linux-kernel - Re: [PATCH] drm/ssd130x: Only define a SPI device ID table when built as a module

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Date:   Thu, 2 Jun 2022 00:38:18 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     kernel test robot <lkp@...el.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Mark Brown <broonie@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH] drm/ssd130x: Only define a SPI device ID table when built
 as a module

On 5/31/22 17:10, Nathan Chancellor wrote:
> On Mon, May 30, 2022 at 04:02:46PM +0200, Javier Martinez Canillas wrote:
>> The kernel test robot reports a compile warning due the ssd130x_spi_table
>> variable being defined but not used. This happen when ssd130x-spi driver
>> is built-in instead of being built as a module, i.e:
>>
>>   CC      drivers/gpu/drm/solomon/ssd130x-spi.o
>>   AR      drivers/base/firmware_loader/built-in.a
>>   AR      drivers/base/built-in.a
>>   CC      kernel/trace/trace.o
>> drivers/gpu/drm/solomon/ssd130x-spi.c:155:35: warning: ‘ssd130x_spi_table’ defined but not used [-Wunused-const-variable=]
>>   155 | static const struct spi_device_id ssd130x_spi_table[] = {
>>       |                                   ^~~~~~~~~~~~~~~~~
>>
>> The driver shouldn't need a SPI device ID table and only have an OF device
>> ID table, but the former is needed to workaround an issue in the SPI core.
>> This always reports a MODALIAS of the form "spi:<device>" even for devices
>> registered through Device Trees.
>>
>> But the table is only needed when the driver built as a module to populate
>> the .ko alias info. It's not needed when the driver is built-in the kernel.
>>
>> Fixes: 74373977d2ca ("drm/solomon: Add SSD130x OLED displays SPI support")
>> Reported-by: kernel test robot <lkp@...el.com>
>> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> 
> Reviewed-by: Nathan Chancellor <nathan@...nel.org>
> 
Thanks! Pushed this to drm-misc (drm-misc-next).

-- 
Best regards,

Javier Martinez Canillas
Linux Engineering
Red Hat