From: Arnd Bergmann <arnd@xxxxxxxx> The newly added function is used from a loadable module, so it has to be exported the same way as the other function in this file: ERROR: modpost: "serial_8250_warn_need_ioport" [drivers/tty/serial/8250/8250_pci.ko] undefined! Fixes: 7c7e6c8924e7 ("tty: serial: handle HAS_IOPORT dependencies") Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> --- The build regression is currently part of my asm-generic tree, so I've applied this fixup on top. drivers/tty/serial/8250/8250_pcilib.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tty/serial/8250/8250_pcilib.c b/drivers/tty/serial/8250/8250_pcilib.c index ec4d04177802..3bdccf76f71d 100644 --- a/drivers/tty/serial/8250/8250_pcilib.c +++ b/drivers/tty/serial/8250/8250_pcilib.c @@ -19,6 +19,7 @@ int serial_8250_warn_need_ioport(struct pci_dev *dev) return -ENXIO; } +EXPORT_SYMBOL_NS_GPL(serial_8250_warn_need_ioport, SERIAL_8250_PCI); int serial8250_pci_setup_port(struct pci_dev *dev, struct uart_8250_port *port, u8 bar, unsigned int offset, int regshift) -- 2.39.5