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Message-ID: <20251130233553.1621716-1-ojeda@kernel.org>
Date: Mon, 1 Dec 2025 00:35:53 +0100
From: Miguel Ojeda <ojeda@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Miguel Ojeda <ojeda@...nel.org>,
Alex Gaynor <alex.gaynor@...il.com>,
Boqun Feng <boqun.feng@...il.com>,
Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Benno Lossin <lossin@...nel.org>,
Andreas Hindborg <a.hindborg@...nel.org>,
Alice Ryhl <aliceryhl@...gle.com>,
Trevor Gross <tmgross@...ch.edu>,
Danilo Krummrich <dakr@...nel.org>,
rust-for-linux@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [GIT PULL] Rust for 6.19
Hi Linus,
This is the next round of the Rust support.
The biggest one so far in terms of lines, but conceptually not so much.
The reason is that this is the PR that adds `syn` support -- I used a
merge commit for that patch series to keep the cover letter context.
No conflicts expected at this time. Nevertheless, I did a test merge.
When you merge other trees, you will have some. The resolutions in
linux-next should be fine.
All commits have been in linux-next for at least four rounds; most for
more than a week. The only C side change is the Rust-related kallsyms
one, which I had for an extra week in -next (in another branch).
Please pull for v6.19 -- thanks!
Cheers,
Miguel
The following changes since commit 211ddde0823f1442e4ad052a2f30f050145ccada:
Linux 6.18-rc2 (2025-10-19 15:19:16 -1000)
are available in the Git repository at:
https://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux.git tags/rust-6.19
for you to fetch changes up to 54e3eae855629702c566bd2e130d9f40e7f35bde:
Merge patch series "`syn` support" (2025-11-24 17:48:16 +0100)
----------------------------------------------------------------
Rust changes for v6.19
Toolchain and infrastructure:
- Add support for 'syn'.
Syn is a parsing library for parsing a stream of Rust tokens into a
syntax tree of Rust source code.
Currently this library is geared toward use in Rust procedural
macros, but contains some APIs that may be useful more generally.
'syn' allows us to greatly simplify writing complex macros such as
'pin-init' (Benno has already prepared the 'syn'-based version). We
will use it in the 'macros' crate too.
'syn' is the most downloaded Rust crate (according to crates.io), and
it is also used by the Rust compiler itself. While the amount of code
is substantial, there should not be many updates needed for these
crates, and even if there are, they should not be too big, e.g. +7k
-3k lines across the 3 crates in the last year.
'syn' requires two smaller dependencies: 'quote' and 'proc-macro2'.
I only modified their code to remove a third dependency
('unicode-ident') and to add the SPDX identifiers. The code can be
easily verified to exactly match upstream with the provided scripts.
They are all licensed under "Apache-2.0 OR MIT", like the other
vendored 'alloc' crate we had for a while.
Please see the merge commit with the cover letter for more context.
- Allow 'unreachable_pub' and 'clippy::disallowed_names' for doctests.
Examples (i.e. doctests) may want to do things like show public items
and use names such as 'foo'.
Nevertheless, we still try to keep examples as close to real code as
possible (this is part of why running Clippy on doctests is important
for us, e.g. for safety comments, which userspace Rust does not
support yet but we are stricter).
'kernel' crate:
- Replace our custom 'CStr' type with 'core::ffi::CStr'.
Using the standard library type reduces our custom code footprint,
and we retain needed custom functionality through an extension trait
and a new 'fmt!' macro which replaces the previous 'core' import.
This started in 6.17 and continued in 6.18, and we finally land the
replacement now. This required quite some stamina from Tamir, who
split the changes in steps to prepare for the flag day change here.
- Replace 'kernel::c_str!' with C string literals.
C string literals were added in Rust 1.77, which produce '&CStr's
(the 'core' one), so now we can write:
c"hi"
instead of:
c_str!("hi")
- Add 'num' module for numerical features.
It includes the 'Integer' trait, implemented for all primitive
integer types.
