Note: We have tested  https://lkml.org/lkml/2019/5/6/1221, which is now on 
linux-next *, and the hi162 RoCE driver single patch usage is diminished:
$cat cma.disco.dmesg | grep "cma: cma_alloc(cma" | sed -r 's/.*count 
([0-9]+)\,.*/\1/' | sort -n | uniq -c
129 2
3   4
206 8
32  16
2   24
4   32
256 33
39  64
2   128
2   1024

I think that we had ~11K x 1K CMA pages previously, without this
patchset.

* https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-
next.git/log/kernel/dma?h=next-20190530

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https://bugs.launchpad.net/bugs/1823753

Title:
  arm64: cma_alloc errors at boot

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