Comment 0 for bug 1823753

On some arm64 systems[*] we are seeing a spew of messages on the console:

[ 19.534097] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534109] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534113] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534126] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534130] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534142] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534146] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534157] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534161] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534173] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534177] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12

This appears to be non-fatal - impacted systems all eventually boot. But, at least in the case of the HP m400, it slows down boot enough that MAAS' default timeout will expire before completing deployment.

[*] Observed on a HiSilicon D06 w/ SMMU disabled in the BIOS, as well as an HP m400 (APM X-Gene) cartridge - although, not on another one that - in theory - should be identical.