Arjan> sounds like you need to redesign your layering ;) In linux
Arjan> it's common to have the lowest level driver do the mapping
Arjan> (even when the mid layer will provide the most commonly
Arjan> used helper to do it for the common case)...
It's not that simple of course...
InfiniBand allows RDMA -- _remote_ DMA. So that address might be
something that a protocol sent to the remote host and which is now
showing up for a DMA operation initiated by the remote side. And we
can't very well send a struct page * + offset to the remote side...
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