From: gwr <gwr@free.fr>
Cc: linux-config@vger.kernel.org
Subject: Re: Kconfig entry defined multiple times
Date: Wed, 22 Aug 2012 10:42:44 +0200 [thread overview]
Message-ID: <50349B84.4030400@free.fr> (raw)
In-Reply-To: <503492D8.9030109@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
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
next prev parent reply other threads:[~2012-08-22 8:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-22 8:05 Kconfig entry defined multiple times gwr
2012-08-22 8:42 ` gwr [this message]
2012-08-22 8:45 ` gwr
2012-08-22 8:59 ` gwr
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