linux-kernel - Re: [PATCH 2/8] Kconfig: unwanted menus for s390.

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Message-Id: <200704220232.10219.arnd@arndb.de>
Date:	Sun, 22 Apr 2007 02:32:09 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 2/8] Kconfig: unwanted menus for s390.

On Sunday 22 April 2007, Arnd Bergmann wrote:
> I would prefer to not have 'depends on !S390' but rather 'depends on MMIO',
> because that is what really drives stuff like IPMI: they expect the device
> to be reachable through the use of ioremap or inX/outX instructions, which
> don't exist on s390.
> 
> While it's unlikely that another architecture has the same restriction,
> it expresses much clearer what you mean.
> 
> In drivers/Kconfig, you can then simply add a
> 
> config MMIO
>         def_bool !S390

I just saw that we already have an option like that, with a slightly different
name.

arch/s390/Kconfig contains

config NO_IOMEM
	def_bool y

and lib/Kconfig contains

config HAS_IOMEM
	boolean
	depends on !NO_IOMEM
	default y

You should probably just use one of these two to disable any driver that
uses ioremap or similar.

	Arnd <><
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