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From: John Hubbard <jhubbard@nvidia.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Michael S . Tsirkin" <mst@redhat.com>,
	"Jason Wang" <jasowang@redhat.com>,
	"Vlastimil Babka" <vbabka@suse.cz>,
	"Jérôme Glisse" <jglisse@redhat.com>, "Jan Kara" <jack@suse.cz>,
	"Dave Chinner" <david@fromorbit.com>,
	"Souptick Joarder" <jrdr.linux@gmail.com>,
	"Jonathan Corbet" <corbet@lwn.net>,
	linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	linux-mm@kvack.org, "John Hubbard" <jhubbard@nvidia.com>
Subject: [PATCH 0/2] vhost, docs: convert to pin_user_pages(), new "case 5"
Date: Fri, 29 May 2020 16:43:07 -0700	[thread overview]
Message-ID: <20200529234309.484480-1-jhubbard@nvidia.com> (raw)

Hi,

It recently became clear to me that there are some get_user_pages*()
callers that don't fit neatly into any of the four cases that are so
far listed in pin_user_pages.rst. vhost.c is one of those.

Add a Case 5 to the documentation, and refer to that when converting
vhost.c.

Thanks to Jan Kara for helping me (again) in understanding the
interaction between get_user_pages() and page writeback [1].

This is based on today's mmotm, which has a nearby patch to
pin_user_pages.rst that rewords cases 3 and 4.

Note that I have only compile-tested the vhost.c patch, although that
does also include cross-compiling for a few other arches. Any run-time
testing would be greatly appreciated.

[1] https://lore.kernel.org/r/20200529070343.GL14550@quack2.suse.cz

John Hubbard (2):
  docs: mm/gup: pin_user_pages.rst: add a "case 5"
  vhost: convert get_user_pages() --> pin_user_pages()

 Documentation/core-api/pin_user_pages.rst | 20 ++++++++++++++++++++
 drivers/vhost/vhost.c                     |  5 ++---
 2 files changed, 22 insertions(+), 3 deletions(-)

-- 
2.26.2


             reply	other threads:[~2020-05-29 23:43 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-29 23:43 John Hubbard [this message]
2020-05-29 23:43 ` [PATCH 1/2] docs: mm/gup: pin_user_pages.rst: add a " John Hubbard
2020-05-31  7:11   ` Souptick Joarder
2020-06-01  5:11     ` John Hubbard
2020-06-12 19:24   ` Matthew Wilcox
2020-06-12 20:03     ` John Hubbard
2020-05-29 23:43 ` [PATCH 2/2] vhost: convert get_user_pages() --> pin_user_pages() John Hubbard
2020-06-01 11:30   ` Jan Kara
2020-06-02  4:22   ` Michael S. Tsirkin

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