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:
v4->v5: - rename "uffd_flags_has_mode" to "uffd_flags_mode_is" - modify "uffd_flags_set_mode" to clear mode bits before setting new mode - update userfaultfd documentation to describe new mode flag
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
Documentation/admin-guide/mm/userfaultfd.rst | 8 + fs/userfaultfd.c | 29 ++-- include/linux/hugetlb.h | 27 ++- include/linux/shmem_fs.h | 9 +- include/linux/userfaultfd_k.h | 69 +++++--- 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 + 10 files changed, 196 insertions(+), 169 deletions(-)
-- 2.40.0.rc1.284.g88254d51c5-goog