diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index b4d39507681a413041f65e7a35d6d74b56bb6030..1c0255e4ff29e36950d5b86e0f45cf4d9b13d2f0 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -902,6 +902,7 @@ static int intel_setup_ioapic_entry(int irq,
 	return 0;
 }
 
+#ifdef CONFIG_SMP
 /*
  * Migrate the IO-APIC irq in the presence of intr-remapping.
  *
@@ -955,6 +956,7 @@ intel_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	cpumask_copy(data->affinity, mask);
 	return 0;
 }
+#endif
 
 static void intel_compose_msi_msg(struct pci_dev *pdev,
 				  unsigned int irq, unsigned int dest,
@@ -1056,7 +1058,9 @@ struct irq_remap_ops intel_irq_remap_ops = {
 	.reenable		= reenable_irq_remapping,
 	.enable_faulting	= enable_drhd_fault_handling,
 	.setup_ioapic_entry	= intel_setup_ioapic_entry,
+#ifdef CONFIG_SMP
 	.set_affinity		= intel_ioapic_set_affinity,
+#endif
 	.free_irq		= free_irte,
 	.compose_msi_msg	= intel_compose_msi_msg,
 	.msi_alloc_irq		= intel_msi_alloc_irq,
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 1cf350e02da8a27a33ff82380624b5085ff58395..40cda8e98d8748a59fdd47b533445e0ba259e7a2 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -111,6 +111,7 @@ int setup_ioapic_remapped_entry(int irq,
 					     vector, attr);
 }
 
+#ifdef CONFIG_SMP
 int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 			      bool force)
 {
@@ -119,6 +120,7 @@ int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 
 	return remap_ops->set_affinity(data, mask, force);
 }
+#endif
 
 void free_remapped_irq(int irq)
 {
diff --git a/drivers/iommu/irq_remapping.h b/drivers/iommu/irq_remapping.h
index b12974cc1dfe73be3b4366651c26382f1ef8ea23..be9d72950c519d422f8114a0981d6e3594f5b5d7 100644
--- a/drivers/iommu/irq_remapping.h
+++ b/drivers/iommu/irq_remapping.h
@@ -59,9 +59,11 @@ struct irq_remap_ops {
 				  unsigned int, int,
 				  struct io_apic_irq_attr *);
 
+#ifdef CONFIG_SMP
 	/* Set the CPU affinity of a remapped interrupt */
 	int (*set_affinity)(struct irq_data *data, const struct cpumask *mask,
 			    bool force);
+#endif
 
 	/* Free an IRQ */
 	int (*free_irq)(int);