linux-kernel - [mcgrof:sysctl-testing 12/18] mm/page-writeback.c:93:28: warning: unused variable 'dirty_bytes

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Date:   Fri, 8 Apr 2022 15:38:53 +0800
From:   kernel test robot <lkp@...el.com>
To:     zhanglianjie <zhanglianjie@...ontech.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: [mcgrof:sysctl-testing 12/18] mm/page-writeback.c:93:28: warning:
 unused variable 'dirty_bytes_min'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git sysctl-testing
head:   7cde53da38a3ea00d75ef6a6ab06fa85b80bcf87
commit: 87125d15aa3c4046e902758a39062f213b3664ad [12/18] mm: move page-writeback sysctls to their own file
config: s390-randconfig-r034-20220406 (https://download.01.org/0day-ci/archive/20220408/202204081510.D41wQr6m-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 6b306233f78876a1d197ed6e1f05785505de7c63)
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
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/commit/?id=87125d15aa3c4046e902758a39062f213b3664ad
        git remote add mcgrof https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git
        git fetch --no-tags mcgrof sysctl-testing
        git checkout 87125d15aa3c4046e902758a39062f213b3664ad
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> mm/page-writeback.c:93:28: warning: unused variable 'dirty_bytes_min' [-Wunused-const-variable]
   static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
                              ^
   1 warning generated.


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
https://01.org/lkp