Re: [PATCH] serial: parisc: GSC: fix build when PCI_LBA is not set

[Helge Deller <deller@gmx.de>]

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@infradead.org>
> Reported-by: kernel test robot <lkp@intel.com>
> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
> Cc: Helge Deller <deller@gmx.de>
> Cc: linux-parisc@vger.kernel.org
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: linux-serial@vger.kernel.org
> Cc: Jiri Slaby <jirislaby@kernel.org>
> Cc: Johan Hovold <johan@kernel.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?

Helge