[linux-next:master 6458/11136] drivers/hwmon/gpd-fan.c:231:9: error: implicit declaration of function 'outb'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   846bd2225ec3cfa8be046655e02b9457ed41973e
commit: 0ab88e2394392f475b8857ac82c0c987841217f8 [6458/11136] hwmon: add GPD devices sensor driver
config: i386-buildonly-randconfig-004-20250920 (https://download.01.org/0day-ci/archive/20250920/202509200214.i2QX7iwD-lkp@intel.com/config)
compiler: gcc-13 (Debian 13.3.0-16) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250920/202509200214.i2QX7iwD-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509200214.i2QX7iwD-lkp@intel.com/

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' [-Werror=implicit-function-declaration]
     231 |         outb(0x2E, addr_port);
         |         ^~~~
>> drivers/hwmon/gpd-fan.c:244:16: error: implicit declaration of function 'inb' [-Werror=implicit-function-declaration]
     244 |         *val = inb(data_port);
         |                ^~~
   cc1: some warnings being treated as errors


vim +/outb +231 drivers/hwmon/gpd-fan.c

   224	
   225	// Helper functions to handle EC read/write
   226	static void gpd_ecram_read(u16 offset, u8 *val)
   227	{
   228		u16 addr_port = gpd_driver_priv.drvdata->addr_port;
   229		u16 data_port = gpd_driver_priv.drvdata->data_port;
   230	
 > 231		outb(0x2E, addr_port);
   232		outb(0x11, data_port);
   233		outb(0x2F, addr_port);
   234		outb((u8)((offset >> 8) & 0xFF), data_port);
   235	
   236		outb(0x2E, addr_port);
   237		outb(0x10, data_port);
   238		outb(0x2F, addr_port);
   239		outb((u8)(offset & 0xFF), data_port);
   240	
   241		outb(0x2E, addr_port);
   242		outb(0x12, data_port);
   243		outb(0x2F, addr_port);
 > 244		*val = inb(data_port);
   245	}
   246	

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