Surprising Kconfig depends semantics

[Adrian Bunk]

Hi Roman,

I traced some unresolved symbol problems in 2.6.0-test2-mm5 down to the 
following:

drivers/input/keyboard/Kconfig contains the following:

config KEYBOARD_ATKBD
        tristate "AT keyboard support" if EMBEDDED || !X86 
        default y
        depends on INPUT && INPUT_KEYBOARD && SERIO


The .config includes:
  # CONFIG_EMBEDDED is not set
  CONFIG_X86=y
  CONFIG_INPUT=y
  CONFIG_INPUT_KEYBOARD=y
  CONFIG_SERIO=m

Kconfig sets
  CONFIG_KEYBOARD_ATKBD=y

CONFIG_SERIO=m with CONFIG_KEYBOARD_ATKBD=y shouldn't be a valid 
combination.

The correct solution is most likely a
	default y if INPUT=y && INPUT_KEYBOARD=y && SERIO=y
	default m if INPUT!=n && INPUT_KEYBOARD!=n && SERIO!=n


The semantics that in

config FOO
	tristate
	default y if BAR

FOO will be set to y if BAR=m is a bit surprising.


cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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