linux-kernel - hmm_range_fault related fixes and legacy API removal v3

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Message-Id: <20190724065258.16603-1-hch@lst.de>
Date:   Wed, 24 Jul 2019 08:52:51 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>
Cc:     Ralph Campbell <rcampbell@...dia.com>, linux-mm@...ck.org,
        nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: hmm_range_fault related fixes and legacy API removal v3

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

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