dma_unmap_single  616 include/linux/dma-mapping.h #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
dma_unmap_single   29 tools/virtio/linux/dma-mapping.h #define dma_unmap_single(...) do { } while (0)