hmm_range_fault related fixes and legacy API removal v2

From: Christoph Hellwig
Date: Wed Jul 03 2019 - 18:02:44 EST

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Hi JÃrÃme, 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

Next message: Greg Kurz: "[PATCH] KVM: PPC: Book3S HV: XIVE: Fix typo in comment"
Previous message: Christoph Hellwig: "[PATCH 3/6] nouveau: remove the block parameter to nouveau_range_fault"
Next in thread: Christoph Hellwig: "[PATCH 1/6] mm: always return EBUSY for invalid ranges in hmm_range_{fault,snapshot}"
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