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Subject[PATCH] kconfig: Introduce IS_ENABLED(), IS_BUILTIN() and IS_MODULE()
Date
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@suse.cz>
---
Everybody happy with the above naming?

Michal

---
Makefile | 2 +-
include/linux/kconfig.h | 32 ++++++++++++++++++++
scripts/kconfig/confdata.c | 71 ++++++++-----------------------------------
3 files changed, 47 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..067eda0
--- /dev/null
+++ b/include/linux/kconfig.h
@@ -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 */
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index df629ec..59b667c 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -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: {
@@ -555,58 +565,6 @@ static struct conf_printer header_printer_cb =
};

/*
- * 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
*
* This printer is used when generating the `include/config/tristate.conf' file.
@@ -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);
--
1.7.6


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