linux-kernel - Re: [patch] video: build fix for drivers/media/video/pvrusb2/

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Message-ID: <37219a840805110534r4865623y6f9510554e2716ac@mail.gmail.com>
Date:	Sun, 11 May 2008 08:34:06 -0400
From:	"Michael Krufky" <mkrufky@...uxtv.org>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	"Mauro Carvalho Chehab" <mchehab@...radead.org>,
	"Guennadi Liakhovetski" <g.liakhovetski@...gutronix.de>,
	"Mike Isely" <isely@...ox.com>
Subject: Re: [patch] video: build fix for drivers/media/video/pvrusb2/

On Sun, May 11, 2008 at 3:21 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> x86.git testing found the following build failure:
>
>  drivers/built-in.o: In function `pvr2_dvb_feed_thread':
>  pvrusb2-dvb.c:(.text+0x127e78): undefined reference to `dvb_dmx_swfilter'
>  drivers/built-in.o: In function `pvr2_dvb_adapter_exit':
>  pvrusb2-dvb.c:(.text+0x128357): undefined reference to `dvb_net_release'
>  pvrusb2-dvb.c:(.text+0x12836f): undefined reference to `dvb_dmxdev_release'
>  [...]
>
> with this config:
>
>  http://redhat.com/~mingo/misc/config-Sun_May_11_07_06_35_CEST_2008.bad
>
> the reason for the missing symbols is this combination:
>
>  CONFIG_VIDEO_PVRUSB2=y
>  CONFIG_DVB_CORE=m
>
> i.e. pvrusb2 is built-in, dvb-core is modular.
>
> This patch solves the problem by adding a dependency on DVB_CORE - this
> is used by other drivers such as au0828 as well. This way the pvrusb2
> driver can still be built, but if dvb-core is a module then it will
> correctly be a module as well and cannot be built-in.
>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  drivers/media/video/pvrusb2/Kconfig |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> Index: linux/drivers/media/video/pvrusb2/Kconfig
> ===================================================================
> --- linux.orig/drivers/media/video/pvrusb2/Kconfig
> +++ linux/drivers/media/video/pvrusb2/Kconfig
> @@ -1,6 +1,6 @@
>  config VIDEO_PVRUSB2
>        tristate "Hauppauge WinTV-PVR USB2 support"
> -       depends on VIDEO_V4L2 && I2C
> +       depends on VIDEO_V4L2 && I2C && DVB_CORE
>        select FW_LOADER
>        select MEDIA_TUNER
>        select VIDEO_TVEEPROM
>

Ingo,

VIDEO_PVRUSB2 should not depend on DVB_CORE unless VIDEO_PVRUSB2_DVB
is selected, which already depends on DVB_CORE.

For example, if a user has VIDEO_PVRUSB2_DVB not selected, then your
patch would generate a false dependency on DVB_CORE.

Regards,

Mike Krufky
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