linux-kernel - [PATCH v2 0/2] mm/gup, media/ivtv: introduce pin_user_pages

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Message-ID: <20200531224827.769427-1-jhubbard@nvidia.com>
Date:   Sun, 31 May 2020 15:48:25 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Andy Walls <awalls@...metrocast.net>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Souptick Joarder <jrdr.linux@...il.com>,
        <linux-media@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, John Hubbard <jhubbard@...dia.com>
Subject: [PATCH v2 0/2] mm/gup, media/ivtv: introduce pin_user_pages_unlocked

Hi,

Here is a v2 that includes a small change that follows from Souptick's
review of another very similar patchset (that added
pin_user_pages_locked()) [1].

This applies on top of today's linux.git (5.7-rc7+).

Changes since v1: added an assert-and-return to the corresponding
get_user_pages_unlocked() call, to keep out any externally set
FOLL_PIN flag.

These patches are getting merged via Andrew's linux-mm tree, due to
adding a new pin_user_pages*() variant to gup.c. However, it would be
nice if anyone from IVTV or linux-media could provide some run time
testing, maybe even a Tested-by.

I've run this patchset through non-destructive xfstests, and a few
other things such as LTP. However, I'm not set up for IVTV specific
testing.

[1] https://lore.kernel.org/r/d11d52f8-d54c-bb45-bde9-198235a03921@nvidia.com

John Hubbard (2):
  mm/gup: introduce pin_user_pages_unlocked
  ivtv: convert get_user_pages() --> pin_user_pages()

 drivers/media/pci/ivtv/ivtv-udma.c | 19 ++++++-------------
 drivers/media/pci/ivtv/ivtv-yuv.c  | 17 ++++++-----------
 drivers/media/pci/ivtv/ivtvfb.c    |  4 ++--
 include/linux/mm.h                 |  2 ++
 mm/gup.c                           | 23 +++++++++++++++++++++++
 5 files changed, 39 insertions(+), 26 deletions(-)

base-commit: bdc48fa11e46f867ea4d75fa59ee87a7f48be144
-- 
2.26.2