[PATCH v3 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>
Subject: [PATCH v3 0/5] mm: userfaultfd: refactor and add UFFDIO_CONTINUE_MODE_WP
Date: Mon,  6 Mar 2023 14:50:19 -0800	[thread overview]
Message-ID: <20230306225024.264858-1-axelrasmussen@google.com> (raw)

This series, currently based on 6.3-rc1, 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:

v2->v3:
 - rebase onto 6.3-rc1
 - typedef a new type for mfill flags in patch 3/5 (suggested by Nadav)

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                         | 120 +++++-------
 include/linux/hugetlb.h                  |  27 ++-
 include/linux/shmem_fs.h                 |   9 +-
 include/linux/userfaultfd_k.h            |  61 +++---
 include/uapi/linux/userfaultfd.h         |   7 +
 mm/hugetlb.c                             |  34 ++--
 mm/shmem.c                               |  14 +-
 mm/userfaultfd.c                         | 235 +++++++++++------------
 tools/testing/selftests/mm/userfaultfd.c |   4 +
 9 files changed, 247 insertions(+), 264 deletions(-)

--
2.40.0.rc0.216.gc4246ad0f0-goog