Re: [PATCH v3 3/3] iommu/tegra-smmu: Add PCI support

[Dmitry Osipenko]

...
> +#ifdef CONFIG_PCI
> +	if (!iommu_present(&pci_bus_type)) {


In the previous reply you said that you're borrowing this check from the
arm-smmu driver, but arm-smmu also has a similar check for
platform_bus_type, while Tegra SMMU driver doesn't have it. Hence I'm
objecting the necessity of having this check.

Please give a rationale for having this check in the code. And please
note that cargo cult isn't a rationale to me.