diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 008e522b9536..c5962fe3796f 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -24,9 +24,7 @@
 #include <linux/scatterlist.h>
 #include <linux/dma-mapping.h>
 #include <linux/iommu-helper.h>
-#ifdef CONFIG_IOMMU_API
 #include <linux/iommu.h>
-#endif
 #include <asm/proto.h>
 #include <asm/iommu.h>
 #include <asm/gart.h>
diff --git a/drivers/base/iommu.c b/drivers/base/iommu.c
index 5e039d4f877c..c2d1eed90376 100644
--- a/drivers/base/iommu.c
+++ b/drivers/base/iommu.c
@@ -31,7 +31,7 @@ void register_iommu(struct iommu_ops *ops)
 	iommu_ops = ops;
 }
 
-bool iommu_found()
+bool iommu_found(void)
 {
 	return iommu_ops != NULL;
 }