[hnaz-mm:master 92/304] mm/page-writeback.c:93:28: error: 'dirty_bytes_min' defined but not used

[kernel test robot]

tree:   https://github.com/hnaz/linux-mm master
head:   31e523f69aa14a1f4ba298c63034d8dc62c4aae7
commit: d2d94dec619e0ab7f6805f3bc6e7932d71bfe765 [92/304] mm: move page-writeback sysctls to their own file
config: powerpc64-randconfig-s032-20220213 (https://download.01.org/0day-ci/archive/20220213/202202131948.o0qQogUI-lkp@xxxxxxxxx/config)
compiler: powerpc64-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://github.com/hnaz/linux-mm/commit/d2d94dec619e0ab7f6805f3bc6e7932d71bfe765
        git remote add hnaz-mm https://github.com/hnaz/linux-mm
        git fetch --no-tags hnaz-mm master
        git checkout d2d94dec619e0ab7f6805f3bc6e7932d71bfe765
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=powerpc SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   mm/page-writeback.c:2002:12: error: 'dirty_writeback_centisecs_handler' defined but not used [-Werror=unused-function]
    2002 | static int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/page-writeback.c:545:12: error: 'dirty_bytes_handler' defined but not used [-Werror=unused-function]
     545 | static int dirty_bytes_handler(struct ctl_table *table, int write,
         |            ^~~~~~~~~~~~~~~~~~~
   mm/page-writeback.c:531:12: error: 'dirty_ratio_handler' defined but not used [-Werror=unused-function]
     531 | static int dirty_ratio_handler(struct ctl_table *table, int write, void *buffer,
         |            ^~~~~~~~~~~~~~~~~~~
   mm/page-writeback.c:520:12: error: 'dirty_background_bytes_handler' defined but not used [-Werror=unused-function]
     520 | static int dirty_background_bytes_handler(struct ctl_table *table, int write,
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/page-writeback.c:509:12: error: 'dirty_background_ratio_handler' defined but not used [-Werror=unused-function]
     509 | static int dirty_background_ratio_handler(struct ctl_table *table, int write,
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> mm/page-writeback.c:93:28: error: 'dirty_bytes_min' defined but not used [-Werror=unused-const-variable=]
      93 | static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
         |                            ^~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/dirty_bytes_min +93 mm/page-writeback.c

    91	
    92	/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
  > 93	static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
    94	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx