Re: Kconfig entry defined multiple times

[gwr <gwr@free.fr>]

On 08/22/2012 10:05 AM, gwr wrote:
> Hello,
>
> I am working on kernel 2.6.32.38, and I see :
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> arch/x86/Kconfig, 202 :
> =============
>
> config USE_GENERIC_SMP_HELPERS
>     def_bool y
>     depends on SMP
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> arch/Kconfig, 112 :
> ===========
>
> config USE_GENERIC_SMP_HELPERS
>     bool
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Although we have this in Kconfig documentation,
> ================================================
> A config option can be defined multiple times with the same name, but 
> every
> definition can have only a single input prompt and the type must not 
> conflict.
> ================================================
>
> here,
>   - the first definition is a child of "Linux Kernel Configuration for 
> x86" MainMenu ( arch/x86/Kconfig, 1 )
>   - the second definition is a child of "General setup" Menu ( 
> init/Kconfig, 24 )
>
> So the hierarchy is different ; Can someone give explanations on this ?
>
> Thx
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I forgot the second half on my message :

- I am trying to build a linux kernel configurator that do not need to 
reparse
   all the kernel Kconfig input at each entry modification

- the problem :

   -- if I keep the 2 entries as separates objects, I cant choose 
between the 2 at
     expression evaluation time,because the second definition has no 
dependancy.

   -- the second definition has no dependancy => it suggest that the
     2 entries have to be joined into a single entry. But at which place 
in the hierarchy ?

( note  : a "make gconfig" ends up with 2 different 
USE_GENERIC_SMP_HELPERS entries in the tree )



Now consider the X86_EXTENDED_PLATFORM entry :

~~~~~~~~~~~~~~~~~~~~~~~~~~

arch/x86/Kconfig,312 :
=============

if X86_32
config X86_EXTENDED_PLATFORM
     bool "Support for extended (non-PC) x86 platforms"
     default y
     ---help---
( ...help text 1... )
endif

if X86_64
config X86_EXTENDED_PLATFORM
     bool "Support for extended (non-PC) x86 platforms"
     default y
     ---help---
( ...help text 2... )
endif

~~~~~~~~~~~~~~~~~~~~~~~~~~

the dependancies are mutually exclusive.




So in fact, the real question I ask is : could not be Kconfig grammar 
simplified, by adding some restricting rules ?

Thx