In general dma_alloc_coherent() return a CPU virtual address and
a DMA address, and we have no guarantee that the virtual address
is either in the linear map or vmalloc, and not some other special
place. we have no guarantee that the underlying memory even has
an associated struct page at all.
In
In general dma_alloc_coherent() return a CPU virtual address and
a DMA address, and we have no guarantee that the virtual address
is either in the linear map or vmalloc, and not some other special
place. we have no guarantee that the underlying memory even has
an associated struct page at all.
In
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