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From: Miguel Ojeda <ojeda@kernel.org>
To: Miguel Ojeda <ojeda@kernel.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Nicolas Schier <nsc@kernel.org>
Cc: Boqun Feng <boqun@kernel.org>,
	Gary Guo <gary@garyguo.net>,
	=?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= <bjorn3_gh@protonmail.com>,
	Benno Lossin <lossin@kernel.org>,
	Andreas Hindborg <a.hindborg@kernel.org>,
	Alice Ryhl <aliceryhl@google.com>,
	Trevor Gross <tmgross@umich.edu>,
	Danilo Krummrich <dakr@kernel.org>,
	rust-for-linux@vger.kernel.org,
	linux-kbuild@vger.kernel.org,
	Joshua Liebow-Feeser <joshlf@google.com>,
	Jack Wrenn <jswrenn@amazon.com>
Subject: [PATCH 00/18] `zerocopy` support
Date: Tue,  2 Jun 2026 19:29:01 +0200
Message-ID: <20260602172920.30342-1-ojeda@kernel.org>
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This patch series introduces support for `zerocopy`:

    Fast, safe, compile error. Pick two.

    Zerocopy makes zero-cost memory manipulation effortless. We write
    `unsafe` so you don't have to.

It essentially provides derivable traits (e.g. `FromBytes`) and macros
(e.g. `transmute!`) for safely converting between byte sequences and
other types. Having such support allows us to remove some `unsafe` code.

It is among the most downloaded Rust crates (top #50 recent, top #100
all-time downloads; according to crates.io), and it is also used by the
Rust compiler itself.

The series starts with a few preparation commits, then the `zerocopy`
and `zerocopy-derive` crates are added. Finally, an example patch using
it is on top, removing one `unsafe impl`.

I had to adapt the crates slightly (just +2/-3 lines), but both patches
could potentially be provided upstream eventually. Please see the
commits for details.

In total, it is about ~39k lines added, ~32k without counting `benches/`
which are just for documentation purposes.

See the cover letter for `syn` for some more details about depending on
third-party crates in commit 54e3eae85562 ("Merge patch series "`syn`
support"").

The codegen of an isolated example function similar to the patch on top
is essentially identical. It also turns out that (for that particular
case) `zerocopy`'s version, even under `debug-assertions` enabled, has
no remaining panics, unlike a few in the current code (because the
compiler can prove the remaining `ub_checks` statically).

So their "fast, safe" does indeed check out -- at least in that case.

P.S. This version of `zerocopy` has already the unstable `Ptr{,Inner}`
types -- to play with them, please use:

    make ... KRUSTFLAGS=--cfg=zerocopy_unstable_ptr

Miguel Ojeda (18):
  scripts: generate_rust_analyzer: support passing env vars
  rust: kbuild: show the right `quiet_cmd_rustc_procmacrolibrary`
  rust: kbuild: remove unused variable
  rust: kbuild: define `procmacro-name` function
  rust: kbuild: define `procmacro-extension` variable
  rust: kbuild: support per-target environment variables
  rust: kbuild: support `skip_clippy` for `rustc_procmacro`
  rust: zerocopy: import crate
  rust: zerocopy: add SPDX License Identifiers
  rust: zerocopy: remove float `Display` support
  rust: zerocopy: add `README.md`
  rust: zerocopy: enable support in kbuild
  rust: zerocopy-derive: import crate
  rust: zerocopy-derive: add SPDX License Identifiers
  rust: zerocopy-derive: avoid generating non-ASCII identifiers
  rust: zerocopy-derive: add `README.md`
  rust: zerocopy-derive: enable support in kbuild
  gpu: nova-core: firmware: parse `FalconUCodeDescV2` via `zerocopy`

