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

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Message-ID: <2F51425F3E6D2182+7c76e5f7-bb24-4d39-aa00-33e486ff4cd9@uniontech.com>
Date: Tue, 28 Oct 2025 10:13:31 +0800
From: Cryolitia PukNgae <cryolitia@...ontech.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: kernel test robot <lkp@...el.com>, 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,
> 
> On Sat, 25 Oct 2025 at 15:49, Cryolitia PukNgae <cryolitia@...ontech.com> 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@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?
> 
> Missing #include <linux/io.h>?
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 

It has been fixed[1] a little earlier, thanks for your help

1. https://lore.kernel.org/all/20251024202042.752160-1-krishnagopi487@gmail.com/

Greetings,
Cryolitia