Re: [PATCH] tty/serial: make early console depend on SERIAL_CORE=y
From: Paul Gortmaker
Date: Mon Oct 19 2015 - 15:11:29 EST
[Re: [PATCH] tty/serial: make early console depend on SERIAL_CORE=y] On 19/10/2015 (Mon 14:56) Arnd Bergmann wrote:
> On Sunday 18 October 2015 18:06:48 Paul Gortmaker wrote:
> > On an powerpc allmodconfig build, the following is seen:
> >
> > paul@builder:~/git/linux-head$ make O=../ppc-build -j30 > /dev/null
> > drivers/built-in.o: In function `.setup_earlycon':
> > (.init.text+0x5b00): undefined reference to `.uart_parse_earlycon'
> > make[1]: *** [vmlinux] Error 1
> >
> > Since uart_parse_earlycon lives in serial_core.c we need to ensure
> > it is built in if early console is to be used.
>
> I saw the same thing and came up with a different fix
>
> > Cc: Arnd Bergmann <arnd@xxxxxxxx>
> > Cc: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> > Cc: Jiri Slaby <jslaby@xxxxxxxx>
> > Cc: linux-serial@xxxxxxxxxxxxxxx
> > Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
> > ---
> >
> > [A google shows this cropped up in April of this year; I guess it wasn't
> > completely fixed?
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2015-April/336954.html
> > FWIW, I was testing on tty/tty-testing pulled today, from Greg ]
>
> The new problem was clearly caused by 1d59b382f1c4 ("serial: fsl_lpuart:
> add earlycon support"), which selects SERIAL_EARLYCON but not
> SERIAL_CORE_CONSOLE.
>
> However, the way I read Peter's patch from the URL you provided,
> it seems that it is supposed to work without my patch, so I'm not
> sure.
>
> Arnd
>
> From 8b8704525b47ba3287de2d7ff89a53e3e335f9d8 Mon Sep 17 00:00:00 2001
> From: Arnd Bergmann <arnd@xxxxxxxx>
> Date: Mon, 19 Oct 2015 13:02:08 +0200
> Subject: [PATCH] serial: fsl-lpuart: select SERIAL_CORE_CONSOLE
>
> drivers/built-in.o: In function `setup_earlycon':
> :(.init.text+0x2c4c): undefined reference to `uart_parse_earlycon'
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
>
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index 1aec4404062d..f1a4f9eccc44 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -1540,6 +1540,7 @@ config SERIAL_FSL_LPUART
> depends on HAS_DMA
> select SERIAL_CORE
> select SERIAL_EARLYCON
> + select SERIAL_CORE_CONSOLE
So the next uart that is not FSL that selects EARLYCON will fail in the
same way. Isn't it better to have EARLYCON select it or depend on it;
i.e. go to the root of the problem?
Paul.
--
> help
> Support for the on-chip lpuart on some Freescale SOCs.
>
>
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