linux-kernel - Re: [PATCH] media: rc: select CONFIG

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Date:   Tue, 19 Jan 2021 14:54:52 +0000
From:   Sean Young <sean@...s.org>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: rc: select CONFIG_BITREVERSE where needed

On Fri, Dec 04, 2020 at 12:17:03AM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> A number of remote control drivers require the bitreverse
> helper, and run into a link error when it is disabled:
> 
> arm-linux-gnueabi-ld: drivers/media/rc/img-ir/img-ir-nec.o: in function `img_ir_nec_scancode':
> img-ir-nec.c:(.text+0x10c): undefined reference to `byte_rev_table'
> arm-linux-gnueabi-ld: drivers/media/rc/img-ir/img-ir-nec.o: in function `img_ir_nec_filter':
> img-ir-nec.c:(.text+0x2dc): undefined reference to `byte_rev_table'
> arm-linux-gnueabi-ld: drivers/media/usb/cx231xx/cx231xx-input.o: in function `get_key_isdbt':
> cx231xx-input.c:(.text+0x38c): undefined reference to `byte_rev_table'
> arm-linux-gnueabi-ld: drivers/media/usb/em28xx/em28xx-input.o: in function `em28xx_get_key_em_haup':
> em28xx-input.c:(.text+0x1704): undefined reference to `byte_rev_table'
> 
Acked-by: Sean Young <sean@...s.org>

Thanks

Sean

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/media/rc/Kconfig          | 2 ++
>  drivers/media/rc/img-ir/Kconfig   | 1 +
>  drivers/media/usb/cx231xx/Kconfig | 1 +
>  drivers/media/usb/em28xx/Kconfig  | 1 +
>  4 files changed, 5 insertions(+)
> 
> diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
> index 2c0ee2e5b446..8a4b4040be45 100644
> --- a/drivers/media/rc/Kconfig
> +++ b/drivers/media/rc/Kconfig
> @@ -92,6 +92,7 @@ config IR_SONY_DECODER
>  config IR_SANYO_DECODER
>  	tristate "Enable IR raw decoder for the Sanyo protocol"
>  	depends on RC_CORE
> +	select BITREVERSE
>  
>  	help
>  	   Enable this option if you have an infrared remote control which
> @@ -101,6 +102,7 @@ config IR_SANYO_DECODER
>  config IR_SHARP_DECODER
>  	tristate "Enable IR raw decoder for the Sharp protocol"
>  	depends on RC_CORE
> +	select BITREVERSE
>  
>  	help
>  	   Enable this option if you have an infrared remote control which
> diff --git a/drivers/media/rc/img-ir/Kconfig b/drivers/media/rc/img-ir/Kconfig
> index 5c0508f2719f..a80cfcd87a95 100644
> --- a/drivers/media/rc/img-ir/Kconfig
> +++ b/drivers/media/rc/img-ir/Kconfig
> @@ -30,6 +30,7 @@ config IR_IMG_HW
>  config IR_IMG_NEC
>  	bool "NEC protocol support"
>  	depends on IR_IMG_HW
> +	select BITREVERSE
>  	help
>  	   Say Y here to enable support for the NEC, extended NEC, and 32-bit
>  	   NEC protocols in the ImgTec infrared decoder block.
> diff --git a/drivers/media/usb/cx231xx/Kconfig b/drivers/media/usb/cx231xx/Kconfig
> index 2fe2b2d335ba..b80661b8375f 100644
> --- a/drivers/media/usb/cx231xx/Kconfig
> +++ b/drivers/media/usb/cx231xx/Kconfig
> @@ -18,6 +18,7 @@ config VIDEO_CX231XX_RC
>  	bool "Conexant cx231xx Remote Controller additional support"
>  	depends on RC_CORE=y || RC_CORE=VIDEO_CX231XX
>  	depends on VIDEO_CX231XX
> +	select BITREVERSE
>  	default y
>  	help
>  	  cx231xx hardware has a builtin RX/TX support. However, a few
> diff --git a/drivers/media/usb/em28xx/Kconfig b/drivers/media/usb/em28xx/Kconfig
> index f2031a933e54..8a24731b373a 100644
> --- a/drivers/media/usb/em28xx/Kconfig
> +++ b/drivers/media/usb/em28xx/Kconfig
> @@ -77,5 +77,6 @@ config VIDEO_EM28XX_RC
>  	depends on VIDEO_EM28XX
>  	depends on !(RC_CORE=m && VIDEO_EM28XX=y)
>  	default VIDEO_EM28XX
> +	select BITREVERSE
>  	help
>  	  Enables Remote Controller support on em28xx driver.
> -- 
> 2.27.0