Re: Linux 2.6.15-rc2

[Michael Krufky <mkrufky@m1k.net>]

Adrian Bunk wrote:

> On Tue, Nov 22, 2005 at 11:36:48PM -0500, Gene Heskett wrote:
>  
>
> > ...
> > Well, I just went thru it again, and turned off everything but the
> > cx8800 and ORv51132 stuffs, and now I get this at the and of the
> > 'makeit' script I use here:
> >
> > WARNING:
> > /lib/modules/2.6.15-rc2/kernel/drivers/media/video/cx88/cx88-dvb.ko
> > needs unknown symbol mt352_attach
> > WARNING:
> > /lib/modules/2.6.15-rc2/kernel/drivers/media/video/cx88/cx88-dvb.ko
> > needs unknown symbol nxt200x_attach
> > WARNING:
> > /lib/modules/2.6.15-rc2/kernel/drivers/media/video/cx88/cx88-dvb.ko
> > needs unknown symbol mt352_write
> > WARNING:
> > /lib/modules/2.6.15-rc2/kernel/drivers/media/video/cx88/cx88-dvb.ko
> > needs unknown symbol lgdt330x_attach
> > WARNING:
> > /lib/modules/2.6.15-rc2/kernel/drivers/media/video/cx88/cx88-dvb.ko
> > needs unknown symbol cx22702_attach
> > ...
> >    
> Nice catch and thanks for your report.
>
> The bug is obvious. A possible patch is below (and at least 
> drivers/media/video/saa7134/Makefile contains the same bug),
> but I'd really prfer getting rid of the -DHAVE_* stuff in the
> Makefiles and using Kconfig variables instead.
>  
We need to keep the -DHAVE_FOO stuff there, in order to satisfy the 
following requirements:

1) To allow the option of only selecting those frontends required by 
specific dvb hardware, without forcing all modules to be loaded... This 
feature is optional, and I implemented it in response to the demand from 
some hybrid v4l/dvb device users, (and myself)  Why force a driver to 
load every frontend module if it isnt required by the hardware? -- 
apparantly the implementation was less than perfect.  I had originally 
intended for this to live in -mm for a bit, but when the merge window 
came around, Mauro had sent it upstream before I had the chance to 
create alternate patches for linus' tree.

2) (more importantly) To allow v4l-kernel cvs to retain backwards 
compatability with older kernels..

I had originally tried to rename these to use the Kconfig variables, but 
LKML people asked for it to be changed back.

Please do not remove this feature -- if it is broken, then we should try 
to fix it, rather than remove it.  If the specific frontend selection 
isn't working, then I guess we can revert back to the old behavior where 
every frontend is forced, but I would rather not.

> Would such a patch be accepted?
>
> > Cheers, Gene
> >    
> cu
> Adrian
>  
If it fixes Gene's problem (a quick glance at his emails suggests that 
it does) then:

Acked-by: Michael Krufky <mkrufky@linuxtv.org>

although Sam Ravnborg's suggestion looks better to me.  Unfortunately, I 
will be unable to test this out on my system until After Thanksgiving 
(on Friday) ...

> BTW: Please don't strip the Cc whenreplying to linux-kernel.
>
>
> --- linux-2.6.15-rc2/drivers/media/video/cx88/Makefile.old	2005-11-23 18:34:07.000000000 +0100
> +++ linux-2.6.15-rc2/drivers/media/video/cx88/Makefile	2005-11-23 18:34:18.000000000 +0100
> @@ -9,21 +9,21 @@
> EXTRA_CFLAGS += -I$(src)/..
> EXTRA_CFLAGS += -I$(srctree)/drivers/media/dvb/dvb-core
> EXTRA_CFLAGS += -I$(srctree)/drivers/media/dvb/frontends
> -ifneq ($(CONFIG_VIDEO_BUF_DVB),n)
> +ifneq ($(CONFIG_VIDEO_BUF_DVB),)
>  EXTRA_CFLAGS += -DHAVE_VIDEO_BUF_DVB=1
> endif
> -ifneq ($(CONFIG_DVB_CX22702),n)
> +ifneq ($(CONFIG_DVB_CX22702),)
>  EXTRA_CFLAGS += -DHAVE_CX22702=1
> endif
> -ifneq ($(CONFIG_DVB_OR51132),n)
> +ifneq ($(CONFIG_DVB_OR51132),)
>  EXTRA_CFLAGS += -DHAVE_OR51132=1
> endif
> -ifneq ($(CONFIG_DVB_LGDT330X),n)
> +ifneq ($(CONFIG_DVB_LGDT330X),)
>  EXTRA_CFLAGS += -DHAVE_LGDT330X=1
> endif
> -ifneq ($(CONFIG_DVB_MT352),n)
> +ifneq ($(CONFIG_DVB_MT352),)
>  EXTRA_CFLAGS += -DHAVE_MT352=1
> endif
> -ifneq ($(CONFIG_DVB_NXT200X),n)
> +ifneq ($(CONFIG_DVB_NXT200X),)
>  EXTRA_CFLAGS += -DHAVE_NXT200X=1
> endif
> -
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--
Michael Krufky


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