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

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Message-ID: <e8781486-b3ce-b2dd-2c84-f0b2a651556f@gmx.de>
Date:   Mon, 14 Feb 2022 13:05:44 +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 2/14/22 01:15, Randy Dunlap wrote:
> Hi,
>
> On 2/13/22 14:15, Helge Deller wrote:
>> 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!
>
> I dunno what to do. This:
>
> #ifdef CONFIG_64BIT
> 	if (!dev->irq && (dev->id.sversion == 0xad))
> 		dev->irq = iosapic_serial_irq(dev);
> #endif
>
> makes it look like 64BIT requires IOSAPIC (hence PCI_LBA).

Although I think all 64bit machines have a PCI bus, the better
fix is that the driver should only call iosapic_serial_irq(dev)
if CONFIG_IOSAPIC is set. This patch fixes the build:

-#ifdef CONFIG_64BIT
+#ifdef CONFIG_IOSAPIC
        if (!dev->irq && (dev->id.sversion == 0xad))
                dev->irq = iosapic_serial_irq(dev);
 #endif

Will you send an updated patch?

Thanks!
Helge