Date:   Wed, 22 Feb 2023 16:57:49 -0800
Mime-Version: 1.0
Message-ID: <20230223005754.2700663-1-axelrasmussen@google.com>
Subject: [PATCH v2 0/5] mm: userfaultfd: refactor and add UFFDIO_CONTINUE_MODE_WP
From:   Axel Rasmussen <axelrasmussen@google.com>
To:     Alexander Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        Hugh Dickins <hughd@google.com>, Jan Kara <jack@suse.cz>,
        "Liam R. Howlett" <Liam.Howlett@Oracle.com>,
        Matthew Wilcox <willy@infradead.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Mike Rapoport <rppt@kernel.org>,
        Muchun Song <muchun.song@linux.dev>,
        Nadav Amit <namit@vmware.com>, Peter Xu <peterx@redhat.com>,
        Shuah Khan <shuah@kernel.org>
Cc:     James Houghton <jthoughton@google.com>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
        Axel Rasmussen <axelrasmussen@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

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