diff --git a/block/blk-mq.c b/block/blk-mq.c
index 8e01e4b32e10..579921a2f1c6 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3545,12 +3545,28 @@ static int blk_mq_hctx_notify_offline(unsigned int cpu, struct hlist_node *node)
 	return 0;
 }
 
+/*
+ * Check if one CPU is mapped to the specified hctx
+ *
+ * Isolated CPUs have been ruled out from hctx->cpumask, which is supposed
+ * to be used for scheduling kworker only. For other usage, please call this
+ * helper for checking if one CPU belongs to the specified hctx
+ */
+static bool blk_mq_cpu_mapped_to_hctx(unsigned int cpu,
+		const struct blk_mq_hw_ctx *hctx)
+{
+	struct blk_mq_hw_ctx *mapped_hctx = blk_mq_map_queue_type(hctx->queue,
+			hctx->type, cpu);
+
+	return mapped_hctx == hctx;
+}
+
 static int blk_mq_hctx_notify_online(unsigned int cpu, struct hlist_node *node)
 {
 	struct blk_mq_hw_ctx *hctx = hlist_entry_safe(node,
 			struct blk_mq_hw_ctx, cpuhp_online);
 
-	if (cpumask_test_cpu(cpu, hctx->cpumask))
+	if (blk_mq_cpu_mapped_to_hctx(cpu, hctx))
 		clear_bit(BLK_MQ_S_INACTIVE, &hctx->state);
 	return 0;
 }
@@ -3568,7 +3584,7 @@ static int blk_mq_hctx_notify_dead(unsigned int cpu, struct hlist_node *node)
 	enum hctx_type type;
 
 	hctx = hlist_entry_safe(node, struct blk_mq_hw_ctx, cpuhp_dead);
-	if (!cpumask_test_cpu(cpu, hctx->cpumask))
+	if (!blk_mq_cpu_mapped_to_hctx(cpu, hctx))
 		return 0;
 
 	ctx = __blk_mq_get_ctx(hctx->queue, cpu);