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

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Message-ID: <265B8FE9306198E5+0131c750-3995-4158-84e7-ad73792e6934@uniontech.com>
Date: Fri, 24 Oct 2025 13:49:08 +0800
From: Cryolitia PukNgae <cryolitia@...ontech.com>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 Guenter Roeck <linux@...ck-us.net>
Subject: Re: 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);
>          |                ^~~
> 

I don't understand...... I have already added CONFIG_HAS_IOPORT to depends. If this is not enough, what else should I do?

> 
> 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	
>