linux-kernel - Re: [patch 1/3] Input: psmouse - create PS/2 protocol options for Kconfig

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Date:	Fri, 16 Feb 2007 00:34:24 -0500
From:	Andres Salomon <dilinger@...ian.org>
To:	Dmitry Torokhov <dtor@...ightbb.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/3] Input: psmouse - create PS/2 protocol options for
 Kconfig

Dmitry Torokhov wrote:
> On Thursday 15 February 2007 20:30, Andrew Morton wrote:
>> On Thu, 15 Feb 2007 19:55:29 -0500
>> Andres Salomon <dilinger@...ian.org> wrote:
[...]
>> Perhaps a nicer implementation would be to have a separate .c file for each
>> variant.
>>
> 
> Having completely separate sub-drivers is very hard because of very delicate
> PS/2 protocol probing....
> 
> What do you think about patch below? It somewhat reduces #ifdef clutter in main
> module moving it in .h files...
>  

Normally, I'm a fan of that sort of thing.  However, in this case, I
think it makes sense to have the #ifdefs right in the probe function; at
least for me, it makes it easier to understand what's going on.  The
synaptics stuff is especially tricky; with a cursory glance over the
code, one might assume that all the synaptics functions disappear when
CONFIG_MOUSE_PS2_SYNAPTICS is unset.  However, if the #ifdef's are in
the probe function, it's pretty clear that some synaptics functions
still get called even when CONFIG_MOUSE_PS2_SYNAPTICS is unset.

Just my opinion, anyways.
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