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
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
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