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The way wakeup_preempt() works since commit704069649b("sched/core: Rework sched_class::wakeup_preempt() and rq_modified_*()") is that it will call rq->next_class->wakeup_preempt(rq, p) when p is of an equal or higher class, and raise ->next_class when higher. This means that: running idle task wakeup fair-A (next_class == idle) if (sched_class_above(fair, idle)) { wakeup_preempt_idle(fair-A); resched_curr(rq); next_class = fair; } wakeup fair-B (next_class == fair) if (fair == fair) wakeup_preempt_fair(fair-B); (but current is idle) All wakeup_preempt_$class() methods, except for wakeup_preempt_scx() (for whoem this was build) ignore cross-class wakeups by testing if @p is of the right class, but per the above case, it also should check current. This is mostly harmless in the current form, but will lead to trouble with later patches. Fixes:704069649b("sched/core: Rework sched_class::wakeup_preempt() and rq_modified_*()") Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://patch.msgid.link/20260626074605.GB2568396%40noisy.programming.kicks-ass.net