linux-kernel - Re: [PATCH] serial: parisc: GSC: fix build when PCI

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Date:   Sun, 13 Feb 2022 23:15:05 +0100
From:   Helge Deller <deller@....de>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org
Cc:     kernel test robot <lkp@...el.com>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        linux-parisc@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org, Jiri Slaby <jirislaby@...nel.org>,
        Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH] serial: parisc: GSC: fix build when PCI_LBA is not set

On 2/13/22 22:07, Randy Dunlap wrote:
>
>
> On 2/13/22 12:35, Helge Deller wrote:
>> Hi Randy,
>>
>> On 2/13/22 20:39, Randy Dunlap wrote:
>>> There is a build error when using a kernel .config file from
>>> 'kernel test robot' for a different build problem:
>>>
>>> hppa64-linux-ld: drivers/tty/serial/8250/8250_gsc.o: in function `.LC3':
>>> (.data.rel.ro+0x18): undefined reference to `iosapic_serial_irq'
>>>
>>> when:
>>>   CONFIG_GSC=y
>>>   CONFIG_SERIO_GSCPS2=y
>>>   CONFIG_SERIAL_8250_GSC=y
>>>   CONFIG_PCI is not set
>>>     and hence PCI_LBA is not set.
>>>   IOSAPIC depends on PCI_LBA, so IOSAPIC is not set/enabled.
>>>
>>> Making SERIAL_8250_GSC depend on PCI_LBA prevents the build error.
>>
>> It maybe makes the build error go away, but ...
>>
>>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>>> Reported-by: kernel test robot <lkp@...el.com>
>>> Cc: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
>>> Cc: Helge Deller <deller@....de>
>>> Cc: linux-parisc@...r.kernel.org
>>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>> Cc: linux-serial@...r.kernel.org
>>> Cc: Jiri Slaby <jirislaby@...nel.org>
>>> Cc: Johan Hovold <johan@...nel.org>
>>> ---
>>>  drivers/tty/serial/8250/Kconfig |    2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> --- linux-next-20220211.orig/drivers/tty/serial/8250/Kconfig
>>> +++ linux-next-20220211/drivers/tty/serial/8250/Kconfig
>>> @@ -118,7 +118,7 @@ config SERIAL_8250_CONSOLE
>>>
>>>  config SERIAL_8250_GSC
>>>  	tristate
>>> -	depends on SERIAL_8250 && GSC
>>> +	depends on SERIAL_8250 && GSC && PCI_LBA
>>>  	default SERIAL_8250
>>
>> The serial device is on the GSC bus, so if you make it
>> dependend on the PCI bus it will not be useable on machines
>> which only have a GSC bus...
>>
>> We need another patch.
>> Do you have a link to the build error?
>
>
> No, it's from the other build error that you just replied to,
> where the incorrect compiler was used.
>
> I'll recheck it and reconsider what to do, if anything.

Ok, thank you!

By the way, I just sent another patch (and added it to the parisc for-next tree)
which should at least give a better error message if someone uses the wrong compiler:
https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/commit/?h=for-next&id=b160628e9ebcdc85d0db9d7f423c26b3c7c179d0

Helge