linux-kernel - [PATCH v5 0/5] mm/gup: some cleanups

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Date:   Sun, 6 Feb 2022 22:22:08 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Peter Xu <peterx@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>
CC:     David Hildenbrand <david@...hat.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH v5 0/5] mm/gup: some cleanups

Hi,

Here's an update, mainly just collecting reviewed-by tags:

Changes since v4:

    * Patch 1: reflowed the commit description to 72 columns.

    * Added reviewed-by's from Christoph and Jan for remaining patches.

    * Rebased onto 5.17-rc3.


Changes since v3:

    * Patch 1: Commit log: removed a reference to an out of tree module,
      and updated tags and added a short note to that effect.

    * Patch 2: Fixed up do_move_pages(), to squash -EEXIST returns from
      follow_page() into something that move_pages() allows: -EFAULT.
      This is from reviews by Jan Kara, Matthew Wilcox, Jason Gunthorpe.

      Removed all Reviewed-by tags for this patch, due to that update.

    * Patch 4: Split into two patches, as recommended by Christoph
      Hellwig. Left the Reviewed-by tags intact because no code changes
      were required.

    * Added Reviewed-by tags from Claudio Imbrenda.

Changes since v2:

    * Patch 2: Removed an unnecessary line that was causing a
      clang-analyzer complaint, as reported by Lukas Bulwahn
      [1] (thanks!), and retested locally.

      Jason: I've boldly left your Reviewed-by tag on this patch,
      because I am predicting you'll agree with it...

    * Added Reviewed-by tags from Jan Kara, Christoph Hellwig, and
      Jason Gunthorpe that have collected since v2.


Changes since v1:
    * Patch 4: changed from get_user_pages(), to get_user_pages_fast().

    * Patch 4: Rewrote the commit description--thanks to Jan Kara for
               that feedback.

    * Patch 1: Removed Jerome's Cc from patch 1, due to a stale email
               address.

    * Added Reviewed-by's from David Hildenbrand and Jason Gunthorpe.

Original cover letter, updated as necessary:

I'm including Peter's patch as the first one in this tiny series. (The
commit description has my r-b tag in place of my Cc, and removes
Jerome's Cc because he is no longer at redhat.com) The second patch is
what I had in mind for a follow-up to that, when we were discussing that
fix [2].

Plus, a couple more small removals that I had queued up:

The third patch removes a completely unused routine:
pin_user_pages_locked().

The forth patch removes a similar routine, get_user_pages_locked(), that
only has one caller. It now calls get_user_pages_fast(), instead.

v1 of this patchset is here:
https://lore.kernel.org/all/20220131051752.447699-1-jhubbard@nvidia.com/

v2:
https://lore.kernel.org/r/20220201101108.306062-1-jhubbard@nvidia.com

v3:
https://lore.kernel.org/r/20220203093232.572380-1-jhubbard@nvidia.com

v4:
https://lore.kernel.org/r/20220204020010.68930-1-jhubbard@nvidia.com


[1] https://lore.kernel.org/r/CAKXUXMxFK9bo8jDoRZbQ0r2j-JwAGg3Xc5cpAcLaHfwHddJ7ew@mail.gmail.com

[2] https://lore.kernel.org/all/20220125033700.69705-1-peterx@redhat.com/


John Hubbard (4):
  mm/gup: follow_pfn_pte(): -EEXIST cleanup
  mm/gup: remove unused pin_user_pages_locked()
  mm: change lookup_node() to use get_user_pages_fast()
  mm/gup: remove unused get_user_pages_locked()

Peter Xu (1):
  mm: Fix invalid page pointer returned with FOLL_PIN gups

 include/linux/mm.h |   4 --
 mm/gup.c           | 101 ++++-----------------------------------------
 mm/mempolicy.c     |  21 ++++------
 mm/migrate.c       |   7 ++++
 4 files changed, 24 insertions(+), 109 deletions(-)


base-commit: dfd42facf1e4ada021b939b4e19c935dcdd55566
-- 
2.35.1