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. Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Reported-by: kernel test robot <lkp@xxxxxxxxx> Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> Cc: Helge Deller <deller@xxxxxx> Cc: linux-parisc@xxxxxxxxxxxxxxx Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: linux-serial@xxxxxxxxxxxxxxx Cc: Jiri Slaby <jirislaby@xxxxxxxxxx> Cc: Johan Hovold <johan@xxxxxxxxxx> --- 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 config SERIAL_8250_DMA