diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 463ba50f9fff..e3efc40349f1 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -3154,7 +3154,7 @@ void dl_add_task_root_domain(struct task_struct *p)
 	struct rq *rq;
 	struct dl_bw *dl_b;
 	unsigned int cpu;
-	struct cpumask *msk = this_cpu_cpumask_var_ptr(local_cpu_mask_dl);
+	struct cpumask *msk;
 
 	raw_spin_lock_irqsave(&p->pi_lock, rf.flags);
 	if (!dl_task(p) || dl_entity_is_special(&p->dl)) {
@@ -3162,6 +3162,7 @@ void dl_add_task_root_domain(struct task_struct *p)
 		return;
 	}
 
+	msk = this_cpu_cpumask_var_ptr(local_cpu_mask_dl);
 	dl_get_task_effective_cpus(p, msk);
 	cpu = cpumask_first_and(cpu_active_mask, msk);
 	BUG_ON(cpu >= nr_cpu_ids);