linux-kernel - Re: drivers/net/wireless/mediatek/mt76/mt7915/init.c:134:41: warning: passing argument 1 of 'thermal_cooling_device_register' discards 'const' qualifier from pointer target type

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Date:   Sat, 14 Aug 2021 00:26:13 +0800
From:   Ryder Lee <ryder.lee@...iatek.com>
To:     kernel test robot <lkp@...el.com>
CC:     <kbuild-all@...ts.01.org>, <linux-kernel@...r.kernel.org>,
        Felix Fietkau <nbd@....name>
Subject: Re: drivers/net/wireless/mediatek/mt76/mt7915/init.c:134:41:
 warning: passing argument 1 of 'thermal_cooling_device_register' discards
 'const' qualifier from pointer target type

On Fri, 2021-08-13 at 15:19 +0800, kernel test robot wrote:
> Hi Ryder,
> 
> FYI, the error/warning still remains.
> 
> tree:   
> https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git__;!!CTRNKA9wMg0ARbw!1yGhyZ2zcgDSAZInyFCpTWQq7wm0KK7MwoYWKEME_DrayfcYfxh4i9dnufVN9C-c$
>   master
> head:   f8e6dfc64f6135d1b6c5215c14cd30b9b60a0008
> commit: 34b877d972bec8cbf397a57393317672cf92996f mt76: mt7915: add
> thermal cooling device support
> date:   8 weeks ago
> config: x86_64-buildonly-randconfig-r001-20210812 (attached as
> .config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build):
>         # 
> https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=34b877d972bec8cbf397a57393317672cf92996f__;!!CTRNKA9wMg0ARbw!1yGhyZ2zcgDSAZInyFCpTWQq7wm0KK7MwoYWKEME_DrayfcYfxh4i9dnueYlmjdK$
>  
>         git remote add linus 
> https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git__;!!CTRNKA9wMg0ARbw!1yGhyZ2zcgDSAZInyFCpTWQq7wm0KK7MwoYWKEME_DrayfcYfxh4i9dnufVN9C-c$
>  
>         git fetch --no-tags linus master
>         git checkout 34b877d972bec8cbf397a57393317672cf92996f
>         # save the attached .config to linux build tree
>         make W=1 ARCH=x86_64 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
>    drivers/net/wireless/mediatek/mt76/mt7915/init.c: In function
> 'mt7915_thermal_init':
> > > drivers/net/wireless/mediatek/mt76/mt7915/init.c:134:41: warning:
> > > passing argument 1 of 'thermal_cooling_device_register' discards
> > > 'const' qualifier from pointer target type [-Wdiscarded-
> > > qualifiers]
> 
>      134 |  cdev = thermal_cooling_device_register(wiphy_name(wiphy),
> phy,
>          |                                         ^~~~~~~~~~~~~~~~~
>    In file included from
> drivers/net/wireless/mediatek/mt76/mt7915/init.c:7:
>    include/linux/thermal.h:407:39: note: expected 'char *' but
> argument is of type 'const char *'
>      407 | thermal_cooling_device_register(char *type, void *devdata,
>          |                                 ~~~~~~^~~~
> 
> 
> vim +134 drivers/net/wireless/mediatek/mt76/mt7915/init.c
> 
>    127	
>    128	static int mt7915_thermal_init(struct mt7915_phy *phy)
>    129	{
>    130		struct wiphy *wiphy = phy->mt76->hw->wiphy;
>    131		struct thermal_cooling_device *cdev;
>    132		struct device *hwmon;
>    133	
>  > 134		cdev =
> thermal_cooling_device_register(wiphy_name(wiphy), phy,
>    135						       &mt7915_
> thermal_ops);
>    136		if (!IS_ERR(cdev)) {
>    137			if (sysfs_create_link(&wiphy->dev.kobj, 
> &cdev->device.kobj,
>    138					      "cooling_device")
> < 0)
>    139				thermal_cooling_device_unregist
> er(cdev);
>    140			else
>    141				phy->cdev = cdev;
>    142		}
>    143	
>    144		if (!IS_REACHABLE(CONFIG_HWMON))
>    145			return 0;
>    146	
>    147		hwmon =
> devm_hwmon_device_register_with_groups(&wiphy->dev,
>    148							       
> wiphy_name(wiphy), phy,
>    149							       
> mt7915_hwmon_groups);
>    150		if (IS_ERR(hwmon))
>    151			return PTR_ERR(hwmon);
>    152	
>    153		return 0;
>    154	}
>    155	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> 
https://urldefense.com/v3/__https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org__;!!CTRNKA9wMg0ARbw!1yGhyZ2zcgDSAZInyFCpTWQq7wm0KK7MwoYWKEME_DrayfcYfxh4i9dnuV9Db3hd$

The cause is 
https://lore.kernel.org/lkml/ABDAFCAB-8DF5-41A7-B1E0-4953A9BF32B3@gmail.com/T/