linux-kernel - [PULL] topic/iomem-mmap-vs-gup

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Date:   Mon, 3 May 2021 21:15:08 +0200
From:   Daniel Vetter <daniel.vetter@...ll.ch>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org
Subject: [PULL] topic/iomem-mmap-vs-gup

Hi Linus,

It's still the same topic branch as last merge window, but the name isn't
fitting all that well anymore :-)

Anyway here's a small pull for you to ponder, now that the big ones are
all through. It's been in -next almost the entire cycle, I've only done
some non-code rebases due to the -rc1 fumble and to fix some commit
message typos.

Christoph Hellwig also looked at these and aside from wanting to outright
remove it all didn't have objections.

topic/iomem-mmap-vs-gup-2021-05-03:
unexport follow_pfn

Follow-up to my pull from last merge window: kvm and vfio lost their
very unsafe use of follow_pfn, this appropriately marks up the very
last user for some userptr-as-buffer use-cases in media. There was
some resistance to outright removing it, maybe we can do this in a few
releases.

Cheers, Daniel

The following changes since commit 0d02ec6b3136c73c09e7859f0d0e4e2c4c07b49b:

  Linux 5.12-rc4 (2021-03-21 14:56:43 -0700)

are available in the Git repository at:

  git://anongit.freedesktop.org/drm/drm tags/topic/iomem-mmap-vs-gup-2021-05-03

for you to fetch changes up to ac8b8400620a4b0d9ca903ee9ad440bec736f5fa:

  mm: unexport follow_pfn (2021-04-08 16:54:38 +0200)

----------------------------------------------------------------
unexport follow_pfn

Follow-up to my pull from last merge window: kvm and vfio lost their
very unsafe use of follow_pfn, this appropriately marks up the very
last user for some userptr-as-buffer use-cases in media. There was
some resistance to outright removing it, maybe we can do this in a few
releases.

----------------------------------------------------------------
Daniel Vetter (3):
      mm: Add unsafe_follow_pfn
      media/videobuf1|2: Mark follow_pfn usage as unsafe
      mm: unexport follow_pfn

 drivers/media/common/videobuf2/frame_vector.c |  2 +-
 drivers/media/v4l2-core/videobuf-dma-contig.c |  2 +-
 include/linux/mm.h                            |  4 +--
 mm/memory.c                                   | 46 +++++++++++++++++----------
 mm/nommu.c                                    | 28 ++++++++++++----
 security/Kconfig                              | 13 ++++++++
 6 files changed, 68 insertions(+), 27 deletions(-)

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch