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
From: Ryder Lee
Date: Fri Aug 13 2021 - 12:26:38 EST
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@xxxxxxxxx>
>
> 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@xxxxxxxxx/T/