quoted

Really? It's used all over the stack...

So the suggestion is to restrict the allocation does not
cross the page boundary (which can easily be done with making
MLX4_MR_PAGES_ALIGN be PAGE_SIZE or larger than PAGE_SIZE/2)?

We could simply switch to alloc_pages, e.g. something like the patch below:

Patch below? :)

But I have to admit I really like the coherent dma mapping version,
for all sane architectures that works much better, although it sucks
for some architetures where dma coherent mappings cause a bit of
overhead.

But this is specific to mlx4 which supports up 511 pages per MR, mlx5
will need a coherent allocation anyways right (it supports up to 64K
pages per MR)?
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