linux-kernel - Re: [PATCH 2/2] serial: 8250: fix building Ingenic with SERIAL

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Date:	Mon, 8 Feb 2016 11:45:44 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Matt Redfearn <matt.redfearn@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	Jiri Slaby <jslaby@...e.com>, <linux-serial@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] serial: 8250: fix building Ingenic with SERIAL_8250=m

[[PATCH 2/2] serial: 8250: fix building Ingenic with SERIAL_8250=m] On 08/02/2016 (Mon 13:51) Arnd Bergmann wrote:

> The Ingenic 8250 driver has a 'bool' Kconfig symbol, but that
> breaks when SERIAL_8250 is a loadable module:
> 
> drivers/tty/built-in.o: In function `ingenic_uart_probe':
> 8250_ingenic.c:(.text+0x1c1a0): undefined reference to `serial8250_register_8250_port'
> 
> This changes the symbol to a 'tristate', plus a dependency on

Note that Greg just queued a patch yesterday (but sent in 2015) that
removed what was the dead modular code.

It could also depend on SERIAL_8250=y to resolve the build issue you
found, if nobody cares about having modular SOC console UART drivers.

Either way, I don't have issue with it being tristate vs bool, but if
you do go with tristate, then my patch will have to be dropped/reverted.

Paul.
--

> SERIAL_8250, which makes it work again. Unlike the other
> soc-specific backends, this one has no dependency on an
> architecture or a platform. I'm adding a dependency on
> MIPS || COMPILE_TEST as well here, to avoid showing the driver
> on architectures that are not interested in it.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/tty/serial/8250/Kconfig | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
> index 6ae0fae4f796..13c63b14179f 100644
> --- a/drivers/tty/serial/8250/Kconfig
> +++ b/drivers/tty/serial/8250/Kconfig
> @@ -384,8 +384,8 @@ config SERIAL_8250_UNIPHIER
>  	  serial ports, say Y to this option. If unsure, say N.
>  
>  config SERIAL_8250_INGENIC
> -	bool "Support for Ingenic SoC serial ports"
> -	depends on OF_FLATTREE
> +	tristate "Support for Ingenic SoC serial ports"
> +	depends on SERIAL_8250 && OF_FLATTREE && (MIPS || COMPILE_TEST)
>  	select LIBFDT
>  	help
>  	  If you have a system using an Ingenic SoC and wish to make use of
> -- 
> 2.7.0
>