diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index 08c05bcc82c9..f208f900ed3a 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -18,6 +18,7 @@
 
 static void conf(struct menu *menu);
 static void check_conf(struct menu *menu);
+static void xfgets(char *str, int size, FILE *in);
 
 enum input_mode {
 	oldaskconfig,
@@ -34,8 +35,6 @@ enum input_mode {
 	oldnoconfig,
 } input_mode = oldaskconfig;
 
-char *defconfig_file;
-
 static int indent = 1;
 static int valid_stdin = 1;
 static int sync_kconfig;
@@ -459,10 +458,30 @@ static struct option long_opts[] = {
 	{NULL, 0, NULL, 0}
 };
 
+static void conf_usage(const char *progname)
+{
+
+	printf("Usage: %s [option] <kconfig-file>\n", progname);
+	printf("[option] is _one_ of the following:\n");
+	printf("  --listnewconfig         List new options\n");
+	printf("  --oldaskconfig          Start a new configuration using a line-oriented program\n");
+	printf("  --oldconfig             Update a configuration using a provided .config as base\n");
+	printf("  --silentoldconfig       Same as oldconfig, but quietly, additionally update deps\n");
+	printf("  --oldnoconfig           Same as silentoldconfig but set new symbols to no\n");
+	printf("  --defconfig <file>      New config with default defined in <file>\n");
+	printf("  --savedefconfig <file>  Save the minimal current configuration to <file>\n");
+	printf("  --allnoconfig           New config where all options are answered with no\n");
+	printf("  --allyesconfig          New config where all options are answered with yes\n");
+	printf("  --allmodconfig          New config where all options are answered with mod\n");
+	printf("  --alldefconfig          New config with all symbols set to default\n");
+	printf("  --randconfig            New config with random answer to all options\n");
+}
+
 int main(int ac, char **av)
 {
+	const char *progname = av[0];
 	int opt;
-	const char *name;
+	const char *name, *defconfig_file = NULL /* gcc uninit */;
 	struct stat tmpstat;
 
 	setlocale(LC_ALL, "");
@@ -494,14 +513,24 @@ int main(int ac, char **av)
 			srand(seed);
 			break;
 		}
+		case oldaskconfig:
+		case oldconfig:
+		case allnoconfig:
+		case allyesconfig:
+		case allmodconfig:
+		case alldefconfig:
+		case listnewconfig:
+		case oldnoconfig:
+			break;
 		case '?':
-			fprintf(stderr, _("See README for usage info\n"));
+			conf_usage(progname);
 			exit(1);
 			break;
 		}
 	}
 	if (ac == optind) {
 		printf(_("%s: Kconfig file missing\n"), av[0]);
+		conf_usage(progname);
 		exit(1);
 	}
 	name = av[optind];
@@ -644,13 +673,11 @@ int main(int ac, char **av)
 	}
 	return 0;
 }
+
 /*
  * Helper function to facilitate fgets() by Jean Sacren.
  */
-void xfgets(str, size, in)
-	char *str;
-	int size;
-	FILE *in;
+void xfgets(char *str, int size, FILE *in)
 {
 	if (fgets(str, size, in) == NULL)
 		fprintf(stderr, "\nError in reading or end of file.\n");
diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c
index 792c62ed9d63..290ce41f8ba4 100644
--- a/scripts/kconfig/expr.c
+++ b/scripts/kconfig/expr.c
@@ -13,8 +13,7 @@
 
 struct expr *expr_alloc_symbol(struct symbol *sym)
 {
-	struct expr *e = malloc(sizeof(*e));
-	memset(e, 0, sizeof(*e));
+	struct expr *e = calloc(1, sizeof(*e));
 	e->type = E_SYMBOL;
 	e->left.sym = sym;
 	return e;
@@ -22,8 +21,7 @@ struct expr *expr_alloc_symbol(struct symbol *sym)
 
 struct expr *expr_alloc_one(enum expr_type type, struct expr *ce)
 {
-	struct expr *e = malloc(sizeof(*e));
-	memset(e, 0, sizeof(*e));
+	struct expr *e = calloc(1, sizeof(*e));
 	e->type = type;
 	e->left.expr = ce;
 	return e;
@@ -31,8 +29,7 @@ struct expr *expr_alloc_one(enum expr_type type, struct expr *ce)
 
 struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2)
 {
-	struct expr *e = malloc(sizeof(*e));
-	memset(e, 0, sizeof(*e));
+	struct expr *e = calloc(1, sizeof(*e));
 	e->type = type;
 	e->left.expr = e1;
 	e->right.expr = e2;
@@ -41,8 +38,7 @@ struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e
 
 struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2)
 {
-	struct expr *e = malloc(sizeof(*e));
-	memset(e, 0, sizeof(*e));
+	struct expr *e = calloc(1, sizeof(*e));
 	e->type = type;
 	e->left.sym = s1;
 	e->right.sym = s2;
diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index 306c5a59efc2..6fc894f358e4 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -76,9 +76,6 @@ void zconf_nextfile(const char *name);
 int zconf_lineno(void);
 const char *zconf_curname(void);
 
-/* conf.c */
-void xfgets(char *str, int size, FILE *in);
-
 /* confdata.c */
 const char *conf_get_configname(void);
 const char *conf_get_autoconfig_name(void);
@@ -99,9 +96,6 @@ static inline void xfwrite(const void *str, size_t len, size_t count, FILE *out)
 		fprintf(stderr, "\nError in writing or end of file.\n");
 }
 
-/* kconfig_load.c */
-void kconfig_load(void);
-
 /* menu.c */
 void _menu_init(void);
 void menu_warn(struct menu *menu, const char *fmt, ...);