It also includes the 'Bounded' integer wrapping type: an integer
value that requires only the 'N' less significant bits of the wrapped
type to be encoded:
// An unsigned 8-bit integer, of which only the 4 LSBs are used.
let v = Bounded::<u8, 4>::new::<15>();
assert_eq!(v.get(), 15);
'Bounded' is useful to e.g. enforce guarantees when working with
bitfields that have an arbitrary number of bits.
Values can be constructed from simple non-constant expressions or,
for more complex ones, validated at runtime.
'Bounded' also comes with comparison and arithmetic operations (with
both their backing type and other 'Bounded's with a compatible
backing type), casts to change the backing type, extending/shrinking
and infallible/fallible conversions from/to primitives as applicable.
- 'rbtree' module: add immutable cursor ('Cursor').
It enables to use just an immutable tree reference where appropriate.
The existing fully-featured mutable cursor is renamed to 'CursorMut'.
kallsyms:
- Fix wrong "big" kernel symbol type read from procfs.
'pin-init' crate:
- A couple minor fixes (Benno asked me to pick these patches up for
him this cycle).
Documentation:
- Quick Start guide: add Debian 13 (Trixie).
Debian Stable is now able to build Linux, since Debian 13 (released
2025-08-09) packages Rust 1.85.0, which is recent enough.
We are planning to propose that the minimum supported Rust version in
Linux follows Debian Stable releases, with Debian 13 being the first
one we upgrade to, i.e. Rust 1.85.
MAINTAINERS:
- Add entry for the new 'num' module.
- Remove Alex as Rust maintainer: he hasn't had the time to contribute
for a few years now, so it is a no-op change in practice.
And a few other cleanups and improvements.
----------------------------------------------------------------
Alex Gaynor (1):
MAINTAINERS: Remove Alex Gaynor as Rust maintainer
Alexandre Courbot (5):
rust: add num module and Integer trait
rust: num: add Bounded integer wrapping type
MAINTAINERS: add entry for the Rust `num` module
rust: num: bounded: Always inline fits_within and from_expr
rust: num: bounded: rename `try_into_bitint` to `try_into_bounded`
Benno Lossin (1):
rust: pin-init: fix broken rust doc link
Brian Harring (1):
rust: pin-init: fix typo in docs
Miguel Ojeda (25):
samples: rust: debugfs: use `core::ffi::CStr` method names
docs: rust: quick-start: add Debian 13 (Trixie)
rust: allow `unreachable_pub` for doctests
rust: allow `clippy::disallowed_names` for doctests
rust: kbuild: introduce `core-flags` and `core-skip_flags`
rust: kbuild: simplify `--cfg` handling
rust: kbuild: add proc macro library support
rust: kbuild: support skipping flags in `rustc_test_library`
rust: kbuild: support using libraries in `rustc_procmacro`
rust: proc-macro2: import crate
rust: proc-macro2: add SPDX License Identifiers
rust: proc-macro2: remove `unicode_ident` dependency
rust: proc-macro2: add `README.md`
rust: proc-macro2: enable support in kbuild
rust: quote: import crate
