hmm_range_fault related fixes and legacy API removal v2

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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 v2
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 3 Jul 2019 15:02:08 -0700
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>, linux-mm@xxxxxxxxx, nouveau@xxxxxxxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx

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.

Changes since v1:
 - don't return the valid state from hmm_range_unregister
 - additional nouveau cleanups

Follow-Ups:
- Re: hmm_range_fault related fixes and legacy API removal v2
  - From: Jason Gunthorpe
- Re: hmm_range_fault related fixes and legacy API removal v2
  - From: Jason Gunthorpe
- [PATCH 6/6] mm: remove the legacy hmm_pfn_* APIs
  - From: Christoph Hellwig
- [PATCH 4/6] nouveau: unlock mmap_sem on all errors from nouveau_range_fault
  - From: Christoph Hellwig
- [PATCH 2/6] mm: move hmm_vma_range_done and hmm_vma_fault to nouveau
  - From: Christoph Hellwig
- [PATCH 5/6] nouveau: return -EBUSY when hmm_range_wait_until_valid fails
  - From: Christoph Hellwig
- [PATCH 3/6] nouveau: remove the block parameter to nouveau_range_fault
  - From: Christoph Hellwig
- [PATCH 1/6] mm: always return EBUSY for invalid ranges in hmm_range_{fault,snapshot}
  - From: Christoph Hellwig

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