[PATCH v2 00/33] rust: bump minimum Rust and `bindgen` versions

Miguel Ojeda
2026-04-05T23:53:28Z

As proposed in the past in e.g. LPC 2025 and the Maintainers Summit [1],
we are going to follow Debian Stable's Rust versions as our minimum
supported version.

Debian Trixie was released with a Rust 1.85.0 toolchain [2], which it
still uses to this day [3] (i.e. no update to Rust 1.85.1).

Debian Trixie was released with `bindgen` 0.71.1, which it also still
uses to this day [4].

Debian Trixie's release happened on 2025-08-09 [5], which means that a
fair amount of time has passed since its release for kernel developers
to upgrade.

Thus bump the minimum to the new versions, i.e.

- Rust: 1.78.0 -> 1.85.0
- bindgen: 0.65.1 -> 0.71.1

There are a few main parts to the series, in this order:

- A few cleanups that can be performed before the bumps.
- The Rust bump (and its cleanups).
- The `bindgen` bump (and its cleanups).
- Documentation updates.
- The `cfi_encoding` patch, added here, which needs the bump.
- The per-version flags support and a Clippy cleanup on top.

Link: https://lwn.net/Articles/1050174/ [1]
Link: https://www.debian.org/releases/trixie/release-notes/whats-new.en.html#desktops-and-well-known-packages [2]
Link: https://packages.debian.org/trixie/rustc [3]
Link: https://packages.debian.org/trixie/bindgen [4]
Link: https://www.debian.org/releases/trixie/ [5]
---
v1: https://lore.kernel.org/rust-for-linux/20260401114540.30108-1-ojeda@kernel.org/
v2:
- Added patch to globally allow `incompatible_msrv` and removed the
last instance.

- Replaced `--remap-path-prefix` patches with one that drops the
workaround entirely (and place it as the first one) and summarizes
the discussion.

I also noticed that `--remap-path-prefix` for `rustdoc` is still
unstable (unlike `rustc`'s one), so I added it to our list as usual
(https://github.com/Rust-for-Linux/linux/issues/2). There does not
seem to be a tracking issue, so I asked upstream about it.

We will need these two lines as the resolution for the conflict:

$(RUSTDOC) $(filter-out $(skip_flags) --remap-path-scope=%,$(if $(rustdoc_host),$(rust_common_flags),$(rust_flags))) \

$(RUSTDOC) --test $(filter-out --remap-path-scope=%,$(rust_flags)) \

- Reworked the `extract_if` patch to use it (unstably). The feature
last major change happened in Rust 1.85.0, so that is fine.

- Moved `$(HOSTRUSTFLAGS)` below so that per-version flags (like
lints) can be overridden too. Please see the details in the commit
and my reply to v1.

- Added `feature(extract_if)` and `feature(non_null_convenience)`
items to https://github.com/Rust-for-Linux/linux/issues/1223.

Then reworded the commits accordingly to include the references
to tracking issues and PRs.

- Other rewords, e.g. the "beyond" typo.

- Rebased on top of `rust-next`.

- Picked up tags.

Alice Ryhl (1):
rust: declare cfi_encoding for lru_status

Miguel Ojeda (32):
rust: kbuild: remove `--remap-path-prefix` workarounds
rust: kbuild: remove "`try` keyword" workaround for `bindgen` < 0.59.2
rust: kbuild: remove unneeded old `allow`s for generated layout tests
gpu: nova-core: bindings: remove unneeded `cfg_attr`
rust: bump Rust minimum supported version to 1.85.0 (Debian Trixie)
rust: bump Clippy's MSRV and clean `incompatible_msrv` allows
rust: allow globally `clippy::incompatible_msrv`
rust: simplify `RUSTC_VERSION` Kconfig conditions
rust: remove `RUSTC_HAS_SLICE_AS_FLATTENED` and simplify code
rust: remove `RUSTC_HAS_COERCE_POINTEE` and simplify code
rust: kbuild: remove skipping of `-Wrustdoc::unescaped_backticks`
rust: kbuild: remove `feature(...)`s that are now stable
rust: transmute: simplify code with Rust 1.80.0 `split_at_*checked()`
rust: alloc: simplify with `NonNull::add()` now that it is stable
rust: macros: simplify code using `feature(extract_if)`
rust: block: update `const_refs_to_static` MSRV TODO comment
rust: bump `bindgen` minimum supported version to 0.71.1 (Debian
Trixie)
rust: rust_is_available: remove warning for `bindgen` 0.66.[01]
rust: rust_is_available: remove warning for `bindgen` < 0.69.5 &&
libclang >= 19.1
rust: kbuild: update `bindgen --rust-target` version and replace
comment
rust: kbuild: remove "dummy parameter" workaround for `bindgen` <
0.71.1
docs: rust: quick-start: openSUSE provides `rust-src` package nowadays
docs: rust: quick-start: update Ubuntu versioned packages
docs: rust: quick-start: update minimum Ubuntu version
docs: rust: quick-start: add Ubuntu 26.04 LTS and remove subsection
title
docs: rust: quick-start: remove Gentoo "testing" note
docs: rust: quick-start: remove Nix "unstable channel" note
docs: rust: quick-start: remove GDB/Binutils mention
docs: rust: general-information: simplify Kconfig example
docs: rust: general-information: use real example
rust: kbuild: support global per-version flags
rust: kbuild: allow `clippy::precedence` for Rust < 1.86.0

.clippy.toml | 2 +-
Documentation/process/changes.rst | 4 +-
Documentation/rust/general-information.rst | 4 +-
Documentation/rust/quick-start.rst | 52 +++++++----------
Makefile | 12 +++-
arch/Kconfig | 3 +-
arch/arm64/Kconfig | 8 ---
arch/riscv/Kconfig | 3 -
drivers/android/binder/Makefile | 3 +-
drivers/android/binder/page_range.rs | 6 +-
drivers/android/binder/page_range_helper.c | 24 --------
drivers/android/binder/page_range_helper.h | 15 -----
drivers/gpu/nova-core/gsp/cmdq.rs | 6 +-
drivers/gpu/nova-core/gsp/fw/r570_144.rs | 3 -
init/Kconfig | 15 +----
rust/Makefile | 31 ++--------
rust/bindgen_parameters | 8 +--
rust/bindings/bindings_helper.h | 1 -
rust/bindings/lib.rs | 5 +-
rust/kernel/alloc/allocator/iter.rs | 8 +--
rust/kernel/alloc/kbox.rs | 29 +---------
rust/kernel/block/mq/gen_disk.rs | 4 +-
rust/kernel/lib.rs | 30 +---------
rust/kernel/list/arc.rs | 22 +------
rust/kernel/prelude.rs | 3 -
rust/kernel/ptr.rs | 1 -
rust/kernel/slice.rs | 49 ----------------
rust/kernel/sync/arc.rs | 21 +------
rust/kernel/transmute.rs | 35 ++---------
rust/macros/helpers.rs | 1 -
rust/macros/kunit.rs | 9 +--
rust/macros/lib.rs | 3 +
rust/uapi/lib.rs | 5 +-
scripts/Makefile.build | 6 +-
scripts/min-tool-version.sh | 4 +-
scripts/rust_is_available.sh | 36 +-----------
scripts/rust_is_available_bindgen_0_66.h | 2 -
...ust_is_available_bindgen_libclang_concat.h | 3 -
scripts/rust_is_available_test.py | 58 +------------------
39 files changed, 83 insertions(+), 451 deletions(-)
delete mode 100644 drivers/android/binder/page_range_helper.c
delete mode 100644 drivers/android/binder/page_range_helper.h
delete mode 100644 rust/kernel/slice.rs
delete mode 100644 scripts/rust_is_available_bindgen_0_66.h
delete mode 100644 scripts/rust_is_available_bindgen_libclang_concat.h

base-commit: 36f5a2b09e650b82d7b2a106e3b93af48c2010d9
--
2.53.0