I've been using gcml2 from Greg Banks to look at CONFIG_

variable dependencies in config.in files.

By moving drivers/input/config.in before drivers/char/Config.in
and drivers/usb/Config.in for arch/alpha and arch/mips(64),
several (7) instances of this message:
  forward declared symbol "CONFIG_INPUT" used in dependency list
and (6) instances of this one:
  forward declared symbol "CONFIG_SOUND_GAMEPORT" used in
  dependency list
can be removed.  (Yes, the latter one is for OSS drivers,
so it's not so important.)
   
It also adds one forward dependency for a USB joystick
in the input subsystem [still only for alpha and mips(64)].
Most other arches are already like this.

arch/alpha/config.in

@@ -338,6 +338,7 @@ if [ "$CONFIG_CD_NO_IDESCSI" != "n" ]; then
 fi
 endmenu
 
+source drivers/input/Config.in
 source drivers/char/Config.in
 
 #source drivers/misc/Config.in
@@ -373,7 +374,6 @@ fi
 endmenu
 
 source drivers/usb/Config.in
-source drivers/input/Config.in
 
 source net/bluetooth/Config.in
 

arch/mips/config.in

@@ -389,6 +389,8 @@ if [ "$CONFIG_CD_NO_IDESCSI" != "n" ]; then
 fi
 endmenu
 
+source drivers/input/Config.in
+
 source drivers/char/Config.in
 
 source drivers/media/Config.in
@@ -474,7 +476,6 @@ if [ "$CONFIG_SGI_IP22" = "y" ]; then
 fi
 
 source drivers/usb/Config.in
-source drivers/input/Config.in
 
 mainmenu_option next_comment
 comment 'Kernel hacking'

arch/mips64/config.in

@@ -189,6 +189,8 @@ if [ "$CONFIG_CD_NO_IDESCSI" != "n" ]; then
 fi
 endmenu
 
+source drivers/input/Config.in
+
 source drivers/char/Config.in
 
 #source drivers/misc/Config.in
@@ -230,7 +232,6 @@ if [ "$CONFIG_SGI_IP22" = "y" ]; then
 fi
 
 source drivers/usb/Config.in
-source drivers/input/Config.in
 
 mainmenu_option next_comment
 comment 'Kernel hacking'