Anthony Liguori wrote:
I Wouldn't be surprised if some machines had a large memory mapped IO
space. Most of it might not be actively used, but once you start
considering 64-bit machines on 32-bit hosts these allocations would
become problematic.
At some level, any DMA API would fall apart here. Certain IO
operations simply cannot be split (such as network send). If you pass
don't pass a flag to the map function that says you can handle partial
results, you must cope with map() returning NULL (by dropping the
packet).
... and then you must cope with it. In all non-network dma clients. Or
in the dma api.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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