[kbuild-all] [tip:sched/core 14/47] kernel/sched/fair.c:893:22: error: variable 'p' set but not used

tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core head: b2d5b9cec60fecc72a13191c2c6c05acf60975a5 commit: 60f2415e19d3948641149ac6aca137a7be1d1952 [14/47] sched: Make schedstats helpers independent of fair sched class config: hexagon-buildonly-randconfig-r002-20211012 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c3dcf39554dbea780d6cb7e12239451ba47a2668) 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=60... 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 60f2415e19d3948641149ac6aca137a7be1d1952 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): kernel/sched/fair.c:860:28: error: variable 'stats' set but not used [-Werror,-Wunused-but-set-variable] struct sched_statistics *stats; ^ kernel/sched/fair.c:892:27: error: variable 'stats' set but not used [-Werror,-Wunused-but-set-variable] struct sched_statistics *stats; ^ struct task_struct *p = NULL; ^ kernel/sched/fair.c:910:22: error: variable 'p' set but not used [-Werror,-Wunused-but-set-variable] struct task_struct *p = NULL; ^ kernel/sched/fair.c:909:27: error: variable 'stats' set but not used [-Werror,-Wunused-but-set-variable] struct sched_statistics *stats; ^ struct task_struct *tsk = NULL; ^ kernel/sched/fair.c:935:27: error: variable 'stats' set but not used [-Werror,-Wunused-but-set-variable] struct sched_statistics *stats; ^ kernel/sched/fair.c:4451:28: error: variable 'stats' set but not used [-Werror,-Wunused-but-set-variable] struct sched_statistics *stats; ^ 8 errors generated. vim +/p +893 kernel/sched/fair.c 840 841 /* 842 * Update the current task's runtime statistics. 843 */ 844 static void update_curr(struct cfs_rq *cfs_rq) 845 { 846 struct sched_entity *curr = cfs_rq->curr; 847 u64 now = rq_clock_task(rq_of(cfs_rq)); 848 u64 delta_exec; 849 850 if (unlikely(!curr)) 851 return; 852 853 delta_exec = now - curr->exec_start; 854 if (unlikely((s64)delta_exec <= 0)) 855 return; 856 857 curr->exec_start = now; 858 859 if (schedstat_enabled()) { 861 862 stats = __schedstats_from_se(curr); 863 __schedstat_set(stats->exec_max, 864 max(delta_exec, stats->exec_max)); 865 } 866 867 curr->sum_exec_runtime += delta_exec; 868 schedstat_add(cfs_rq->exec_clock, delta_exec); 869 870 curr->vruntime += calc_delta_fair(delta_exec, curr); 871 update_min_vruntime(cfs_rq); 872 873 if (entity_is_task(curr)) { 874 struct task_struct *curtask = task_of(curr); 875 876 trace_sched_stat_runtime(curtask, delta_exec, curr->vruntime); 877 cgroup_account_cputime(curtask, delta_exec); 878 account_group_exec_runtime(curtask, delta_exec); 879 } 880 881 account_cfs_rq_runtime(cfs_rq, delta_exec); 882 } 883 884 static void update_curr_fair(struct rq *rq) 885 { 886 update_curr(cfs_rq_of(&rq->curr->se)); 887 } 888 889 static inline void 890 update_stats_wait_start_fair(struct cfs_rq *cfs_rq, struct sched_entity *se) 891 { 892 struct sched_statistics *stats; 894 895 if (!schedstat_enabled()) 896 return; 897 898 stats = __schedstats_from_se(se); 899 900 if (entity_is_task(se)) 901 p = task_of(se); 902 903 __update_stats_wait_start(rq_of(cfs_rq), p, stats); 904 } 905 906 static inline void 907 update_stats_wait_end_fair(struct cfs_rq *cfs_rq, struct sched_entity *se) 908 { 909 struct sched_statistics *stats; 910 struct task_struct *p = NULL; 911 912 if (!schedstat_enabled()) 913 return; 914 915 stats = __schedstats_from_se(se); 916 917 /* 918 * When the sched_schedstat changes from 0 to 1, some sched se 919 * maybe already in the runqueue, the se->statistics.wait_start 920 * will be 0.So it will let the delta wrong. We need to avoid this 921 * scenario. 922 */ 923 if (unlikely(!schedstat_val(stats->wait_start))) 924 return; 925 926 if (entity_is_task(se)) 927 p = task_of(se); 928 929 __update_stats_wait_end(rq_of(cfs_rq), p, stats); 930 } 931 932 static inline void 933 update_stats_enqueue_sleeper_fair(struct cfs_rq *cfs_rq, struct sched_entity *se) 934 { 935 struct sched_statistics *stats; 937 938 if (!schedstat_enabled()) 939 return; 940 941 stats = __schedstats_from_se(se); 942 943 if (entity_is_task(se)) 944 tsk = task_of(se); 945 946 __update_stats_enqueue_sleeper(rq_of(cfs_rq), tsk, stats); 947 } 948 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org