linux-kernel - Re: [PATCH] kconfig: Introduce IS_ENABLED(), IS_BUILTIN() and IS

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Message-Id: <20110729112526.db528361.rdunlap@xenotime.net>
Date:	Fri, 29 Jul 2011 11:25:26 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Michal Marek <mmarek@...e.cz>
Cc:	linux-kbuild@...r.kernel.org, xiyou.wangcong@...il.com,
	lacombar@...il.com, sam@...nborg.org, linux-kernel@...r.kernel.org,
	plagnioj@...osoft.com
Subject: Re: [PATCH] kconfig: Introduce IS_ENABLED(), IS_BUILTIN() and
 IS_MODULE()

On Fri, 29 Jul 2011 15:51:37 +0200 Michal Marek wrote:

> Replace the config_is_*() macros with a variant that allows for grepping
> for usage of CONFIG_* options in the code. Usage:
> 
>   if (IS_ENABLED(CONFIG_NUMA))
> 
> or
> 
>   #if IS_ENABLED(CONFIG_NUMA)
> 
> The IS_ENABLED() macro evaluates to 1 if the argument is set (to either 'y'
> or 'm'), IS_BUILTIN() tests if the option is 'y' and IS_MODULE() test if
> the option is 'm'. Only boolean and tristate options are supported.
> 
> Signed-off-by: Michal Marek <mmarek@...e.cz>
> ---
> 
> Everybody happy with the above naming?

Yes here.

Acked-by: Randy Dunlap <rdunlap@...otime.net>

These strings are being written to the .config file, right?

> +		/*
> +		 * Generate the __enabled_CONFIG_* and
> +		 * __enabled_CONFIG_*_MODULE macros for use by the
> +		 * IS_{ENABLED,BUILTIN,MODULE} macros. The _MODULE variant is
> +		 * generated even for booleans so that the IS_ENABLED() macro
> +		 * works.
> +		 */
> +		fprintf(fp, "#define __enabled_" CONFIG_ "%s %d\n",
> +				sym->name, (*value == 'y'));
> +		fprintf(fp, "#define __enabled_" CONFIG_ "%s_MODULE %d\n",
> +				sym->name, (*value == 'm'));
>  		break;


---
~Randy
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