linux-kernel - Re: [PATCH] tty: serial: fsl_lpuart: select SERIAL_FSL_LPUART for SERIAL_FSL_LPUART

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Message-ID: <e767cb93-eb46-a82c-186c-68d12cefce31@redhat.com>
Date:   Sun, 26 Feb 2023 07:02:07 -0800
From:   Tom Rix <trix@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>, gregkh@...uxfoundation.org,
        jirislaby@...nel.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty: serial: fsl_lpuart: select SERIAL_FSL_LPUART for
 SERIAL_FSL_LPUART_CONSOLE


On 2/25/23 10:38 AM, Randy Dunlap wrote:
>
> On 2/25/23 10:16, Randy Dunlap wrote:
>>
>> On 2/25/23 10:03, Randy Dunlap wrote:
>>>
>>> On 2/25/23 09:51, Tom Rix wrote:
>>>> On 2/25/23 9:46 AM, Randy Dunlap wrote:
>>>>> Hi--
>>>>>
>>>>> On 2/25/23 09:39, Tom Rix wrote:
>>>>>> A rand config causes this link error
>>>>>> ld: drivers/tty/serial/earlycon.o: in function `parse_options':
>>>>>> drivers/tty/serial/earlycon.c:99: undefined reference to `uart_parse_earlycon'
>>>>>>
>>>>>> The rand config has
>>>>>> CONFIG_SERIAL_CORE=m
>>>>>> CONFIG_SERIAL_EARLYCON=y
>>>>>> CONFIG_SERIAL_FSL_LPUART=m
>>>>>> CONFIG_SERIAL_FSL_LPUART_CONSOLE=y
>>>>>>
>>>>>> SERIAL_FSL_LPUART should have been selected instead of depends on-ed.
>>>>>>
>>>>>> Signed-off-by: Tom Rix <trix@...hat.com>
>>>>>> ---
>>>>>>    drivers/tty/serial/Kconfig | 2 +-
>>>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>>>
>>>>>> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
>>>>>> index 625358f44419..b24d74d389fc 100644
>>>>>> --- a/drivers/tty/serial/Kconfig
>>>>>> +++ b/drivers/tty/serial/Kconfig
>>>>>> @@ -1313,7 +1313,7 @@ config SERIAL_FSL_LPUART
>>>>>>      config SERIAL_FSL_LPUART_CONSOLE
>>>>>>        bool "Console on Freescale lpuart serial port"
>>>>>> -    depends on SERIAL_FSL_LPUART
>>>>>> +    select SERIAL_FSL_LPUART
>>>>> Most other _CONSOLE Kconfig have:
>>>>>
>>>>>      depends on SERIAL_FSL_LPUART=y
>>>> commit 5779a072c248db7a40cfd0f5ea958097fd1d9a30 removed the =y. so it could be built as a module.
>>>>
>>> uh. But it's still a bool, not a tristate. How does that work?
>> OK, I see. :)
>>
>> Well, I don't see another decent solution ATM.
>>
>> Tom, does your patch fix the build error?
>>
>> What are the listed CONFIG settings after the patch?
> OK, after I apply the patch, all of the listed config symbols are
> changed to =y (builtin), so not built as a loadable module.
>
> Do you see something different?

No, all y's.

Since the showing the after state is useful, I added it to v2

>
>
>>>>> e.g.
>>>>>
>>>>> but I noticed a few others with a similar problem.
>>>>>
>>>>>>        select SERIAL_CORE_CONSOLE
>>>>>>        select SERIAL_EARLYCON
>>>>>>        help