hmm_range_fault related fixes and legacy API removal

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To: Jérôme Glisse <jglisse@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxxxxxx>, Ben Skeggs <bskeggs@xxxxxxxxxx>
Subject: hmm_range_fault related fixes and legacy API removal
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 3 Jul 2019 11:44:57 -0700
Cc: linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, nouveau@xxxxxxxxxxxxxxxxxxxxx

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.
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Follow-Ups:
- [PATCH 5/5] mm: remove the legacy hmm_pfn_* APIs
  - From: Christoph Hellwig
- [PATCH 4/5] nouveau: unlock mmap_sem on all errors from nouveau_range_fault
  - From: Christoph Hellwig
- [PATCH 1/5] mm: return valid info from hmm_range_unregister
  - From: Christoph Hellwig
- [PATCH 3/5] mm: move hmm_vma_fault to nouveau
  - From: Christoph Hellwig
- [PATCH 2/5] mm: always return EBUSY for invalid ranges in hmm_range_{fault, snapshot}
  - From: Christoph Hellwig

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