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252891d03d
scx_rcu_cpu_stall() previously recorded the detector CPU rather than the stalled one, and the expedited grace period path had no stalled CPU to report at all. Thread a cpumask through panic_on_rcu_stall() and scx_rcu_cpu_stall() to capture all stalled CPUs. Report cpumask_first() as exit_cpu and the full CPU list in the exit message. Task-only stalls yield exit_cpu = -1. Store the stall mask in scx_sched rather than scx_exit_info, keeping the BPF-visible struct unchanged. scx_dump_state() reads sch->stall_cpus directly and dumps all stalled CPUs first to avoid losing them to truncation. Signed-off-by: Cheng-Yang Chou <yphbchou0911@gmail.com> Reviewed-by: Paul E. McKenney <paulmck@kernel.org> Reviewed-by: Andrea Righi <arighi@nvidia.com> Signed-off-by: Tejun Heo <tj@kernel.org>