rust: quote: add SPDX License Identifiers
rust: quote: add `README.md`
rust: quote: enable support in kbuild
rust: syn: import crate
rust: syn: add SPDX License Identifiers
rust: syn: remove `unicode-ident` dependency
rust: syn: add `README.md`
rust: syn: enable support in kbuild
rust: macros: support `proc-macro2`, `quote` and `syn`
Merge patch series "`syn` support"
Tamir Duberstein (19):
samples: rust: platform: remove trailing commas
rust_binder: remove trailing comma
rust_binder: use `kernel::fmt`
rust_binder: use `core::ffi::CStr` method names
rnull: use `kernel::fmt`
rust: alloc: use `kernel::fmt`
rust: debugfs: use `kernel::fmt`
rust: pci: use `kernel::fmt`
rust: remove spurious `use core::fmt::Debug`
rust: opp: use `CStr::as_char_ptr`
rust: configfs: use `CStr::as_char_ptr`
rust: regulator: use `CStr::as_char_ptr`
rust: clk: use `CStr::as_char_ptr`
rust: support formatting of foreign types
rust: replace `CStr` with `core::ffi::CStr`
rust: firmware: replace `kernel::c_str!` with C-Strings
rust: str: replace `kernel::c_str!` with C-Strings
rust: macros: replace `kernel::c_str!` with C-Strings
rust: sync: replace `kernel::c_str!` with C-Strings
Vitaly Wool (1):
rust: rbtree: add immutable cursor
Zheng Yejian (1):
kallsyms: Fix wrong "big" kernel symbol type read from procfs
.gitignore | 1 +
Documentation/rust/quick-start.rst | 4 +-
MAINTAINERS | 9 +-
Makefile | 7 +
drivers/android/binder/error.rs | 5 +-
drivers/android/binder/freeze.rs | 4 +-
drivers/android/binder/process.rs | 4 +-
drivers/android/binder/range_alloc/tree.rs | 2 +-
drivers/android/binder/stats.rs | 6 +-
drivers/block/rnull/configfs.rs | 9 +-
kernel/kallsyms.c | 5 +-
rust/Makefile | 147 +-
rust/ffi.rs | 2 +
rust/kernel/alloc/kvec/errors.rs | 14 +-
rust/kernel/clk.rs | 4 +-
rust/kernel/configfs.rs | 2 +-
rust/kernel/debugfs.rs | 2 +-
rust/kernel/debugfs/callback_adapters.rs | 7 +-
rust/kernel/debugfs/entry.rs | 2 +-
rust/kernel/debugfs/file_ops.rs | 6 +-
rust/kernel/debugfs/traits.rs | 10 +-
rust/kernel/device.rs | 1 +
rust/kernel/drm/ioctl.rs | 4 +-
rust/kernel/error.rs | 2 +
rust/kernel/firmware.rs | 15 +-
rust/kernel/fmt.rs | 87 +-
rust/kernel/init.rs | 3 +-
rust/kernel/lib.rs | 1 +
rust/kernel/num.rs | 79 +
rust/kernel/num/bounded.rs | 1058 +++++
rust/kernel/opp.rs | 6 +-
rust/kernel/pci/id.rs | 3 +-
rust/kernel/prelude.rs | 7 +-
rust/kernel/ptr.rs | 1 -
rust/kernel/rbtree.rs | 244 +-
rust/kernel/regulator.rs | 13 +-
rust/kernel/seq_file.rs | 2 +-
rust/kernel/str.rs | 454 +--
rust/kernel/sync.rs | 3 +-
rust/kernel/sync/condvar.rs | 2 +-
rust/kernel/sync/lock.rs | 2 +-
rust/kernel/sync/lock/global.rs | 2 +-
rust/kernel/types.rs | 1 -
rust/macros/fmt.rs | 94 +
rust/macros/lib.rs | 19 +
rust/macros/module.rs | 2 +-
rust/macros/quote.rs | 7 +
rust/pin-init/README.md | 2 +-
rust/pin-init/src/macros.rs | 2 +
rust/proc-macro2/README.md | 13 +
rust/proc-macro2/detection.rs | 77 +
rust/proc-macro2/extra.rs | 153 +
rust/proc-macro2/fallback.rs | 1258 ++++++
rust/proc-macro2/lib.rs | 1351 +++++++
