PM_LEVEL_SHIFT 271 drivers/iommu/amd_iommu_types.h ((1ULL << PM_LEVEL_SHIFT((x))) - 1): \ PM_LEVEL_SHIFT 273 drivers/iommu/amd_iommu_types.h #define PM_LEVEL_INDEX(x, a) (((a) >> PM_LEVEL_SHIFT((x))) & 0x1ffULL)