linux-kernel - [PATCH v2 0/5] mm: userfaultfd: refactor and add UFFDIO_CONTINUE_MODE

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Date:   Wed, 22 Feb 2023 16:57:49 -0800
From:   Axel Rasmussen <axelrasmussen@...gle.com>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...nel.org>,
        Muchun Song <muchun.song@...ux.dev>,
        Nadav Amit <namit@...are.com>, Peter Xu <peterx@...hat.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     James Houghton <jthoughton@...gle.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        Axel Rasmussen <axelrasmussen@...gle.com>
Subject: [PATCH v2 0/5] mm: userfaultfd: refactor and add UFFDIO_CONTINUE_MODE_WP

This series, currently based on 6.2, is divided into two parts:

- Commits 1-4 refactor userfaultfd ioctl code without behavior changes, with the
  main goal of improving consistency and reducing the number of function args.
- Commit 5 adds UFFDIO_CONTINUE_MODE_WP.

The refactors are sorted by increasing controversial-ness, the idea being we
could drop some of the refactors if they are deemed not worth it.

Changelog:
v1->v2: refactor before adding the new flag, to avoid perpetuating messiness

Axel Rasmussen (5):
  mm: userfaultfd: rename functions for clarity + consistency
  mm: userfaultfd: don't pass around both mm and vma
  mm: userfaultfd: combine 'mode' and 'wp_copy' arguments
  mm: userfaultfd: don't separate addr + len arguments
  mm: userfaultfd: add UFFDIO_CONTINUE_MODE_WP to install WP PTEs

 fs/userfaultfd.c                         | 121 +++++-------
 include/linux/hugetlb.h                  |  28 ++-
 include/linux/shmem_fs.h                 |   8 +-
 include/linux/userfaultfd_k.h            |  57 +++---
 include/uapi/linux/userfaultfd.h         |   7 +
 mm/hugetlb.c                             |  35 ++--
 mm/shmem.c                               |  13 +-
 mm/userfaultfd.c                         | 236 +++++++++++------------
 tools/testing/selftests/vm/userfaultfd.c |   4 +
 9 files changed, 245 insertions(+), 264 deletions(-)

--
2.39.2.637.g21b0678d19-goog