rust/proc-macro2/location.rs | 31 +
rust/proc-macro2/marker.rs | 19 +
rust/proc-macro2/parse.rs | 997 +++++
rust/proc-macro2/probe.rs | 12 +
rust/proc-macro2/probe/proc_macro_span.rs | 53 +
rust/proc-macro2/probe/proc_macro_span_file.rs | 16 +
rust/proc-macro2/probe/proc_macro_span_location.rs | 23 +
rust/proc-macro2/rcvec.rs | 148 +
rust/proc-macro2/wrapper.rs | 986 +++++
rust/quote/README.md | 12 +
rust/quote/ext.rs | 112 +
rust/quote/format.rs | 170 +
rust/quote/ident_fragment.rs | 90 +
rust/quote/lib.rs | 1456 +++++++
rust/quote/runtime.rs | 494 +++
rust/quote/spanned.rs | 52 +
rust/quote/to_tokens.rs | 273 ++
rust/syn/README.md | 13 +
rust/syn/attr.rs | 838 ++++
rust/syn/bigint.rs | 68 +
rust/syn/buffer.rs | 436 ++
rust/syn/classify.rs | 313 ++
rust/syn/custom_keyword.rs | 262 ++
rust/syn/custom_punctuation.rs | 306 ++
rust/syn/data.rs | 426 ++
rust/syn/derive.rs | 261 ++
rust/syn/discouraged.rs | 227 ++
rust/syn/drops.rs | 60 +
rust/syn/error.rs | 469 +++
rust/syn/export.rs | 75 +
rust/syn/expr.rs | 4175 ++++++++++++++++++++
rust/syn/ext.rs | 138 +
rust/syn/file.rs | 127 +
rust/syn/fixup.rs | 775 ++++
rust/syn/gen/clone.rs | 2269 +++++++++++
rust/syn/gen/debug.rs | 3240 +++++++++++++++
rust/syn/gen/eq.rs | 2308 +++++++++++
rust/syn/gen/fold.rs | 3904 ++++++++++++++++++
rust/syn/gen/hash.rs | 2878 ++++++++++++++
rust/syn/gen/visit.rs | 3943 ++++++++++++++++++
rust/syn/gen/visit_mut.rs | 3761 ++++++++++++++++++
rust/syn/generics.rs | 1479 +++++++
rust/syn/group.rs | 293 ++
rust/syn/ident.rs | 110 +
rust/syn/item.rs | 3492 ++++++++++++++++
rust/syn/lib.rs | 1013 +++++
rust/syn/lifetime.rs | 158 +
rust/syn/lit.rs | 1862 +++++++++
rust/syn/lookahead.rs | 334 ++
rust/syn/mac.rs | 227 ++
rust/syn/macros.rs | 184 +
rust/syn/meta.rs | 429 ++
rust/syn/op.rs | 221 ++
rust/syn/parse.rs | 1421 +++++++
rust/syn/parse_macro_input.rs | 130 +
rust/syn/parse_quote.rs | 242 ++
rust/syn/pat.rs | 957 +++++
rust/syn/path.rs | 968 +++++
rust/syn/precedence.rs | 212 +
rust/syn/print.rs | 18 +
rust/syn/punctuated.rs | 1157 ++++++
rust/syn/restriction.rs | 180 +
rust/syn/scan_expr.rs | 267 ++
rust/syn/sealed.rs | 6 +
rust/syn/span.rs | 65 +
rust/syn/spanned.rs | 120 +
rust/syn/stmt.rs | 486 +++
rust/syn/thread.rs | 62 +
rust/syn/token.rs | 1098 +++++
rust/syn/tt.rs | 109 +
rust/syn/ty.rs | 1273 ++++++
rust/syn/verbatim.rs | 35 +
rust/syn/whitespace.rs | 67 +
samples/rust/rust_debugfs_scoped.rs | 2 +-
samples/rust/rust_driver_platform.rs | 4 +-
scripts/generate_rust_analyzer.py | 25 +-
scripts/rustdoc_test_gen.rs | 1 +
131 files changed, 59666 insertions(+), 477 deletions(-)
create mode 100644 rust/kernel/num.rs
create mode 100644 rust/kernel/num/bounded.rs
create mode 100644 rust/macros/fmt.rs
create mode 100644 rust/proc-macro2/README.md
create mode 100644 rust/proc-macro2/detection.rs
create mode 100644 rust/proc-macro2/extra.rs
create mode 100644 rust/proc-macro2/fallback.rs
create mode 100644 rust/proc-macro2/lib.rs
create mode 100644 rust/proc-macro2/location.rs
