Extern or forward variable declaration at include/linux/iommu.h, line 39 References: arch/arm64/kernel/setup.c, line 395 arch/arm64/kernel/setup.c, line 409 arch/arm64/mm/dma-mapping.c, line 887 arch/arm64/mm/dma-mapping.c, line 909 arch/powerpc/kernel/eeh.c, line 964 arch/powerpc/kernel/eeh.c, line 971 arch/powerpc/kernel/iommu.c, line 133 arch/powerpc/kernel/iommu.c, line 149 arch/powerpc/kernel/iommu.c, line 1131 arch/powerpc/kernel/iommu.c, line 1148 arch/powerpc/platforms/pseries/iommu.c, line 1294 arch/powerpc/platforms/pseries/iommu.c, line 1330 arch/powerpc/platforms/pseries/iommu.c, line 1334 arch/powerpc/platforms/pseries/iommu.c, line 1373 arch/x86/kvm/x86.c, line 5566 arch/x86/kvm/x86.c, line 5650 arch/x86/kvm/x86.c, line 5654 arch/x86/kvm/x86.c, line 5671 arch/x86/kvm/x86.c, line 5801 arch/x86/kvm/x86.c, line 5819 drivers/iommu/amd_iommu.c, line 3291 drivers/iommu/amd_iommu.c, line 3297 drivers/iommu/amd_iommu_v2.c, line 557 drivers/iommu/amd_iommu_v2.c, line 622 drivers/iommu/dmar.c, line 323 drivers/iommu/dmar.c, line 352 drivers/iommu/intel-iommu.c, line 4406 drivers/iommu/intel-iommu.c, line 4429 drivers/iommu/intel-iommu.c, line 4433 drivers/iommu/intel-iommu.c, line 4496 drivers/iommu/iommu.c, line 586 drivers/iommu/iommu.c, line 600 drivers/iommu/iommu.c, line 904 drivers/iommu/iommu.c, line 960 drivers/iommu/iommu.c, line 965 drivers/vfio/vfio.c, line 82 drivers/vfio/vfio.c, line 279 drivers/vfio/vfio.c, line 677 include/linux/iommu.h, line 39 include/linux/iommu.h, line 255 include/linux/iommu.h, line 257 include/linux/iommu.h, line 492 include/linux/iommu.h, line 498