Hi Zhang, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 1e531b8351b843cd4a160764c0f67e4c9805234d commit: 926b9b0cd97e640ee680347cf449c3dc152dddd2 [1682/1682] sched: Throttle qos cfs_rq when current cpu is running online task config: x86_64-randconfig-121-20250101 (https://download.01.org/0day-ci/archive/20250101/202501010909.j7gDYmAD-lkp@i...) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250101/202501010909.j7gDYmAD-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202501010909.j7gDYmAD-lkp@intel.com/ All errors (new ones prefixed by >>): In file included from include/linux/export.h:5, from include/linux/linkage.h:7, from include/linux/kernel.h:17, from include/linux/cpumask.h:10, from include/linux/energy_model.h:4, from kernel/sched/fair.c:23: kernel/sched/fair.c: In function 'check_qos_cfs_rq':

...

kernel/sched/fair.c:8325:23: error: implicit declaration of function 'sched_idle_cpu'; did you mean 'sched_idle_rq'? [-Werror=implicit-function-declaration] 8325 | !sched_idle_cpu(smp_processor_id()) && | ^~~~~~~~~~~~~~ include/linux/compiler.h:77:45: note: in definition of macro 'unlikely' 77 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ kernel/sched/fair.c:8328:35: error: 'struct rq' has no member named 'online' 8328 | if (!rq_of(cfs_rq)->online) | ^~ kernel/sched/fair.c: In function 'pick_next_task_fair': kernel/sched/fair.c:8531:19: error: 'struct rq' has no member named 'idle_stamp' 8531 | rq->idle_stamp = 0; | ^~ kernel/sched/fair.c: At top level: kernel/sched/fair.c:8166:13: warning: 'start_qos_hrtimer' used but never defined 8166 | static void start_qos_hrtimer(int cpu); | ^~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors

vim +8325 kernel/sched/fair.c 8321 8322 static bool check_qos_cfs_rq(struct cfs_rq *cfs_rq) 8323 { 8324 if (unlikely(cfs_rq && cfs_rq->tg->qos_level < 0 &&

8325 !sched_idle_cpu(smp_processor_id()) && 8326 cfs_rq->h_nr_running == cfs_rq->idle_h_nr_running)) { 8327 8328 if (!rq_of(cfs_rq)->online) 8329 return false; 8330 8331 throttle_qos_cfs_rq(cfs_rq); 8332 return true; 8333 } 8334 8335 return false; 8336 } 8337

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