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

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Date:	Wed, 27 Jul 2011 17:16:20 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Arnaud Lacombe <lacombar@...il.com>
Cc:	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 17:09, Arnaud Lacombe wrote:
> Hi,
>
> On Mon, Jul 25, 2011 at 6:58 PM, Michal Marek<mmarek@...e.cz>  wrote:
>> Replace the config_is_*() macros with a variant that allows for grepping
>> for usage of CONFIG_* options in the code. Usage:
>>
>>   if (KCONFIG(CONFIG_NUMA))
>>
>> or
>>
>>   #if KCONFIG(CONFIG_NUMA)
>>
>> The KCONFIG() macro evaluates to 1 if the argument is set (to either 'y'
>> or 'm'), KCONFIG_BUILTIN() and KCONFIG_MODULE() test if the respective
>> option is 'y' and 'm', respectively.
>>
>> Signed-off-by: Michal Marek<mmarek@...e.cz>
>> ---
>>   Makefile                   |    2 +-
>>   include/linux/kconfig.h    |   24 +++++++++++++++
>>   scripts/kconfig/confdata.c |   70 ++++++++-----------------------------------
>>   3 files changed, 38 insertions(+), 58 deletions(-)
>>   create mode 100644 include/linux/kconfig.h
>>
>> diff --git a/Makefile b/Makefile
>> index afb8e0d..bd7629b 100644
>> --- a/Makefile
>> +++ b/Makefile
>> @@ -360,7 +360,7 @@ CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
>>   LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include \
>>                     -Iarch/$(hdr-arch)/include/generated -Iinclude \
>>                     $(if $(KBUILD_SRC), -I$(srctree)/include) \
>> -                   -include include/generated/autoconf.h
>> +                   -include $(srctree)/include/linux/kconfig.h
>>
>>   KBUILD_CPPFLAGS := -D__KERNEL__
>>
>> diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h
>> new file mode 100644
>> index 0000000..fe80348
>> --- /dev/null
>> +++ b/include/linux/kconfig.h
>> @@ -0,0 +1,24 @@
>> +#ifndef __LINUX_KCONFIG_H
>> +#define __LINUX_KCONFIG_H
>> +
>> +#include<generated/autoconf.h>
>> +
>> +/*
>> + * Evaluates to 1 if CONFIG_option is set to 'y', 0 otherwise
>> + */
>> +#define KCONFIG_BUILTIN(option) __enabled_ ## option
>> +
>> +/*
>> + * Evaluates to 1 if CONFIG_option is set to 'm', 0 otherwise
>> + */
>> +#define KCONFIG_MODULE(option) __enabled_ ## option ## _MODULE
>> +
>> +/*
>> + * Evaluates to 1 if CONFIG_option is set to 'y' or 'm', 0 otherwise
>> + *
>> + */
>> +#define KCONFIG(option) \
>> +       (__enabled_ ## option || __enabled_ ## option ## _MODULE)
>> +
>> +
>> +#endif /* __LINUX_KCONFIG_H */
>> diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
>> index df629ec..3bab40a 100644
>> --- a/scripts/kconfig/confdata.c
>> +++ b/scripts/kconfig/confdata.c
>> @@ -495,15 +495,24 @@ header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
>>
>>                 switch (*value) {
>>                 case 'n':
>> -                       return;
>> +                       break;
>>                 case 'm':
>>                         suffix = "_MODULE";
>>                         /* fall through */
>>                 default:
>> -                       value = "1";
>> +                       fprintf(fp, "#define %s%s%s 1\n",
>> +                           CONFIG_, sym->name, suffix);
>>                 }
>> -               fprintf(fp, "#define %s%s%s %s\n",
>> -                   CONFIG_, sym->name, suffix, value);
>> +               /*
>> +                * Generate the __enabled_CONFIG_* and
>> +                * __enabled_CONFIG_*_MODULE macros for use by the KCONFIG*()
>> +                * macros. The _MODULE variant is generated even for booleans
>> +                * so that the KCONFIG() 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;
>>         }
>>         case S_HEX: {
> Just to comment on the patch itself, it will certainly not apply
> against kbuild/kconfig as I changed header_print_symbol() to fix the
> S_HEX prefix issue.

If course it applies, the "case S_HEX: {" context line you are quoting 
was added by your commit: 
http://git.kernel.org/?p=linux/kernel/git/mmarek/kbuild-2.6.git;a=commitdiff;h=eb4cf5a642f6430cffff7ba5d8d9bd46ea409281

Michal
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