable list of exceptions in a Kconfig conditional has long term
maintainence costs.  If, for some reason, a new variant of support
for this chip arrives there will be a new Kconfig setting that would
need to be added here to your expressions.

That is insanely error prone, and I can guarantee it will get missed.

Having so many front end drivers for a chipset should be done in a
more modular manner, so that in fact they could all coexist if
necessary.