 Makefile                                      |    2 +
 drivers/gpu/nova-core/firmware.rs             |    5 +-
 drivers/gpu/nova-core/vbios.rs                |    4 +-
 rust/Makefile                                 |   91 +-
 rust/zerocopy-derive/README.md                |   14 +
 rust/zerocopy-derive/derive/from_bytes.rs     |  192 +
 rust/zerocopy-derive/derive/into_bytes.rs     |  164 +
 rust/zerocopy-derive/derive/known_layout.rs   |  350 +
 rust/zerocopy-derive/derive/mod.rs            |  132 +
 rust/zerocopy-derive/derive/try_from_bytes.rs |  765 ++
 rust/zerocopy-derive/derive/unaligned.rs      |   80 +
 rust/zerocopy-derive/lib.rs                   |  146 +
 rust/zerocopy-derive/repr.rs                  |  851 ++
 rust/zerocopy-derive/util.rs                  |  845 ++
 rust/zerocopy/README.md                       |   14 +
 .../zerocopy/benches/as_bytes_dynamic_size.rs |    9 +
 .../benches/as_bytes_dynamic_size.x86-64      |    5 +
 .../benches/as_bytes_dynamic_size.x86-64.mca  |   47 +
 rust/zerocopy/benches/as_bytes_static_size.rs |    9 +
 .../benches/as_bytes_static_size.x86-64       |    4 +
 .../benches/as_bytes_static_size.x86-64.mca   |   45 +
 rust/zerocopy/benches/extend_vec_zeroed.rs    |    9 +
 .../zerocopy/benches/extend_vec_zeroed.x86-64 |   60 +
 .../benches/extend_vec_zeroed.x86-64.mca      |  147 +
 .../benches/formats/coco_dynamic_padding.rs   |   24 +
 .../benches/formats/coco_dynamic_size.rs      |   27 +
 .../benches/formats/coco_static_size.rs       |   27 +
 rust/zerocopy/benches/insert_vec_zeroed.rs    |   13 +
 .../zerocopy/benches/insert_vec_zeroed.x86-64 |   79 +
 .../benches/insert_vec_zeroed.x86-64.mca      |  183 +
 rust/zerocopy/benches/new_box_zeroed.rs       |    9 +
 rust/zerocopy/benches/new_box_zeroed.x86-64   |    7 +
 .../benches/new_box_zeroed.x86-64.mca         |   51 +
 ...w_box_zeroed_with_elems_dynamic_padding.rs |   11 +
 ...x_zeroed_with_elems_dynamic_padding.x86-64 |   24 +
 ...roed_with_elems_dynamic_padding.x86-64.mca |   81 +
 .../new_box_zeroed_with_elems_dynamic_size.rs |    9 +
 ..._box_zeroed_with_elems_dynamic_size.x86-64 |   22 +
 ..._zeroed_with_elems_dynamic_size.x86-64.mca |   77 +
 rust/zerocopy/benches/new_vec_zeroed.rs       |    9 +
 rust/zerocopy/benches/new_vec_zeroed.x86-64   |   40 +
 .../benches/new_vec_zeroed.x86-64.mca         |  113 +
 rust/zerocopy/benches/new_zeroed.rs           |    9 +
 rust/zerocopy/benches/new_zeroed.x86-64       |    3 +
 rust/zerocopy/benches/new_zeroed.x86-64.mca   |   43 +
 rust/zerocopy/benches/read_from_bytes.rs      |    7 +
 rust/zerocopy/benches/read_from_bytes.x86-64  |   15 +
 .../benches/read_from_bytes.x86-64.mca        |   65 +
 rust/zerocopy/benches/read_from_prefix.rs     |   10 +
 rust/zerocopy/benches/read_from_prefix.x86-64 |   14 +
 .../benches/read_from_prefix.x86-64.mca       |   63 +
 rust/zerocopy/benches/read_from_suffix.rs     |   10 +
 rust/zerocopy/benches/read_from_suffix.x86-64 |   15 +
 .../benches/read_from_suffix.x86-64.mca       |   65 +
 .../benches/ref_from_bytes_dynamic_padding.rs |    7 +
 .../ref_from_bytes_dynamic_padding.x86-64     |   22 +
 .../ref_from_bytes_dynamic_padding.x86-64.mca |   77 +
 .../benches/ref_from_bytes_dynamic_size.rs    |    7 +
 .../ref_from_bytes_dynamic_size.x86-64        |   20 +
 .../ref_from_bytes_dynamic_size.x86-64.mca    |   75 +
 .../benches/ref_from_bytes_static_size.rs     |    7 +
