| From: |
| Axel Rasmussen <axelrasmussen-AT-google.com> |
| To: |
| Alexander Viro <viro-AT-zeniv.linux.org.uk>, Andrew Morton <akpm-AT-linux-foundation.org>, Hugh Dickins <hughd-AT-google.com>, Jan Kara <jack-AT-suse.cz>, "Liam R. Howlett" <Liam.Howlett-AT-Oracle.com>, Matthew Wilcox <willy-AT-infradead.org>, Mike Kravetz <mike.kravetz-AT-oracle.com>, Mike Rapoport <rppt-AT-kernel.org>, Muchun Song <muchun.song-AT-linux.dev>, Nadav Amit <namit-AT-vmware.com>, Peter Xu <peterx-AT-redhat.com>, Shuah Khan <shuah-AT-kernel.org> |
| Subject: |
| [PATCH v4 0/4] mm: userfaultfd: refactor and add UFFDIO_CONTINUE_MODE_WP |
| Date: |
| Wed, 08 Mar 2023 14:19:28 -0800 |
| Message-ID: |
| <20230308221932.1548827-1-axelrasmussen@google.com> |
| Cc: |
| James Houghton <jthoughton-AT-google.com>, linux-fsdevel-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, linux-mm-AT-kvack.org, linux-kselftest-AT-vger.kernel.org, Axel Rasmussen <axelrasmussen-AT-google.com> |
| Archive-link: |
| Article |
This series, currently based on 6.3-rc1, is divided into two parts:
- Commits 1-3 refactor userfaultfd ioctl code without behavior changes, with the
main goal of improving consistency and reducing the number of function args.
- Commit 4 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:
v3->v4:
- massage the uffd_flags_t implementation to eliminate all sparse warnings
- add a couple inline helpers to make uffd_flags_t usage easier
- drop the refactor passing `struct uffdio_range *` around (previously 4/5)
- define a temporary `struct mm_struct *` in function with >=3 `vma->vm_mm`
- consistent argument order between `flags` and `pagep`
- expand on the use case in patch 4/4 message
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 (4):
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: add UFFDIO_CONTINUE_MODE_WP to install WP PTEs
fs/userfaultfd.c | 29 ++--
include/linux/hugetlb.h | 27 ++--
include/linux/shmem_fs.h | 9 +-
include/linux/userfaultfd_k.h | 68 +++++----
include/uapi/linux/userfaultfd.h | 7 +
mm/hugetlb.c | 28 ++--
mm/shmem.c | 14 +-
mm/userfaultfd.c | 170 +++++++++++------------
tools/testing/selftests/mm/userfaultfd.c | 4 +
9 files changed, 187 insertions(+), 169 deletions(-)
--
2.40.0.rc1.284.g88254d51c5-goog
