linux-kernel - Re: [PATCH] media: rcar_drif: select CONFIG_V4L2

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Message-ID: <YPg9n3QsD/I7ciQS@oden.dyn.berto.se>
Date:   Wed, 21 Jul 2021 17:30:39 +0200
From:   Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        geert+renesas@...der.be, prabhakar.mahadev-lad.rj@...renesas.com,
        Arnd Bergmann <arnd@...db.de>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Alexandre Courbot <acourbot@...omium.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: rcar_drif: select CONFIG_V4L2_ASYNC

Hi Arnd,

On 2021-07-21 17:24:59 +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Without this, I see a randconfig link failure:
> 
> aarch64-linux-ld: drivers/media/platform/rcar_drif.o: in function `rcar_drif_remove':
> rcar_drif.c:(.text+0x2a8): undefined reference to `v4l2_async_notifier_unregister'
> aarch64-linux-ld: rcar_drif.c:(.text+0x2b0): undefined reference to `v4l2_async_notifier_cleanup'
> aarch64-linux-ld: drivers/media/platform/rcar_drif.o: in function `rcar_drif_sdr_probe':
> rcar_drif.c:(.text+0x1444): undefined reference to `v4l2_async_notifier_init'
> aarch64-linux-ld: rcar_drif.c:(.text+0x14a0): undefined reference to `v4l2_async_notifier_register'
> aarch64-linux-ld: rcar_drif.c:(.text+0x14d8): undefined reference to `v4l2_async_notifier_cleanup'
> aarch64-linux-ld: rcar_drif.c:(.text+0x15a8): undefined reference to `__v4l2_async_notifier_add_fwnode_subdev'
> 
> I could not easily figure out when this was introduced, as this code
> has not changed in a while but I only saw the problem recently.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

> ---
>  drivers/media/platform/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index 157c924686e4..c5d1c83bd582 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -635,6 +635,7 @@ config VIDEO_RCAR_DRIF
>  	depends on VIDEO_V4L2
>  	depends on ARCH_RENESAS || COMPILE_TEST
>  	select VIDEOBUF2_VMALLOC
> +	select V4L2_ASYNC
>  	help
>  	  Say Y if you want to enable R-Car Gen3 DRIF support. DRIF is Digital
>  	  Radio Interface that interfaces with an RF front end chip. It is a
> -- 
> 2.29.2
> 

-- 
Regards,
Niklas Söderlund