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CMA allocation issues and vc4 crash with 4.10 rc 2/3 #76

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@nullr0ute

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@nullr0ute

On a vanilla 4.8.x (Fedora 25) and 4.9 kernels with mesa 13.0.x (currently 13.0.3) we use to get the occasional alloc_contig_range logged in the dmesg but there weren't particularly huge amounts of them. Now with 4.10 rc3 we're seeing a large amount of them as well as vc4 crashes.

The "alloc_contig_range: [2191e, 2191f) PFNs busy" errors were thought to be harmless but with the increased amount in 4.10 combined with the VC4 crashes I'm not so sure. The messages fill up the dmesg buffer.

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