linux-kernel - Re: [PATCH v2 5/6] serial: 8250/mediatek: fix building with SERIAL

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Message-ID: <CAK7LNAS5oNd8hdjS6+mYoPhNVTaGzAjc4SvnSmP1f_pDeHTFDg@mail.gmail.com>
Date:	Fri, 12 Feb 2016 18:43:05 +0900
From:	Masahiro Yamada <yamada.masahiro@...ionext.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-serial@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jslaby@...e.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Eddie Huang <eddie.huang@...iatek.com>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2 5/6] serial: 8250/mediatek: fix building with SERIAL_8250=m

Hi Arnd,


2016-02-12 0:41 GMT+09:00 Arnd Bergmann <arnd@...db.de>:
> The Mediatek 8250 driver has a 'bool' Kconfig symbol, but that
> breaks when SERIAL_8250 is a loadable module:
>
> drivers/tty/built-in.o: In function `mtk8250_set_termios':
> :(.text+0x1bee8): undefined reference to `serial8250_do_set_termios'
> :(.text+0x1bf10): undefined reference to `uart_get_baud_rate'
> :(.text+0x1c09c): undefined reference to `uart_get_divisor'
> drivers/tty/built-in.o: In function `mtk8250_do_pm':
> :(.text+0x1c0d0): undefined reference to `serial8250_do_pm'
> drivers/tty/built-in.o: In function `mtk8250_probe':
> :(.text+0x1c2e4): undefined reference to `serial8250_register_8250_port'
> serial/8250/8250_mtk.c:287:242: error: data definition has no type or storage class [-Werror]
> serial/8250/8250_mtk.c:287:122: error: 'mtk8250_platform_driver_init' defined but not used [-Werror=unused-function]
>
> This changes the symbol to a 'tristate', so the dependency on
> SERIAL_8250 also works when that is set to 'm'.
> To actually build the driver, we also need to include <linux/module.h>.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/tty/serial/8250/8250_mtk.c | 3 ++-
>  drivers/tty/serial/8250/Kconfig    | 2 +-
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
> index 6ecc6e3e82dc..55be90c1d85e 100644
> --- a/drivers/tty/serial/8250/8250_mtk.c
> +++ b/drivers/tty/serial/8250/8250_mtk.c
> @@ -19,6 +19,7 @@
>  #include <linux/module.h>
>  #include <linux/of_irq.h>
>  #include <linux/of_platform.h>
> +#include <linux/module.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/serial_8250.h>
> @@ -303,7 +304,7 @@ static struct platform_driver mtk8250_platform_driver = {
>  };
>  module_platform_driver(mtk8250_platform_driver);
>
> -#ifdef CONFIG_SERIAL_8250_CONSOLE
> +#if defined(CONFIG_SERIAL_8250_CONSOLE) && !defined(MODULE)
>  static int __init early_mtk8250_setup(struct earlycon_device *device,
>                                         const char *options)
>  {


As mentioned in 4/6, this hunk might become unneeded if
https://patchwork.kernel.org/patch/8289231/
is accepted.



-- 
Best Regards
Masahiro Yamada