hmm_range_fault related fixes and legacy API removal v3

[Ralph Campbell]

On 7/25/19 5:16 PM, Jason Gunthorpe wrote:
> On Wed, Jul 24, 2019 at 08:52:51AM +0200, 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 v2:
>>   - new patch from Jason to document FAULT_FLAG_ALLOW_RETRY semantics
>>     better
>>   - remove -EAGAIN handling in nouveau earlier
> 
> I don't see Ralph's tested by, do you think it changed enough to
> require testing again? If so, Ralph would you be so kind?
> 
> In any event, I'm sending this into linux-next and intend to forward
> the first four next week.
> 
> Thanks,
> Jason
> 

I have been testing Christoph's v3 with my set of v2 changes so
feel free to add my tested-by.