linux-kernel - Re: [RFC 1/4] CONFIG

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Message-ID: <20070601205519.GA4469@uranus.ravnborg.org>
Date:	Fri, 1 Jun 2007 22:55:19 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, clameter@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [RFC 1/4] CONFIG_STABLE: Define it

On Fri, Jun 01, 2007 at 04:30:06PM -0400, Dave Jones wrote:
> On Fri, Jun 01, 2007 at 10:22:02PM +0200, Sam Ravnborg wrote:
>  > On Fri, Jun 01, 2007 at 02:02:00PM -0400, Dave Jones wrote:
>  > > On Thu, May 31, 2007 at 11:30:46PM +0200, Sam Ravnborg wrote:
>  > >  > > +	sym = sym_lookup("DEVEL_KERNEL", 0);
>  > >  > > +	sym->type = S_BOOLEAN;
>  > >  > > +	sym->flags |= SYMBOL_AUTO;
>  > >  > > +	p = getenv("DEVEL_KERNEL");
>  > >  > > +	if (p && atoi(p))
>  > >  > > +		sym_add_default(sym, "y");
>  > >  > > +	else
>  > >  > > +		sym_add_default(sym, "n");
>  > >  > > +
>  > >  > 
>  > >  > 		sym_set_tristate_value(sym, yes);
>  > >  > 	else
>  > >  > 		sym_set_tristate_value(sym, no);
>  > >  > 
>  > >  > should do the trick (untested).
>  > > 
>  > > Odd. What's the third state ? Undefined?
>  > no, mod, yes
>  > Representing: no, module, yes as the three config choices.
> 
> Now I'm even more puzzled.  Why would 'DEVEL_KERNEL' need
> to be modular ?
The same type is used to represent a boolean and a tristate
within kconfig:

typedef enum tristate {
	no, mod, yes
} tristate;

And in the cases where the config symbol is of type 'bool' then
the value 'mod' is not used.

	Sam
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