On Fri, 2018-04-06 at 08:17 -0500, Gary R Hook wrote:
> 
> diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
> index 5eb1121d54b9..0ca250f626d9 100644
> --- a/drivers/iommu/Makefile
> +++ b/drivers/iommu/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_IOMMU_IOVA) += iova.o
>  obj-$(CONFIG_OF_IOMMU) += of_iommu.o
>  obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o
>  obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
> +obj-$(CONFIG_IOMMU_DEBUG) += amd_iommu_debugfs.o

Compiling amd_iommu_debugfs.c seems to depend only
on CONFIG_IOMMU_DEBUG. Can we prevent the code within
amd_iommu_debugfs.c from getting compiled when either CONFIG_AMD_IOMMU
or CONFIG_IOMMU_DEBUG is disabled?

>  obj-$(CONFIG_AMD_IOMMU_V2) += amd_iommu_v2.o
>  obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
>  obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o
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