linux-kernel - kernel/sched/rt.c:9:18: warning: 'max_rt

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Date:   Sun, 7 Aug 2022 04:19:15 +0800
From:   kernel test robot <lkp@...el.com>
To:     Baisong Zhong <zhongbaisong@...wei.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: kernel/sched/rt.c:9:18: warning: 'max_rt_runtime' defined but not
 used

Hi Baisong,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   20cf903a0c407cef19300e5c85a03c82593bde36
commit: 28f152cd0926596e69d412467b11b6fe6fe4e864 sched/rt: fix build error when CONFIG_SYSCTL is disable
date:   4 months ago
config: i386-tinyconfig (https://download.01.org/0day-ci/archive/20220807/202208070450.S8sp9M2v-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=28f152cd0926596e69d412467b11b6fe6fe4e864
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 28f152cd0926596e69d412467b11b6fe6fe4e864
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/

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

All warnings (new ones prefixed by >>):

   In file included from kernel/sched/build_policy.c:43:
>> kernel/sched/rt.c:9:18: warning: 'max_rt_runtime' defined but not used [-Wunused-const-variable=]
       9 | static const u64 max_rt_runtime = MAX_BW;
         |                  ^~~~~~~~~~~~~~


vim +/max_rt_runtime +9 kernel/sched/rt.c

d505b8af58912a Huaixin Chang  2020-04-25  @9  static const u64 max_rt_runtime = MAX_BW;
ce0dbbbb30aee6 Clark Williams 2013-02-07  10  

:::::: The code at line 9 was first introduced by commit
:::::: d505b8af58912ae1e1a211fabc9995b19bd40828 sched: Defend cfs and rt bandwidth quota against overflow

:::::: TO: Huaixin Chang <changhuaixin@...ux.alibaba.com>
:::::: CC: Peter Zijlstra <peterz@...radead.org>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp