[PATCH v3 0/6] rust: reduce pointer casts, enable related lints

Tamir Duberstein
2025-03-14T12:28:17Z

This started with a patch that enabled `clippy::ptr_as_ptr`. Benno
Lossin suggested I also look into `clippy::ptr_cast_constness` and I
discovered `clippy::as_ptr_cast_mut`. This series now enables all 3
lints. It also enables `clippy::as_underscore` which ensures other
pointer casts weren't missed. The first commit reduces the need for
pointer casts and is shared with another series[1].

The final patch also enables pointer provenance lints and fixes
violations. See that commit message for details. The build system
portion of that commit is pretty messy but I couldn't find a better way
to convincingly ensure that these lints were applied globally.
Suggestions would be very welcome.

Link: https://lore.kernel.org/all/20250307-no-offset-v1-0-0c728f63b69c@gmail.com/ [1]

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
Changes in v3:
- Fixed clippy warning in rust/kernel/firmware.rs. (kernel test robot)
Link: https://lore.kernel.org/all/202503120332.YTCpFEvv-lkp@intel.com/
- s/as u64/as bindings::phys_addr_t/g. (Benno Lossin)
- Use strict provenance APIs and enable lints. (Benno Lossin)
- Link to v2: https://lore.kernel.org/r/20250309-ptr-as-ptr-v2-0-25d60ad922b7@gmail.com

Changes in v2:
- Fixed typo in first commit message.
- Added additional patches, converted to series.
- Link to v1: https://lore.kernel.org/r/20250307-ptr-as-ptr-v1-1-582d06514c98@gmail.com

---
Tamir Duberstein (6):
rust: retain pointer mut-ness in `container_of!`
rust: enable `clippy::ptr_as_ptr` lint
rust: enable `clippy::ptr_cast_constness` lint
rust: enable `clippy::as_ptr_cast_mut` lint
rust: enable `clippy::as_underscore` lint
rust: use strict provenance APIs

Makefile | 13 ++++++++++++-
init/Kconfig | 3 +++
rust/Makefile | 26 ++++++++++++++++++++------
rust/bindings/lib.rs | 1 +
rust/kernel/alloc.rs | 2 +-
rust/kernel/alloc/allocator_test.rs | 2 +-
rust/kernel/alloc/kvec.rs | 4 ++--
rust/kernel/block/mq/operations.rs | 2 +-
rust/kernel/block/mq/request.rs | 7 ++++---
rust/kernel/device.rs | 5 +++--
rust/kernel/device_id.rs | 2 +-
rust/kernel/devres.rs | 19 ++++++++++---------
rust/kernel/error.rs | 2 +-
rust/kernel/firmware.rs | 3 ++-
rust/kernel/fs/file.rs | 2 +-
rust/kernel/io.rs | 16 ++++++++--------
rust/kernel/kunit.rs | 15 +++++++--------
rust/kernel/lib.rs | 25 ++++++++++++++++++++++---
rust/kernel/list/impl_list_item_mod.rs | 2 +-
rust/kernel/miscdevice.rs | 2 +-
rust/kernel/of.rs | 6 +++---
rust/kernel/pci.rs | 15 +++++++++------
rust/kernel/platform.rs | 6 ++++--
rust/kernel/print.rs | 11 +++++------
rust/kernel/rbtree.rs | 23 ++++++++++-------------
rust/kernel/seq_file.rs | 3 ++-
rust/kernel/str.rs | 18 +++++++-----------
rust/kernel/sync/poll.rs | 2 +-
rust/kernel/uaccess.rs | 12 ++++++++----
rust/kernel/workqueue.rs | 12 ++++++------
rust/uapi/lib.rs | 1 +
scripts/Makefile.build | 2 +-
scripts/Makefile.host | 4 ++++
33 files changed, 163 insertions(+), 105 deletions(-)
---
base-commit: a1eb95d6b5f4cf5cc7b081e85e374d1dd98a213b
change-id: 20250307-ptr-as-ptr-21b1867fc4d4

Best regards,
--
Tamir Duberstein <tamird@gmail.com>