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kconfig: Introduce IS_ENABLED(), IS_BUILTIN() and IS_MODULE()

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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.

Reviewed-by: Arnaud Lacombe <lacombar@gmail.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Michal Marek 2011-07-20 17:38:57 +02:00
parent bac6aa865b
commit 2a11c8ea20
3 changed files with 47 additions and 58 deletions
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2
Makefile
View file

@ -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__

32
include/linux/kconfig.h Normal file
View file

@ -0,0 +1,32 @@
#ifndef __LINUX_KCONFIG_H
#define __LINUX_KCONFIG_H
#include <generated/autoconf.h>
/*
* Helper macros to use CONFIG_ options in C expressions. Note that
* these only work with boolean and tristate options.
*/
/*
* IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
* 0 otherwise.
*
*/
#define IS_ENABLED(option) \
(__enabled_ ## option || __enabled_ ## option ## _MODULE)
/*
* IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
* otherwise. For boolean options, this is equivalent to
* IS_ENABLED(CONFIG_FOO).
*/
#define IS_BUILTIN(option) __enabled_ ## option
/*
* IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0
* otherwise.
*/
#define IS_MODULE(option) __enabled_ ## option ## _MODULE
#endif /* __LINUX_KCONFIG_H */

71
scripts/kconfig/confdata.c
View file

@ -495,15 +495,25 @@ 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
* 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;
}
case S_HEX: {
@ -554,58 +564,6 @@ static struct conf_printer header_printer_cb =
.print_comment = header_print_comment,
};
/*
* Function-style header printer
*
* This printer is used to generate the config_is_xxx() function-style macros
* in `include/generated/autoconf.h'
*/
static void
header_function_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
{
int val = 0;
char c;
char *tmp, *d;
switch (sym->type) {
case S_BOOLEAN:
case S_TRISTATE:
break;
default:
return;
}
if (*value == 'm')
val = 2;
else if (*value == 'y')
val = 1;
d = strdup(CONFIG_);
tmp = d;
while ((c = *d)) {
*d = tolower(c);
d++;
}
fprintf(fp, "#define %sis_", tmp);
free(tmp);
d = strdup(sym->name);
tmp = d;
while ((c = *d)) {
*d = tolower(c);
d++;
}
fprintf(fp, "%s%s() %d\n", tmp, (val > 1) ? "_module" : "",
val ? 1 : 0);
free(tmp);
}
static struct conf_printer header_function_printer_cb =
{
.print_symbol = header_function_print_symbol,
};
/*
* Tristate printer
*
@ -997,7 +955,6 @@ int conf_write_autoconf(void)
conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
conf_write_symbol(out_h, sym, &header_function_printer_cb, NULL);
}
fclose(out);
fclose(tristate);