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Subject"Rework enabling/disabling of ATS for PCI masters" failed to compile on arm64
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The linux-next commit “iommu/arm-smmu-v3: Rework enabling/disabling of ATS for PCI masters” [1] causes a compilation error when PCI_ATS=n on arm64.

[1] https://lore.kernel.org/linux-iommu/20190820154549.17018-3-will@kernel.org/

drivers/iommu/arm-smmu-v3.c:2325:35: error: no member named 'ats_cap' in 'struct pci_dev'
return !pdev->untrusted && pdev->ats_cap;
~~~~ ^

For example,

Symbol: PCI_ATS [=n]
│ Type : bool
│ Defined at drivers/pci/Kconfig:118
│ Depends on: PCI [=y]
│ Selected by [n]:
│ - PCI_IOV [=n] && PCI [=y]
│ - PCI_PRI [=n] && PCI [=y]│
│ - PCI_PASID [=n] && PCI [=y] │
│ - AMD_IOMMU [=n] && IOMMU_SUPPORT [=y] && X86_64 && PCI [=y] && ACPI [=y]
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