tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
head:   b2d5b9cec60fecc72a13191c2c6c05acf60975a5
commit: ceeadb83aea28372e54857bf88ab7e17af48ab7b [13/47] sched: Make struct sched_statistics independent of fair sched class
config: microblaze-buildonly-randconfig-r002-20211010 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=ceeadb83aea28372e54857bf88ab7e17af48ab7b
        git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
        git fetch --no-tags tip sched/core
        git checkout ceeadb83aea28372e54857bf88ab7e17af48ab7b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=microblaze 

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

All errors (new ones prefixed by >>):

   kernel/sched/core.c: In function 'ttwu_stat':
   kernel/sched/core.c:3482:20: error: variable 'rq' set but not used [-Werror=unused-but-set-variable]
    3482 |         struct rq *rq;
         |                    ^~
   kernel/sched/core.c: In function 'cpu_cfs_stat_show':
>> kernel/sched/core.c:10400:42: error: variable 'stats' set but not used [-Werror=unused-but-set-variable]
   10400 |                 struct sched_statistics *stats;
         |                                          ^~~~~
   cc1: all warnings being treated as errors


vim +/stats +10400 kernel/sched/core.c

 10389	
 10390	static int cpu_cfs_stat_show(struct seq_file *sf, void *v)
 10391	{
 10392		struct task_group *tg = css_tg(seq_css(sf));
 10393		struct cfs_bandwidth *cfs_b = &tg->cfs_bandwidth;
 10394	
 10395		seq_printf(sf, "nr_periods %d\n", cfs_b->nr_periods);
 10396		seq_printf(sf, "nr_throttled %d\n", cfs_b->nr_throttled);
 10397		seq_printf(sf, "throttled_time %llu\n", cfs_b->throttled_time);
 10398	
 10399		if (schedstat_enabled() && tg != &root_task_group) {
 10400			struct sched_statistics *stats;
 10401			u64 ws = 0;
 10402			int i;
 10403	
 10404			for_each_possible_cpu(i) {
 10405				stats = __schedstats_from_se(tg->se[i]);
 10406				ws += schedstat_val(stats->wait_sum);
 10407			}
 10408	
 10409			seq_printf(sf, "wait_sum %llu\n", ws);
 10410		}
 10411	
 10412		seq_printf(sf, "nr_bursts %d\n", cfs_b->nr_burst);
 10413		seq_printf(sf, "burst_time %llu\n", cfs_b->burst_time);
 10414	
 10415		return 0;
 10416	}
 10417	#endif /* CONFIG_CFS_BANDWIDTH */
 10418	#endif /* CONFIG_FAIR_GROUP_SCHED */
 10419	

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