linux-kernel - Re: [PATCH] media: vivid: drop CONFIG

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Date:   Wed, 4 Aug 2021 16:18:45 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Guillaume Tucker <guillaume.tucker@...labora.com>,
        kernel test robot <lkp@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCH] media: vivid: drop CONFIG_FB dependency

Hi Guillaume,

On 30/07/2021 16:26, Guillaume Tucker wrote:
> On 30/07/2021 14:32, kernel test robot wrote:
>> Hi Guillaume,
>>
>> Thank you for the patch! Yet something to improve:
>>
>> [auto build test ERROR on linuxtv-media/master]
>> [also build test ERROR on v5.14-rc3 next-20210729]
>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>> And when submitting patch, we suggest to use '--base' as documented in
>> https://git-scm.com/docs/git-format-patch]
>>
>> url:    https://github.com/0day-ci/linux/commits/Guillaume-Tucker/media-vivid-drop-CONFIG_FB-dependency/20210729-191815
>> base:   git://linuxtv.org/media_tree.git master
>> config: m68k-allmodconfig (attached as .config)
>> compiler: m68k-linux-gcc (GCC) 10.3.0
>> reproduce (this is a W=1 build):
>>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>         chmod +x ~/bin/make.cross
>>         # https://github.com/0day-ci/linux/commit/51defc67cada10450046e4d4e7eda1a2573371cc
>>         git remote add linux-review https://github.com/0day-ci/linux
>>         git fetch --no-tags linux-review Guillaume-Tucker/media-vivid-drop-CONFIG_FB-dependency/20210729-191815
>>         git checkout 51defc67cada10450046e4d4e7eda1a2573371cc
>>         # save the attached .config to linux build tree
>>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=m68k 
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All errors (new ones prefixed by >>, old ones prefixed by <<):
>>
>>>> ERROR: modpost: "vivid_clear_fb" [drivers/media/test-drivers/vivid/vivid.ko] undefined!
>>>> ERROR: modpost: "vivid_fb_release_buffers" [drivers/media/test-drivers/vivid/vivid.ko] undefined!
>>>> ERROR: modpost: "vivid_fb_init" [drivers/media/test-drivers/vivid/vivid.ko] undefined!
> 
> Pretty sure this is due to the conditional in the Makefile I
> mentioned in an email yesterday, where it should have been
> ifneq ($(CONFIG_FB),) for when CONFIG_FB=m.
> 
> Let me know if I should send a v2 now with this fix, I was
> waiting for Hans' feedback first.

Go ahead and send a v2.

I have just one comment: in vivid-core.c, please change this in the node_types
MODULE_PARM_DESC:

                             "\t\t    bit 12: Radio Transmitter node\n"
                             "\t\t    bit 16: Framebuffer for testing overlays\n"
                             "\t\t    bit 17: Metadata Capture node\n"

to:

                             "\t\t    bit 12: Radio Transmitter node\n"
#ifdef CONFIG_FB
                             "\t\t    bit 16: Framebuffer for testing overlays\n"
#endif
                             "\t\t    bit 17: Metadata Capture node\n"

That way it is visible with modinfo whether or not framebuffer support is
compiled in or not.

Regards,

	Hans

> 
> Thanks,
> Guillaume
>