Extern or forward variable declaration at include/linux/iommu.h, line 32 References: arch/arm/mm/dma-mapping.c, line 1897 arch/arm/mm/dma-mapping.c, line 2059 drivers/iommu/amd_iommu.c, line 84 drivers/iommu/amd_iommu.c, line 3476 drivers/iommu/arm-smmu.c, line 1612 drivers/iommu/exynos-iommu.c, line 1173 drivers/iommu/fsl_pamu_domain.c, line 1141 drivers/iommu/intel-iommu.c, line 454 drivers/iommu/intel-iommu.c, line 4468 drivers/iommu/iommu.c, line 519 drivers/iommu/iommu.c, line 535 drivers/iommu/iommu.c, line 535 drivers/iommu/iommu.c, line 588 drivers/iommu/iommu.c, line 607 drivers/iommu/iommu.c, line 609 drivers/iommu/iommu.c, line 612 drivers/iommu/iommu.c, line 623 drivers/iommu/iommu.c, line 655 drivers/iommu/iommu.c, line 662 drivers/iommu/ipmmu-vmsa.c, line 1123 drivers/iommu/msm_iommu.c, line 677 drivers/iommu/omap-iommu.c, line 1294 drivers/iommu/shmobile-iommu.c, line 357 drivers/iommu/tegra-gart.c, line 312 drivers/iommu/tegra-smmu.c, line 950 include/linux/iommu.h, line 32 include/linux/iommu.h, line 53 include/linux/iommu.h, line 104 include/linux/iommu.h, line 143 include/linux/iommu.h, line 238