Re: drivers/hwmon/gpd-fan.c:231:9: error: implicit declaration of function 'outb'

[Geert Uytterhoeven]

Hi Cryolitia,

On Sat, 25 Oct 2025 at 15:49, Cryolitia PukNgae <cryolitia@xxxxxxxxxxxxx> wrote:
> > FYI, the error/warning still remains.
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   266ee584e55eed108583ab4f45b5de734522502d
> > commit: 0ab88e2394392f475b8857ac82c0c987841217f8 hwmon: add GPD devices sensor driver
> > date:   6 weeks ago
> > config: i386-buildonly-randconfig-002-20251024 (https://download.01.org/0day-ci/archive/20251024/202510240817.vt3eQ3qL-lkp@xxxxxxxxx/config)
> > compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251024/202510240817.vt3eQ3qL-lkp@xxxxxxxxx/reproduce)
> >
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202510240817.vt3eQ3qL-lkp@xxxxxxxxx/
> >
> > All errors (new ones prefixed by >>):
> >
> >    drivers/hwmon/gpd-fan.c: In function 'gpd_ecram_read':
> >>> drivers/hwmon/gpd-fan.c:231:9: error: implicit declaration of function 'outb' [-Wimplicit-function-declaration]
> >      231 |         outb(0x2E, addr_port);
> >          |         ^~~~
> >>> drivers/hwmon/gpd-fan.c:244:16: error: implicit declaration of function 'inb' [-Wimplicit-function-declaration]
> >      244 |         *val = inb(data_port);
> >          |                ^~~
> >
>
> I don't understand...... I have already added CONFIG_HAS_IOPORT to depends. If this is not enough, what else should I do?

Missing #include <linux/io.h>?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds