linux-kernel - Re: [PATCH] apple-gmux: Fix kconfig dependencies

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Date:	Mon, 23 Jul 2012 11:08:29 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	Matthew Garrett <mjg@...hat.com>,
	platform-driver-x86@...r.kernel.org,
	Arun Raghavan <arun.raghavan@...labora.co.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] apple-gmux: Fix kconfig dependencies

On Mon, Jul 23, 2012 at 08:28:05AM -0700, Randy Dunlap wrote:
> On 07/23/2012 06:44 AM, Seth Forshee wrote:
> 
> > On Mon, Jul 23, 2012 at 02:30:10PM +0100, Matthew Garrett wrote:
> >>> I'm looking at Andreas's code for switcharoo support, and something I
> >>> want to do along with it is make apple-gmux not dependent on backlight
> >>> support (i.e. you can still build switcharoo support if
> >>> BACKLIGHT_CLASS_DEVICE is disabled). I'm assuming this patch as a
> >>> prerequisite. But things do get really monstrously ugly, so if there's a
> >>> cleaner way to enforce this that I haven't found I'd love to hear about
> >>> it.
> >>
> >> Why do you want to support that case? One of the problems we have with 
> >> the kernel at present is that it's trivial to come up with non-sensical 
> >> configurations. I can't think of a single case where you'd want the gmux 
> >> support without also having the backlight support code.
> > 
> > Just because there isn't strictly any reason that the switching code
> > needs to depend on backlight support. But yes, I can't think of a good
> > reason why anyone would want this configuration. I won't mess with it
> > then.
> 
> 
> then it should be required in Kconfig file(s), not left to
> create build errors.

Of course. There are some build errors right now under certain
configurations with apple-gmux. That's a bug, and the patch I sent fixes
it. I'll test the patches that add switcheroo support for build failures
under relevant configurations, but I'm not expecting any new problems
since vga_switcheroo provides stubs when it's disabled.

Seth

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