[Nouveau] hmm_range_fault related fixes and legacy API removal v2

[Ralph Campbell]

On 7/22/19 2:44 AM, Christoph Hellwig wrote:
> Hi Jérôme, Ben and Jason,
> 
> below is a series against the hmm tree which fixes up the mmap_sem
> locking in nouveau and while at it also removes leftover legacy HMM APIs
> only used by nouveau.
> 
> The first 4 patches are a bug fix for nouveau, which I suspect should
> go into this merge window even if the code is marked as staging, just
> to avoid people copying the breakage.
> 
> Changes since v1:
>   - don't return the valid state from hmm_range_unregister
>   - additional nouveau cleanups
> 

I ran some OpenCL tests from Jerome with nouveau and this series,
5.3.0-rc1, and my two HMM fixes:
("mm/hmm: fix ZONE_DEVICE anon page mapping reuse")
("mm/hmm: Fix bad subpage pointer in try_to_unmap_one")

You can add for the series:
Tested-by: Ralph Campbell <rcampbell at nvidia.com>