 .../benches/ref_from_bytes_static_size.x86-64 |    8 +
 .../ref_from_bytes_static_size.x86-64.mca     |   53 +
 ...f_from_bytes_with_elems_dynamic_padding.rs |   10 +
 ...om_bytes_with_elems_dynamic_padding.x86-64 |   19 +
 ...ytes_with_elems_dynamic_padding.x86-64.mca |   71 +
 .../ref_from_bytes_with_elems_dynamic_size.rs |   10 +
 ..._from_bytes_with_elems_dynamic_size.x86-64 |   16 +
 ...m_bytes_with_elems_dynamic_size.x86-64.mca |   65 +
 .../ref_from_prefix_dynamic_padding.rs        |   10 +
 .../ref_from_prefix_dynamic_padding.x86-64    |   22 +
 ...ref_from_prefix_dynamic_padding.x86-64.mca |   77 +
 .../benches/ref_from_prefix_dynamic_size.rs   |   10 +
 .../ref_from_prefix_dynamic_size.x86-64       |   17 +
 .../ref_from_prefix_dynamic_size.x86-64.mca   |   67 +
 .../benches/ref_from_prefix_static_size.rs    |   10 +
 .../ref_from_prefix_static_size.x86-64        |    8 +
 .../ref_from_prefix_static_size.x86-64.mca    |   53 +
 ..._from_prefix_with_elems_dynamic_padding.rs |   13 +
 ...m_prefix_with_elems_dynamic_padding.x86-64 |   26 +
 ...efix_with_elems_dynamic_padding.x86-64.mca |   85 +
 ...ref_from_prefix_with_elems_dynamic_size.rs |   13 +
 ...from_prefix_with_elems_dynamic_size.x86-64 |   22 +
 ..._prefix_with_elems_dynamic_size.x86-64.mca |   77 +
 .../ref_from_suffix_dynamic_padding.rs        |   10 +
 .../ref_from_suffix_dynamic_padding.x86-64    |   23 +
 ...ref_from_suffix_dynamic_padding.x86-64.mca |   79 +
 .../benches/ref_from_suffix_dynamic_size.rs   |   10 +
 .../ref_from_suffix_dynamic_size.x86-64       |   13 +
 .../ref_from_suffix_dynamic_size.x86-64.mca   |   63 +
 .../benches/ref_from_suffix_static_size.rs    |   10 +
 .../ref_from_suffix_static_size.x86-64        |   13 +
 .../ref_from_suffix_static_size.x86-64.mca    |   61 +
 ..._from_suffix_with_elems_dynamic_padding.rs |   13 +
 ...m_suffix_with_elems_dynamic_padding.x86-64 |   27 +
 ...ffix_with_elems_dynamic_padding.x86-64.mca |   85 +
 ...ref_from_suffix_with_elems_dynamic_size.rs |   13 +
 ...from_suffix_with_elems_dynamic_size.x86-64 |   23 +
 ..._suffix_with_elems_dynamic_size.x86-64.mca |   77 +
 .../benches/split_at_dynamic_padding.rs       |   12 +
 .../benches/split_at_dynamic_padding.x86-64   |   12 +
 .../split_at_dynamic_padding.x86-64.mca       |   59 +
 .../zerocopy/benches/split_at_dynamic_size.rs |   12 +
 .../benches/split_at_dynamic_size.x86-64      |   12 +
 .../benches/split_at_dynamic_size.x86-64.mca  |   59 +
 .../split_at_unchecked_dynamic_padding.rs     |   12 +
 .../split_at_unchecked_dynamic_padding.x86-64 |    6 +
 ...it_at_unchecked_dynamic_padding.x86-64.mca |   49 +
 .../split_at_unchecked_dynamic_size.rs        |   12 +
 .../split_at_unchecked_dynamic_size.x86-64    |    6 +
 ...split_at_unchecked_dynamic_size.x86-64.mca |   49 +
 .../split_via_immutable_dynamic_padding.rs    |   11 +
 ...split_via_immutable_dynamic_padding.x86-64 |   14 +
 ...t_via_immutable_dynamic_padding.x86-64.mca |   65 +
 .../split_via_immutable_dynamic_size.rs       |   11 +
 .../split_via_immutable_dynamic_size.x86-64   |   13 +
 ...plit_via_immutable_dynamic_size.x86-64.mca |   63 +
 ...split_via_runtime_check_dynamic_padding.rs |   11 +
 ...t_via_runtime_check_dynamic_padding.x86-64 |   22 +
 ...a_runtime_check_dynamic_padding.x86-64.mca |   79 +
 .../split_via_runtime_check_dynamic_size.rs   |   11 +
 ...plit_via_runtime_check_dynamic_size.x86-64 |   13 +
 ..._via_runtime_check_dynamic_size.x86-64.mca |   63 +
