Re: [PATCH -next 1/3] wbt: don't show valid wbt_lat_usec in sysfs while wbt is disabled

[kernel test robot]

Hi Yu,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20220916]

url:    https://github.com/intel-lab-lkp/linux/commits/Yu-Kuai/blk-wbt-simple-improvment-to-enable-wbt-correctly/20220919-094019
base:    d5538ab91d3a9a237805be6f8c6c272af2987995
config: x86_64-randconfig-a001-20220919 (https://download.01.org/0day-ci/archive/20220919/202209191345.OaqfJF8y-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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/dd5a7be692b8fc9794f29648d0805a2d65b9c4de
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Yu-Kuai/blk-wbt-simple-improvment-to-enable-wbt-correctly/20220919-094019
        git checkout dd5a7be692b8fc9794f29648d0805a2d65b9c4de
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> block/blk-sysfs.c:475:8: error: implicit declaration of function 'wbt_disabled' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           lat = wbt_disabled(q) ? 0 : div_u64(wbt_get_min_lat(q), 1000);
                 ^
   block/blk-sysfs.c:500:6: error: implicit declaration of function 'wbt_disabled' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           if (wbt_disabled(q))
               ^
   2 errors generated.


vim +/wbt_disabled +475 block/blk-sysfs.c

   467	
   468	static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
   469	{
   470		u64 lat;
   471	
   472		if (!wbt_rq_qos(q))
   473			return -EINVAL;
   474	
 > 475		lat = wbt_disabled(q) ? 0 : div_u64(wbt_get_min_lat(q), 1000);
   476	
   477		return sprintf(page, "%llu\n", lat);
   478	}
   479	

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