On 06/11/21 13:05, kernel test robot wrote:
>    kernel/sched/core.c:3439:6: error: no previous prototype for function 'sched_set_stop_task' [-Werror,-Wmissing-prototypes]
>    void sched_set_stop_task(int cpu, struct task_struct *stop)
>         ^
>    kernel/sched/core.c:3439:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>    void sched_set_stop_task(int cpu, struct task_struct *stop)
>    ^
>    static
>>> kernel/sched/core.c:6576:2: error: use of undeclared identifier '__SCT__preempt_schedule'
>            static_call_update(preempt_schedule, __preempt_schedule_func);
>            ^

Doh, I broke the

  PREEMPT_DYNAMIC
    select PREEMPT

thing - the above happens with PREEMPT_DYNAMIC && !PREEMPT. Lemme fix.