linux-kernel - Re: [PATCH] fix dependency generation

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Message-ID: <Pine.LNX.4.64.0703311804230.14457@scrub.home>
Date:	Sat, 31 Mar 2007 18:11:36 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Sam Ravnborg <sam@...nborg.org>
cc:	Jan Beulich <jbeulich@...ell.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix dependency generation

Hi,

On Sat, 31 Mar 2007, Sam Ravnborg wrote:

> The problem is that tristate symbol represent three values.
> =n => CONFIG_SYMBOL is undefined
> =y => CONFIG_SYMBOL is defined
> =m => COMFIG_SYMBOL_MODULE is defined
> 
> The function split_config does not take into account the
> different values and 'fixing' this in fixdep is wrong.
> Because fixdep does not know if the variable is a tristate symbol or not
> so it can either blindly remove _MODULE (your patch)
> or each time it encounters _MODULE check for a symbol with and
> without _MODULE.

What really matters is that CONFIG_SYMBOL changed, one could optimize for 
the COMFIG_SYMBOL_MODULE case, but I don't think it's worth it, especially 
...

> The better fix is to teach the split_config function that
> for tristate symbols two files shall be created in the include/config
> hirachy. So for apm this gets:
> include/config/apm.h
> include/config/apm/module.h

if it requires thousands of new inodes for a feature which should be 
rarely used.

> This will make kconfig behave correct the day that someone add a config
> symbol with a _MODULE suffix.

I'd rather reserve that namespace, if it allows for the simpler version to 
just map all symbols to the basic config symbol name.

bye, Roman
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