linux-kernel - Re: [build bug, 2.6.24-rc1] CONFIG_VIDEO_DEV=m & CONFIG_VIDEO_SAA7146

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Message-Id: <20071029111906.c488393f.randy.dunlap@oracle.com>
Date:	Mon, 29 Oct 2007 11:19:06 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Johannes Stezenbach <js@...uxtv.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [build bug, 2.6.24-rc1] CONFIG_VIDEO_DEV=m &
 CONFIG_VIDEO_SAA7146_VV=y

On Mon, 29 Oct 2007 13:35:33 +0100 Johannes Stezenbach wrote:

> On Mon, Oct 29, 2007, Ingo Molnar wrote:
> > * Randy Dunlap <randy.dunlap@...cle.com> wrote:
> > 
> > > > config VIDEO_SAA7146_VV
> > > > 	tristate
> > > > 	depends on VIDEO_DEV = y || VIDEO_DEV = VIDEO_SAA7146_VV
> > > > 	select VIDEOBUF_DMA_SG
> > > > 	select VIDEO_SAA7146
> > > > 
> > > > (untested)
> > > 
> > > Nope, won't work.  I tried that last night.  VIDEO_DEV_SAA7146_VV
> > > has too many "select"s involved, but select doesn't follow the dependency
> > > chains.  IOW, as written in Documentation/kbuild/kconfig-language.txt:
> > > 
> > > 	select is evil.... select will by brute force set a symbol
> > > 	equal to 'y' without visiting the dependencies. So abusing
> > > 	select you are able to select a symbol FOO even if FOO depends
> > > 	on BAR that is not set.
> > 
> > so ... what should we do? Remove those ~7 select VIDEO_SAA7146_VV lines 
> > and replace them with depends on VIDEO_SAA7146_VV ?
> 
> Hm, the idea is that the SAA7146 driver is like a library,
> and the V4L or DVB card drivers select the library functions
> they need (base driver or common V4L helper functions).
> The user shouldn't have to worry about those details.
> 
> But yeah, if it's not possible to do that with kbuild then
> it's probably best to s/select/depends on/ for VIDEO_SAA7146_VV
> and provide a meaningful help text for VIDEO_SAA7146_VV.

I don't have a better suggestion, but VIDEO_SAA7146_VV will need
a prompt and help text if a user can enable/disable it.

---
~Randy
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