 .../split_via_unchecked_dynamic_padding.rs    |   11 +
 ...split_via_unchecked_dynamic_padding.x86-64 |   14 +
 ...t_via_unchecked_dynamic_padding.x86-64.mca |   65 +
 .../split_via_unchecked_dynamic_size.rs       |   11 +
 .../split_via_unchecked_dynamic_size.x86-64   |   13 +
 ...plit_via_unchecked_dynamic_size.x86-64.mca |   63 +
 rust/zerocopy/benches/transmute.rs            |   16 +
 rust/zerocopy/benches/transmute.x86-64        |    3 +
 rust/zerocopy/benches/transmute.x86-64.mca    |   43 +
 .../benches/transmute_ref_dynamic_size.rs     |   16 +
 .../benches/transmute_ref_dynamic_size.x86-64 |    4 +
 .../transmute_ref_dynamic_size.x86-64.mca     |   45 +
 .../benches/transmute_ref_static_size.rs      |   15 +
 .../benches/transmute_ref_static_size.x86-64  |    3 +
 .../transmute_ref_static_size.x86-64.mca      |   43 +
 rust/zerocopy/benches/try_read_from_bytes.rs  |    7 +
 .../benches/try_read_from_bytes.x86-64        |   23 +
 .../benches/try_read_from_bytes.x86-64.mca    |   79 +
 rust/zerocopy/benches/try_read_from_prefix.rs |   10 +
 .../benches/try_read_from_prefix.x86-64       |   16 +
 .../benches/try_read_from_prefix.x86-64.mca   |   67 +
 rust/zerocopy/benches/try_read_from_suffix.rs |   10 +
 .../benches/try_read_from_suffix.x86-64       |   18 +
 .../benches/try_read_from_suffix.x86-64.mca   |   71 +
 .../try_ref_from_bytes_dynamic_padding.rs     |    7 +
 .../try_ref_from_bytes_dynamic_padding.x86-64 |   24 +
 ..._ref_from_bytes_dynamic_padding.x86-64.mca |   81 +
 .../try_ref_from_bytes_dynamic_size.rs        |    7 +
 .../try_ref_from_bytes_dynamic_size.x86-64    |   22 +
 ...try_ref_from_bytes_dynamic_size.x86-64.mca |   79 +
 .../benches/try_ref_from_bytes_static_size.rs |    7 +
 .../try_ref_from_bytes_static_size.x86-64     |   13 +
 .../try_ref_from_bytes_static_size.x86-64.mca |   59 +
 ...f_from_bytes_with_elems_dynamic_padding.rs |   10 +
 ...om_bytes_with_elems_dynamic_padding.x86-64 |   21 +
 ...ytes_with_elems_dynamic_padding.x86-64.mca |   75 +
 ..._ref_from_bytes_with_elems_dynamic_size.rs |   10 +
 ..._from_bytes_with_elems_dynamic_size.x86-64 |   18 +
 ...m_bytes_with_elems_dynamic_size.x86-64.mca |   69 +
 .../try_ref_from_prefix_dynamic_padding.rs    |   10 +
 ...try_ref_from_prefix_dynamic_padding.x86-64 |   29 +
 ...ref_from_prefix_dynamic_padding.x86-64.mca |   91 +
 .../try_ref_from_prefix_dynamic_size.rs       |   10 +
 .../try_ref_from_prefix_dynamic_size.x86-64   |   22 +
 ...ry_ref_from_prefix_dynamic_size.x86-64.mca |   77 +
 .../try_ref_from_prefix_static_size.rs        |   10 +
 .../try_ref_from_prefix_static_size.x86-64    |   15 +
 ...try_ref_from_prefix_static_size.x86-64.mca |   63 +
 ..._from_prefix_with_elems_dynamic_padding.rs |   13 +
 ...m_prefix_with_elems_dynamic_padding.x86-64 |   30 +
 ...efix_with_elems_dynamic_padding.x86-64.mca |   91 +
 ...ref_from_prefix_with_elems_dynamic_size.rs |   13 +
 ...from_prefix_with_elems_dynamic_size.x86-64 |   26 +
 ..._prefix_with_elems_dynamic_size.x86-64.mca |   83 +
 .../try_ref_from_suffix_dynamic_padding.rs    |   10 +
 ...try_ref_from_suffix_dynamic_padding.x86-64 |   26 +
 ...ref_from_suffix_dynamic_padding.x86-64.mca |   85 +
 .../try_ref_from_suffix_dynamic_size.rs       |   10 +
 .../try_ref_from_suffix_dynamic_size.x86-64   |   18 +
 ...ry_ref_from_suffix_dynamic_size.x86-64.mca |   71 +
 .../try_ref_from_suffix_static_size.rs        |   10 +
