dma_alloc_from_dev_coherent  171 include/linux/dma-mapping.h #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
dma_alloc_from_dev_coherent  172 kernel/dma/coherent.c int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,