• C
    isci: simplify dma coherent allocation · bc5c9674
    Christoph Hellwig 提交于
    Remove the insane infrastructure for preallocating coheren DMA regions,
    and just allocate the memory where needed.  This also gets rid of the
    aligment adjustments given that Documentation/DMA-API-HOWTO.txt sais:
    
      "The cpu return address and the DMA bus master address are both
       guaranteed to be aligned to the smallest PAGE_SIZE order which
       is greater than or equal to the requested size.  This invariant
       exists (for example) to guarantee that if you allocate a chunk
       which is smaller than or equal to 64 kilobytes, the extent of the
       buffer you receive will not cross a 64K boundary."
    Signed-off-by: NChristoph Hellwig <hch@lst.de>
    [djbw: moved allocation from start to init, re-add memset]
    Signed-off-by: NDan Williams <dan.j.williams@intel.com>
    bc5c9674
Makefile 1.0 KB