linux-kernel - Re: [patch] drivers/media/video build fix for certain modular builds

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Date:	Fri, 16 May 2008 13:19:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] drivers/media/video build fix for certain modular
	builds


* Sam Ravnborg <sam@...nborg.org> wrote:

> On Fri, May 16, 2008 at 09:10:29AM +0200, Ingo Molnar wrote:
> > 
> > testing of the -tip tree found the following missing symbols build bug:
> > 
> >     LD      init/built-in.o
> >     LD      .tmp_vmlinux1
> >     drivers/built-in.o: In function `vidioc_g_ctrl':
> >     radio-maxiradio.c:(.text+0xd3337): undefined reference to `video_devdata'
> >     drivers/built-in.o: In function `vidioc_g_frequency':
> >     radio-maxiradio.c:(.text+0xd3368): undefined reference to `video_devdata'
> >     drivers/built-in.o: In function `vidioc_s_ctrl':
> >     [...]
> > 
> > which happens if certain media drivers are modular:
> > 
> >     http://redhat.com/~mingo/misc/config-Thu_May_15_18_10_27_CEST_2008.bad
> > 
> > the problem is:
> > 
> >     CONFIG_VIDEO_MEDIA=m
> >     CONFIG_VIDEO_DEV=y
> >     CONFIG_RADIO_MAXIRADIO=y
> >     CONFIG_VIDEO_V4L2=y
> > 
> > Connecting the build dependencies tree from drivers/media/ to 
> > drivers/media/video/ allows the built-in drivers(s) to pick up the 
> > CONFIG_VIDEO_DEV=y symbols.
> > 
> > ---
> >  drivers/media/Makefile |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > Index: linux/drivers/media/Makefile
> > ===================================================================
> > --- linux.orig/drivers/media/Makefile
> > +++ linux/drivers/media/Makefile
> > @@ -2,7 +2,7 @@
> >  # Makefile for the kernel multimedia device drivers.
> >  #
> >  
> > -obj-y := common/
> > +obj-y := common/ video/
> >  
> >  obj-$(CONFIG_VIDEO_MEDIA) += common/
> >  
> 
> Adrian just posted a similar fix that I like better because it
> cleans up the Makefile a bit.
> The obj-$(CONFIG_VIDEO_MEDIA) += common/ assignment in the
> above is for example now redundant.
> 
> But otherwise obviously correct.

sure enough, i went for the minimal fix. Adrian's patch looks good too.

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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