linux-kernel - Re: [BUILD FAILURE 11/12] Next April 21 : PPC64 randconfig [drivers/usb/host/ohci-hcd.o]

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Date:	Tue, 21 Apr 2009 20:00:37 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	David Brownell <david-b@...bell.net>
CC:	Kumar Gala <galak@...nel.crashing.org>, subrata@...ux.vnet.ibm.com,
	linux-usb@...r.kernel.org, Linuxppc-dev <Linuxppc-dev@...abs.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next <linux-next@...r.kernel.org>,
	sachinp <sachinp@...ux.vnet.ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alexander Beregalov <a.beregalov@...il.com>,
	samr <sam@...nborg.org>
Subject: Re: [BUILD FAILURE 11/12] Next April 21 : PPC64 randconfig [drivers/usb/host/ohci-hcd.o]

David Brownell wrote:
> On Tuesday 21 April 2009, Randy Dunlap wrote:
>>> Since its feasible to say 'n' to both we get the compile error.  How do
>>> we enforce having at least one set?
>> Looks like using "choice" without "optional" would do it.
>> See Documentation/kbuild/kconfig-language.txt and various examples
>> in Kconfig* files.
> 
> That won't quite work ... "at least one" includes "two"
> (i.e. a PCI card in little-endian, a native controller
> in big-endian).  Real-world systems need such configs,
> or so I'm told, and that's why their supported.

Yes, I see.

> Is there maybe a way to force Kconfig to just reject
> such illegal configs -- neither option set -- rather
> than trying some how to fix it?

Not that I know of.  cc-ing Sam.

> Or maybe ... if neither one is set, have the header
> force both on, and issue a warning.

That should be doable.  We'd prefer to catch it via Kconfig,
but that doesn't look promising just now.

-- 
~Randy
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