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

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>

3 files changed, 47 insertions, 58 deletions

diff --git a/Makefile b/Makefile
index afb8e0d26f2c..bd7629bb93da 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 000000000000..067eda0e4b32
--- /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 df629ecb4fdf..59b667cae5f3 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);