[PATCH] config: update usage/help info

Replace outdated help message with a reference to README.  Update README
for make *config variants and environment variable info.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 24 insertions, 2 deletions

diff --git a/README b/README
index 05e055530bbb..3e264723b863 100644
--- a/README
+++ b/README
@@ -165,10 +165,31 @@ CONFIGURING the kernel:
         "make xconfig"     X windows (Qt) based configuration tool.
         "make gconfig"     X windows (Gtk) based configuration tool.
         "make oldconfig"   Default all questions based on the contents of
-                           your existing ./.config file.
+                           your existing ./.config file and asking about
+                           new config symbols.
         "make silentoldconfig"
                            Like above, but avoids cluttering the screen
                            with questions already answered.
+        "make defconfig"   Create a ./.config file by using the default
+                           symbol values from arch/$ARCH/defconfig.
+        "make allyesconfig"
+                           Create a ./.config file by setting symbol
+                           values to 'y' as much as possible.
+        "make allmodconfig"
+                           Create a ./.config file by setting symbol
+                           values to 'm' as much as possible.
+        "make allnoconfig" Create a ./.config file by setting symbol
+                           values to 'n' as much as possible.
+        "make randconfig"  Create a ./.config file by setting symbol
+                           values to random values.
+
+   The allyesconfig/allmodconfig/allnoconfig/randconfig variants can
+   also use the environment variable KCONFIG_ALLCONFIG to specify a
+   filename that contains config options that the user requires to be
+   set to a specific value.  If KCONFIG_ALLCONFIG=filename is not used,
+   "make *config" checks for a file named "all{yes/mod/no/random}.config"
+   for symbol values that are to be forced.  If this file is not found,
+   it checks for a file named "all.config" to contain forced values.
    
         NOTES on "make config":
         - having unnecessary drivers will make the kernel bigger, and can
diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index ae5ab981bb1d..8012d1076876 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -5,6 +5,7 @@
 
 #include <ctype.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #include <time.h>
@@ -531,7 +532,7 @@ int main(int ac, char **av)
                         break;
                 case 'h':
                 case '?':
-                        printf("%s [-o|-s] config\n", av[0]);
+                        fprintf(stderr, "See README for usage info\n");
                         exit(0);
                 }
         }