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

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Message-ID: <202510240817.vt3eQ3qL-lkp@intel.com>
Date: Fri, 24 Oct 2025 08:05:27 +0800
From: kernel test robot <lkp@...el.com>
To: Cryolitia PukNgae <cryolitia@...ontech.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>
Subject: drivers/hwmon/gpd-fan.c:231:9: error: implicit declaration of
 function 'outb'

Hi Cryolitia,

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@intel.com/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@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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510240817.vt3eQ3qL-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' [-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);
         |                ^~~


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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https://github.com/intel/lkp-tests/wiki