Subject: Re: [PATCH v2 2/4] net: Expose available time stamping layers to user space.

From: kernel test robot <[email-masked]>
Date: Sat, 4 Mar 2023 02:13:17 +0800

Hi Köry,

I love your patch! Perhaps something to improve:

[auto build test WARNING on v6.2]
[also build test WARNING on next-20230303]
[cannot apply to net/master net-next/master horms-ipvs/master linus/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/K-ry-Maincent/net-ethtool-Refactor-identical-get_ts_info-implementations/20230304-004527
patch link:    https://lore.kernel.org/r/20230303164248.499286-3-kory.maincent%40bootlin.com
patch subject: [PATCH v2 2/4] net: Expose available time stamping layers to user space.
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230304/[email-masked]/config)
compiler: m68k-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/90d54e1c6ed12a0b55c868e7808d93f61dad3534
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review K-ry-Maincent/net-ethtool-Refactor-identical-get_ts_info-implementations/20230304-004527
        git checkout 90d54e1c6ed12a0b55c868e7808d93f61dad3534
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash net/core/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email-masked]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All warnings (new ones prefixed by >>):

   net/core/net-sysfs.c: In function 'available_timestamping_providers_show':
>> net/core/net-sysfs.c:627:35: warning: variable 'ops' set but not used [-Wunused-but-set-variable]
     627 |         const struct ethtool_ops *ops;
         |                                   ^~~
   net/core/net-sysfs.c: In function 'current_timestamping_provider_show':
   net/core/net-sysfs.c:657:35: warning: variable 'ops' set but not used [-Wunused-but-set-variable]
     657 |         const struct ethtool_ops *ops;
         |                                   ^~~

vim +/ops +627 net/core/net-sysfs.c

   622	
   623	static ssize_t available_timestamping_providers_show(struct device *dev,
   624							     struct device_attribute *attr,
   625							     char *buf)
   626	{
 > 627		const struct ethtool_ops *ops;
   628		struct net_device *netdev;
   629		struct phy_device *phydev;
   630		int ret = 0;
   631	
   632		netdev = to_net_dev(dev);
   633		phydev = netdev->phydev;
   634		ops = netdev->ethtool_ops;
   635	
   636		if (!rtnl_trylock())
   637			return restart_syscall();
   638	
   639		ret += sprintf(buf, "%s\n", "mac");
   640		buf += 4;
   641	
   642		if (phy_has_tsinfo(phydev)) {
   643			ret += sprintf(buf, "%s\n", "phy");
   644			buf += 4;
   645		}
   646	
   647		rtnl_unlock();
   648	
   649		return ret;
   650	}
   651	static DEVICE_ATTR_RO(available_timestamping_providers);
   652	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests