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Date:   Tue, 3 Oct 2023 02:03:53 +0800
From:   kernel test robot <lkp@intel.com>
To:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Mathias Nyman <mathias.nyman@linux.intel.com>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     oe-kbuild-all@lists.linux.dev,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v1 03/10] xhci: dbc: Use sysfs_emit() to instead of
 scnprintf()
Message-ID: <202310030150.M1SfrYmG-lkp@intel.com>
References: <20231002161610.2648818-3-andriy.shevchenko@linux.intel.com>
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In-Reply-To: <20231002161610.2648818-3-andriy.shevchenko@linux.intel.com>
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Hi Andy,

kernel test robot noticed the following build warnings:

[auto build test WARNING on usb/usb-testing]
[also build test WARNING on usb/usb-next usb/usb-linus linus/master v6.6-rc4 next-20230929]
[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/Andy-Shevchenko/xhci-dbc-Convert-to-use-sysfs_streq/20231003-002032
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
patch link:    https://lore.kernel.org/r/20231002161610.2648818-3-andriy.shevchenko%40linux.intel.com
patch subject: [PATCH v1 03/10] xhci: dbc: Use sysfs_emit() to instead of scnprintf()
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20231003/202310030150.M1SfrYmG-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231003/202310030150.M1SfrYmG-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310030150.M1SfrYmG-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/usb/host/xhci-dbgcap.c: In function 'dbc_show':
>> drivers/usb/host/xhci-dbgcap.c:926:34: warning: unused variable 'p' [-Wunused-variable]
     926 |         const char              *p;
         |                                  ^


vim +/p +926 drivers/usb/host/xhci-dbgcap.c

60f4451ef37351 Andy Shevchenko 2023-10-02  921  
dfba2174dc421e Lu Baolu        2017-12-08  922  static ssize_t dbc_show(struct device *dev,
dfba2174dc421e Lu Baolu        2017-12-08  923  			struct device_attribute *attr,
dfba2174dc421e Lu Baolu        2017-12-08  924  			char *buf)
dfba2174dc421e Lu Baolu        2017-12-08  925  {
dfba2174dc421e Lu Baolu        2017-12-08 @926  	const char		*p;
dfba2174dc421e Lu Baolu        2017-12-08  927  	struct xhci_dbc		*dbc;
dfba2174dc421e Lu Baolu        2017-12-08  928  	struct xhci_hcd		*xhci;
dfba2174dc421e Lu Baolu        2017-12-08  929  
dfba2174dc421e Lu Baolu        2017-12-08  930  	xhci = hcd_to_xhci(dev_get_drvdata(dev));
dfba2174dc421e Lu Baolu        2017-12-08  931  	dbc = xhci->dbc;
dfba2174dc421e Lu Baolu        2017-12-08  932  
60f4451ef37351 Andy Shevchenko 2023-10-02  933  	if (dbc->state >= ARRAY_SIZE(dbc_state_strings))
60f4451ef37351 Andy Shevchenko 2023-10-02  934  		return sysfs_emit(buf, "unknown\n");
dfba2174dc421e Lu Baolu        2017-12-08  935  
60f4451ef37351 Andy Shevchenko 2023-10-02  936  	return sysfs_emit(buf, "%s\n", dbc_state_strings[dbc->state]);
dfba2174dc421e Lu Baolu        2017-12-08  937  }
dfba2174dc421e Lu Baolu        2017-12-08  938  

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