diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index fb99a73d0d9f92f98b2fb2bcdb056b0e147b2d92..6f4b48ba7a5cb30160bc8c55e1c9989456342935 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -26,8 +26,6 @@
 
 #ifdef CONFIG_IRQ_REMAP
 
-extern int irq_remapping_enabled;
-
 extern void setup_irq_remapping_ops(void);
 extern int irq_remapping_supported(void);
 extern int irq_remapping_prepare(void);
@@ -49,8 +47,6 @@ extern void panic_if_irq_remap(const char *msg);
 
 #else  /* CONFIG_IRQ_REMAP */
 
-#define irq_remapping_enabled	0
-
 static inline void setup_irq_remapping_ops(void) { }
 static inline int irq_remapping_supported(void) { return 0; }
 static inline int irq_remapping_prepare(void) { return -ENODEV; }
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 86e2f4a62b9a95fed887dda18b6bd5bdd2cdacda..174bb654453de7e4ece57f1e0807a48bd85122e5 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -41,6 +41,8 @@
 #include <asm/irq_remapping.h>
 #include <asm/iommu_table.h>
 
+#include "irq_remapping.h"
+
 /* No locks are needed as DMA remapping hardware unit
  * list is constructed at boot time and hotplug of
  * these units are not supported by the architecture.
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index b9d091157884570f636492be2e49e2e346697664..64ae948a3802f8995e0a57e6e628cc5e43bf1ef0 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -46,6 +46,8 @@
 #include <asm/cacheflush.h>
 #include <asm/iommu.h>
 
+#include "irq_remapping.h"
+
 #define ROOT_SIZE		VTD_PAGE_SIZE
 #define CONTEXT_SIZE		VTD_PAGE_SIZE
 
diff --git a/drivers/iommu/irq_remapping.h b/drivers/iommu/irq_remapping.h
index 95363acb583fe3613a7d82bbbf7255ea1455c6eb..ecb63767040553b16fa8c469f48a10799c6e8e18 100644
--- a/drivers/iommu/irq_remapping.h
+++ b/drivers/iommu/irq_remapping.h
@@ -34,6 +34,7 @@ struct msi_msg;
 extern int disable_irq_remap;
 extern int disable_sourceid_checking;
 extern int no_x2apic_optout;
+extern int irq_remapping_enabled;
 
 struct irq_remap_ops {
 	/* Check whether Interrupt Remapping is supported */