Re: [PATCH] backlight: lcd: Remove dependency from the framebuffer layer

["Antonino A. Daplas" <adaplas@gmail.com>]

Andrew Morton wrote:
> On Tue, 11 Jul 2006 15:04:08 +0800
> "Antonino A. Daplas" <adaplas@gmail.com> wrote:
> 
>> +#if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
>> +			   defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
> 
> Peeking at CONFIG_FB_MODULE like this is considered sinful.
> 
> <tries to remember why>
> 
> Because someone might build a CONFIG_FB=n, CONFIG_FB_MODULE=n kernel, then
> later build the fbdev module for that kernel only to find that the
> backlight driver doesn't know that the fbdev module is available.
> 
> Or something like that.  It's pretty contrived, and I really doubt that
> anyone's going to try to cobble together a kernel like that.
> 
> Or maybe there's a better reason...

That's the simplest method I can think of to prevent impossible
combinations such as CONFIG_FB=m, CONFIG_BACKLIGHT_CLASS_DEVICE=y
without having to use 'depend' or 'select' in Kconfig, or God forbid,
inter_module_get().

I should have added a comment that I also don't like the hackishness
of this method.

Thinking about this a little more carefully now, how about we just statically
link the fb notification?
 
I'll see if I can send an update for that.

Tony

 

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