Hi Hui, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: ee55f6a88c1f70120d9cec8244c5cd10f0c4dce9 commit: 713cfd2684fa5ea08b144d92b9858b932c0f1705 [1668/1668] sched: Introduce smart grid scheduling strategy for cfs config: x86_64-buildonly-randconfig-006-20250620 (https://download.01.org/0day-ci/archive/20251026/202510260511.Ac2yFRes-lkp@i...) compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251026/202510260511.Ac2yFRes-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/202510260511.Ac2yFRes-lkp@intel.com/ All errors (new ones prefixed by >>): kernel/sched/core.c:1587:6: warning: no previous prototype for function 'sched_set_stop_task' [-Wmissing-prototypes] 1587 | void sched_set_stop_task(int cpu, struct task_struct *stop) | ^ kernel/sched/core.c:1587:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1587 | void sched_set_stop_task(int cpu, struct task_struct *stop) | ^ | static kernel/sched/core.c:3771:35: warning: no previous prototype for function 'preempt_schedule_irq' [-Wmissing-prototypes] 3771 | asmlinkage __visible void __sched preempt_schedule_irq(void) | ^ kernel/sched/core.c:3771:22: note: declare 'static' if the function is not intended to be used outside of this translation unit 3771 | asmlinkage __visible void __sched preempt_schedule_irq(void) | ^ | static kernel/sched/core.c:5845:2: error: implicit declaration of function 'tg_update_affinity_domains' [-Werror,-Wimplicit-function-declaration] 5845 | tg_update_affinity_domains(cpu, 1); | ^ kernel/sched/core.c:5904:2: error: implicit declaration of function 'tg_update_affinity_domains' [-Werror,-Wimplicit-function-declaration] 5904 | tg_update_affinity_domains(cpu, 0); | ^ kernel/sched/core.c:5976:2: error: implicit declaration of function 'init_auto_affinity' [-Werror,-Wimplicit-function-declaration] 5976 | init_auto_affinity(&root_task_group); | ^ kernel/sched/core.c:5976:2: note: did you mean 'irq_set_affinity'? include/linux/interrupt.h:292:1: note: 'irq_set_affinity' declared here 292 | irq_set_affinity(unsigned int irq, const struct cpumask *cpumask) | ^

...

kernel/sched/core.c:5976:22: error: use of undeclared identifier 'root_task_group'; did you mean 'task_group'? 5976 | init_auto_affinity(&root_task_group); | ^~~~~~~~~~~~~~~ | task_group kernel/sched/sched.h:1444:34: note: 'task_group' declared here 1444 | static inline struct task_group *task_group(struct task_struct *p) | ^ kernel/sched/core.c:6029:32: warning: variable 'ptr' set but not used [-Wunused-but-set-variable] 6029 | unsigned long alloc_size = 0, ptr; | ^ 3 warnings and 4 errors generated.

vim +5976 kernel/sched/core.c 5949 5950 void __init sched_init_smp(void) 5951 { 5952 sched_init_numa(); 5953 5954 /* 5955 * There's no userspace yet to cause hotplug operations; hence all the 5956 * CPU masks are stable and all blatant races in the below code cannot 5957 * happen. The hotplug lock is nevertheless taken to satisfy lockdep, 5958 * but there won't be any contention on it. 5959 */ 5960 cpus_read_lock(); 5961 mutex_lock(&sched_domains_mutex); 5962 sched_init_domains(cpu_active_mask); 5963 mutex_unlock(&sched_domains_mutex); 5964 cpus_read_unlock(); 5965 5966 /* Move init over to a non-isolated CPU */ 5967 if (set_cpus_allowed_ptr(current, housekeeping_cpumask(HK_FLAG_DOMAIN)) < 0) 5968 BUG(); 5969 sched_init_granularity(); 5970 5971 init_sched_rt_class(); 5972 init_sched_dl_class(); 5973 5974 sched_smp_initialized = true; 5975

5976 init_auto_affinity(&root_task_group); 5977 } 5978

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