linux-kernel - Re: [RFC][PATCH 1/2] kconfig: Introduce KCONFIG(), KCONFIG_BUILTIN() and KCONFIG

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Date:	Wed, 27 Jul 2011 17:18:20 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Arnaud Lacombe <lacombar@...il.com>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	Américo Wang <xiyou.wangcong@...il.com>,
	linux-kbuild@...r.kernel.org, sam@...nborg.org,
	linux-kernel@...r.kernel.org, plagnioj@...osoft.com
Subject: Re: [RFC][PATCH 1/2] kconfig: Introduce KCONFIG(), KCONFIG_BUILTIN()
 and KCONFIG_MODULE()

On 27.7.2011 17:11, Arnaud Lacombe wrote:
> Hi,
>
> On Wed, Jul 27, 2011 at 9:38 AM, Michal Marek<mmarek@...e.cz>  wrote:
>>> [...]
>>> I'm good with the naming, but how would you define those ? I may have
>>> trouble to discern between IS_ENABLED() and IS_ENABLED_BUILTIN().
>>
>> IS_ENABLED() would mean not disabled, i.e. either 'y' or 'm'.
>> IS_ENABLED_BUILTIN() would mean 'y' and only 'y' and IS_ENABLED_MODULE()
>> would mean 'm'. For boolean options, IS_ENABLED() would be equivalent to
>> IS_ENABLED_BUILTIN() and IS_ENABLED_MODULE() would be always false.
>>
> how would IS_ENABLED() behave on CONFIG_FOO, with FOO being S_STRING
> or, say, S_HEX ?

It would fail to compile, because the helper macros are only defined for 
boolean and tristate symbols.

Michal
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