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Invalid pages can be the result of pages that have been migrated already due to copy-on-write procedure or pages that were never migrated to VRAM in first place. This is not an issue anymore, as pranges now support mixed memory domains (CPU/GPU). Signed-off-by: Alex Sierra <alex.sierra@amd.com> Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>