improve use_mm / unuse_mm v2

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Subject: improve use_mm / unuse_mm v2
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 16 Apr 2020 07:31:55 +0200
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Felix Kuehling <Felix.Kuehling@xxxxxxx>, Alex Deucher <alexander.deucher@xxxxxxx>, Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>, Zhi Wang <zhi.a.wang@xxxxxxxxx>, Felipe Balbi <balbi@xxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Jason Wang <jasowang@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx, intel-gvt-dev@xxxxxxxxxxxxxxxxxxxxx, intel-gfx@xxxxxxxxxxxxxxxxxxxxx, linux-usb@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, io-uring@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx

Hi all,

this series improves the use_mm / unuse_mm interface by better
documenting the assumptions, and my taking the set_fs manipulations
spread over the callers into the core API.

Changes since v1:
 - drop a few patches
 - fix a comment typo
 - cover the newly merged use_mm/unuse_mm caller in vfio

Follow-Ups:
- Re: improve use_mm / unuse_mm v2
  - From: Jens Axboe
- Re: improve use_mm / unuse_mm v2
  - From: Matthew Wilcox
- [PATCH 3/3] kernel: set USER_DS in kthread_use_mm
  - From: Christoph Hellwig
- [PATCH 1/3] kernel: move use_mm/unuse_mm to kthread.c
  - From: Christoph Hellwig
- [PATCH 2/3] kernel: better document the use_mm/unuse_mm API contract
  - From: Christoph Hellwig

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