1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 136a76d80dbf..18a6966567da 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1173,6 +1173,10 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
         WARN_ON_ONCE(debug_locks && !(lockdep_is_held(&p->pi_lock) ||
                                       lockdep_is_held(&task_rq(p)->lock)));
 #endif
+        /*
+         * Clearly, migrating tasks to offline CPUs is a fairly daft thing.
+         */
+        WARN_ON_ONCE(!cpu_online(new_cpu));
 #endif
 
         trace_sched_migrate_task(p, new_cpu);