Hi Yuyang, [auto build test WARNING on tip/sched/core] [also build test WARNING on v4.4-rc5 next-20151216]
url: https://github.com/0day-ci/linux/commits/Yuyang-Du/sched-Fix-new-task-s-load-avg-removed-from-source-CPU-in/20151216-154529 config: i386-randconfig-x000-12141102 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): kernel/sched/fair.c: In function 'remove_entity_load_avg': >> kernel/sched/fair.c:2919:2: warning: ISO C90 forbids mixed declarations and >> code [-Wdeclaration-after-statement] u64 last_update_time_copy; ^ vim +2919 kernel/sched/fair.c 9ee474f5 Paul Turner 2012-10-04 2903 /* 9d89c257 Yuyang Du 2015-07-15 2904 * Task first catches up with cfs_rq, and then subtract 9d89c257 Yuyang Du 2015-07-15 2905 * itself from the cfs_rq (task must be off the queue now). 9ee474f5 Paul Turner 2012-10-04 2906 */ 9d89c257 Yuyang Du 2015-07-15 2907 void remove_entity_load_avg(struct sched_entity *se) 2dac754e Paul Turner 2012-10-04 2908 { 9d89c257 Yuyang Du 2015-07-15 2909 struct cfs_rq *cfs_rq = cfs_rq_of(se); 9d89c257 Yuyang Du 2015-07-15 2910 u64 last_update_time; 9d89c257 Yuyang Du 2015-07-15 2911 a13869ac Yuyang Du 2015-12-16 2912 /* a13869ac Yuyang Du 2015-12-16 2913 * Newly created task should not be removed from the source CPU before migration a13869ac Yuyang Du 2015-12-16 2914 */ a13869ac Yuyang Du 2015-12-16 2915 if (se->avg.last_update_time == 0) a13869ac Yuyang Du 2015-12-16 2916 return; a13869ac Yuyang Du 2015-12-16 2917 9d89c257 Yuyang Du 2015-07-15 2918 #ifndef CONFIG_64BIT 9d89c257 Yuyang Du 2015-07-15 @2919 u64 last_update_time_copy; 9ee474f5 Paul Turner 2012-10-04 2920 9d89c257 Yuyang Du 2015-07-15 2921 do { 9d89c257 Yuyang Du 2015-07-15 2922 last_update_time_copy = cfs_rq->load_last_update_time_copy; 9d89c257 Yuyang Du 2015-07-15 2923 smp_rmb(); 9d89c257 Yuyang Du 2015-07-15 2924 last_update_time = cfs_rq->avg.last_update_time; 9d89c257 Yuyang Du 2015-07-15 2925 } while (last_update_time != last_update_time_copy); 9d89c257 Yuyang Du 2015-07-15 2926 #else 9d89c257 Yuyang Du 2015-07-15 2927 last_update_time = cfs_rq->avg.last_update_time; :::::: The code at line 2919 was first introduced by commit :::::: 9d89c257dfb9c51a532d69397f6eed75e5168c35 sched/fair: Rewrite runnable load and utilization average tracking :::::: TO: Yuyang Du <yuyang...@intel.com> :::::: CC: Ingo Molnar <mi...@kernel.org> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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