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All drivers are now using IDENTITY or PLATFORM domains for what this did, we can remove it now. It is no longer possible to attach to a NULL domain. Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Niklas Schnelle <schnelle@linux.ibm.com> Tested-by: Steven Price <steven.price@arm.com> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/15-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com Signed-off-by: Joerg Roedel <jroedel@suse.de>