create mode 100644 rust/proc-macro2/marker.rs
create mode 100644 rust/proc-macro2/parse.rs
create mode 100644 rust/proc-macro2/probe.rs
create mode 100644 rust/proc-macro2/probe/proc_macro_span.rs
create mode 100644 rust/proc-macro2/probe/proc_macro_span_file.rs
create mode 100644 rust/proc-macro2/probe/proc_macro_span_location.rs
create mode 100644 rust/proc-macro2/rcvec.rs
create mode 100644 rust/proc-macro2/wrapper.rs
create mode 100644 rust/quote/README.md
create mode 100644 rust/quote/ext.rs
create mode 100644 rust/quote/format.rs
create mode 100644 rust/quote/ident_fragment.rs
create mode 100644 rust/quote/lib.rs
create mode 100644 rust/quote/runtime.rs
create mode 100644 rust/quote/spanned.rs
create mode 100644 rust/quote/to_tokens.rs
create mode 100644 rust/syn/README.md
create mode 100644 rust/syn/attr.rs
create mode 100644 rust/syn/bigint.rs
create mode 100644 rust/syn/buffer.rs
create mode 100644 rust/syn/classify.rs
create mode 100644 rust/syn/custom_keyword.rs
create mode 100644 rust/syn/custom_punctuation.rs
create mode 100644 rust/syn/data.rs
create mode 100644 rust/syn/derive.rs
create mode 100644 rust/syn/discouraged.rs
create mode 100644 rust/syn/drops.rs
create mode 100644 rust/syn/error.rs
create mode 100644 rust/syn/export.rs
create mode 100644 rust/syn/expr.rs
create mode 100644 rust/syn/ext.rs
create mode 100644 rust/syn/file.rs
create mode 100644 rust/syn/fixup.rs
create mode 100644 rust/syn/gen/clone.rs
create mode 100644 rust/syn/gen/debug.rs
create mode 100644 rust/syn/gen/eq.rs
create mode 100644 rust/syn/gen/fold.rs
create mode 100644 rust/syn/gen/hash.rs
create mode 100644 rust/syn/gen/visit.rs
create mode 100644 rust/syn/gen/visit_mut.rs
create mode 100644 rust/syn/generics.rs
create mode 100644 rust/syn/group.rs
create mode 100644 rust/syn/ident.rs
create mode 100644 rust/syn/item.rs
create mode 100644 rust/syn/lib.rs
create mode 100644 rust/syn/lifetime.rs
create mode 100644 rust/syn/lit.rs
create mode 100644 rust/syn/lookahead.rs
create mode 100644 rust/syn/mac.rs
create mode 100644 rust/syn/macros.rs
create mode 100644 rust/syn/meta.rs
create mode 100644 rust/syn/op.rs
create mode 100644 rust/syn/parse.rs
create mode 100644 rust/syn/parse_macro_input.rs
create mode 100644 rust/syn/parse_quote.rs
create mode 100644 rust/syn/pat.rs
create mode 100644 rust/syn/path.rs
create mode 100644 rust/syn/precedence.rs
create mode 100644 rust/syn/print.rs
create mode 100644 rust/syn/punctuated.rs
create mode 100644 rust/syn/restriction.rs
create mode 100644 rust/syn/scan_expr.rs
create mode 100644 rust/syn/sealed.rs
create mode 100644 rust/syn/span.rs
create mode 100644 rust/syn/spanned.rs
create mode 100644 rust/syn/stmt.rs
create mode 100644 rust/syn/thread.rs
create mode 100644 rust/syn/token.rs
create mode 100644 rust/syn/tt.rs
create mode 100644 rust/syn/ty.rs
create mode 100644 rust/syn/verbatim.rs
create mode 100644 rust/syn/whitespace.rs
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