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

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Date:   Sat, 19 Sep 2020 10:48:41 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
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 2020/9/18 19:17, Greg KH wrote:
> 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?
Fixes: d1a1af2cdf19 ("hvc: dcc: Add earlycon support")
>
> thanks,
>
> greg k-h
> .