linux-kernel - Re: [PATCH -next] tty: hvc: fix link error with CONFIG_SERIAL_CORE

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Date:   Fri, 18 Sep 2020 13:17:08 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] tty: hvc: fix link error with
 CONFIG_SERIAL_CORE_CONSOLE=n

On Fri, Sep 18, 2020 at 05:20:30PM +0800, Yang Yingliang wrote:
> Fix the link error by selecting SERIAL_CORE_CONSOLE.
> 
> aarch64-linux-gnu-ld: drivers/tty/hvc/hvc_dcc.o: in function `dcc_early_write':
> hvc_dcc.c:(.text+0x164): undefined reference to `uart_console_write'
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  drivers/tty/hvc/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig
> index d1b27b0522a3..8d60e0ff67b4 100644
> --- a/drivers/tty/hvc/Kconfig
> +++ b/drivers/tty/hvc/Kconfig
> @@ -81,6 +81,7 @@ config HVC_DCC
>  	bool "ARM JTAG DCC console"
>  	depends on ARM || ARM64
>  	select HVC_DRIVER
> +	select SERIAL_CORE_CONSOLE
>  	help
>  	  This console uses the JTAG DCC on ARM to create a console under the HVC
>  	  driver. This console is used through a JTAG only on ARM. If you don't have
> -- 
> 2.25.1
> 

Same question here, what caused this problem to happen?

thanks,

greg k-h