linux-kernel - Re: Linux 2.6.26-rc1

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Date:	Thu, 8 May 2008 09:48:20 -0300
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Alistair John Strachan <alistair@...zero.co.uk>,
	Robin Holt <holt@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.26-rc1

On Wed, 07 May 2008 01:36:09 +0200
Stefan Richter <stefanr@...6.in-berlin.de> wrote:

> Mauro Carvalho Chehab wrote:
> > On Tue, 06 May 2008 22:47:20 +0200
> > Stefan Richter <stefanr@...6.in-berlin.de> wrote:
> >> Or another idea:
> >>
> >> Copy _all_ dependencies of drivers which can be selected by "...if 
>     ^^^^
> >> VIDEO_HELPER_CHIPS_AUTO" to VIDEO_HELPER_CHIPS_AUTO.
> > 
> > I actually did this for tuners, on this changeset (still not at mainstream):
> > http://git.kernel.org/?p=linux/kernel/git/mchehab/v4l-dvb.git;a=commitdiff;h=d10b3c6817fb3fed8e6cd6d64d47c187a615c952
> 
> Yes...  Except that it is very dangerous to /move/ dependencies, as you 
> are apparently doing in that patch.  When you use "select" somewhere, 
> you should generally /copy/ dependencies.
> 
> Although something like
> 
> config VIRTUAL_META_OPTION
> 	depends on REAL_DEPENDENCY
> 
> config THE_REAL_THING
> 	depends on VIRTUAL_META_OPTION
> 
> does work if THE_REAL_THING actually depends on REAL_DEPENDENCY, it is 
> safer if this dependency stays there, i.e.
> 
> config THE_REAL_THING
> 	depends on REAL_DEPENDECY
> 
> or
> 
> config THE_REAL_THING
> 	depends on REAL_DEPENDENCY && VIRTUAL_META_OPTION
> 
> or whatever, or equivalent constructs involving "if"..."endif".
> 
> (I presume that for example MEDIA_TUNER_TDA827X does indeed have a build 
> dependency on DVB_CORE && I2C.)

No, the dependency of this file is currently wrong. In the case of those
tuners, all have the same dependencies: DVB or V4L and I2C. That's the reason
why I've removed the individual dependencies. Yet, two drivers need a select
(xc3028 and xc5000 needs to select FW_LOADER - so, only those two drivers are
also dependent of HOTPLUG).


Cheers,
Mauro
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