1 files changed, 35 insertions, 8 deletions

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");