linux-kernel - Re: Kconfig question - multiple entries touching one integer

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Message-ID: <20080704105407.GD24620@fluff.org.uk>
Date:	Fri, 4 Jul 2008 11:54:07 +0100
From:	Ben Dooks <ben-linux@...ff.org>
To:	Ben Dooks <ben-linux@...ff.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Kconfig question - multiple entries touching one integer

On Fri, Jul 04, 2008 at 11:08:29AM +0100, Ben Dooks wrote:
> I'm trying to produce a Kconfig to deal with allocating
> extra resources depending on what is selected. I'd like
> to have an integer which specifies the 
> 
> ie:
> 
> config ARCH_EXTRA_RESOURCES
> 	int
> 	default 0
> 	help
> 	  Extra resources depending on the board selected
> 
> ...
> 
> config BOARD_A
> 	set ARCH_EXTRA_RESOURCES 32
> 
> config BOARD_B
> 	set ARCH_EXTRA_RESOURCES 64
> 
> in this example, if board A is selected, then ARCH_EXTRA_RESOURCES
> would be 32, if BOARD_B is selected then it would be 64.
> 
> doing
> 
> 	config ARCH_EXTRA_RESOURCES
> 	int
> 	default 0
> 	default 32 if BOARD_A
> 	default 64 if BOARD_B
> 
> doesn't work, and involves changing this part of the Kconfig
> every time a new board is added.
> 
> Is there any current way of doing this, would there be any
> objections to having some form of 'set' clause in a config
> statememt?

Currently, the rather crufty approach is to do:

config ARCH_EXTRA_RESOURCES_32
	bool

config ARCH_EXTRA_RESOURCES_64
	bool

config BOARD_A
	select ARCH_EXTRA_RESOURCES_32

config BOARD_B
	select ARCH_EXTRA_RESOURCES_64

and have the following in the header file:

#ifdef ARCH_EXTRA_RESOURCES_64
#define ARCH_EXTRA_RESOURCES 64
#elif defined(ARCH_EXTRA_RESOURCES_32)
#define ARCH_EXTRA_RESOURCES 32
#else
#define ARCH_EXTRA_RESOURCES 0
#endif

-- 
Ben (ben@...ff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'
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