 .../try_ref_from_suffix_static_size.x86-64    |   16 +
 ...try_ref_from_suffix_static_size.x86-64.mca |   67 +
 ..._from_suffix_with_elems_dynamic_padding.rs |   13 +
 ...m_suffix_with_elems_dynamic_padding.x86-64 |   32 +
 ...ffix_with_elems_dynamic_padding.x86-64.mca |   95 +
 ...ref_from_suffix_with_elems_dynamic_size.rs |   13 +
 ...from_suffix_with_elems_dynamic_size.x86-64 |   28 +
 ..._suffix_with_elems_dynamic_size.x86-64.mca |   87 +
 rust/zerocopy/benches/try_transmute.rs        |   16 +
 rust/zerocopy/benches/try_transmute.x86-64    |    9 +
 .../zerocopy/benches/try_transmute.x86-64.mca |   55 +
 .../benches/try_transmute_ref_dynamic_size.rs |   18 +
 .../try_transmute_ref_dynamic_size.x86-64     |    6 +
 .../try_transmute_ref_dynamic_size.x86-64.mca |   49 +
 .../benches/try_transmute_ref_static_size.rs  |   17 +
 .../try_transmute_ref_static_size.x86-64      |    5 +
 .../try_transmute_ref_static_size.x86-64.mca  |   47 +
 .../zerocopy/benches/write_to_dynamic_size.rs |    9 +
 .../benches/write_to_dynamic_size.x86-64      |   21 +
 .../benches/write_to_dynamic_size.x86-64.mca  |   77 +
 .../benches/write_to_prefix_dynamic_size.rs   |   12 +
 .../write_to_prefix_dynamic_size.x86-64       |   21 +
 .../write_to_prefix_dynamic_size.x86-64.mca   |   77 +
 .../benches/write_to_prefix_static_size.rs    |   12 +
 .../write_to_prefix_static_size.x86-64        |   11 +
 .../write_to_prefix_static_size.x86-64.mca    |   57 +
 rust/zerocopy/benches/write_to_static_size.rs |    9 +
 .../benches/write_to_static_size.x86-64       |   11 +
 .../benches/write_to_static_size.x86-64.mca   |   57 +
 .../benches/write_to_suffix_dynamic_size.rs   |   12 +
 .../write_to_suffix_dynamic_size.x86-64       |   22 +
 .../write_to_suffix_dynamic_size.x86-64.mca   |   79 +
 .../benches/write_to_suffix_static_size.rs    |   12 +
 .../write_to_suffix_static_size.x86-64        |   11 +
 .../write_to_suffix_static_size.x86-64.mca    |   57 +
 rust/zerocopy/benches/zero_dynamic_padding.rs |    9 +
 .../benches/zero_dynamic_padding.x86-64       |    7 +
 .../benches/zero_dynamic_padding.x86-64.mca   |   51 +
 rust/zerocopy/benches/zero_dynamic_size.rs    |    9 +
 .../zerocopy/benches/zero_dynamic_size.x86-64 |    5 +
 .../benches/zero_dynamic_size.x86-64.mca      |   47 +
 rust/zerocopy/benches/zero_static_size.rs     |    9 +
 rust/zerocopy/benches/zero_static_size.x86-64 |    4 +
 .../benches/zero_static_size.x86-64.mca       |   45 +
 rust/zerocopy/rustdoc/style.css               |   57 +
 rust/zerocopy/src/byte_slice.rs               |  434 +
 rust/zerocopy/src/byteorder.rs                | 1564 ++++
 rust/zerocopy/src/deprecated.rs               |  281 +
 rust/zerocopy/src/error.rs                    | 1350 +++
 rust/zerocopy/src/impls.rs                    | 2389 ++++++
 rust/zerocopy/src/layout.rs                   | 2225 +++++
 rust/zerocopy/src/lib.rs                      | 7612 +++++++++++++++++
 rust/zerocopy/src/macros.rs                   | 1825 ++++
 rust/zerocopy/src/pointer/inner.rs            |  754 ++
 rust/zerocopy/src/pointer/invariant.rs        |  298 +
 rust/zerocopy/src/pointer/mod.rs              |  410 +
 rust/zerocopy/src/pointer/ptr.rs              | 1586 ++++
 rust/zerocopy/src/pointer/transmute.rs        |  522 ++
 rust/zerocopy/src/ref.rs                      | 1358 +++
 rust/zerocopy/src/split_at.rs                 | 1090 +++
 rust/zerocopy/src/util/macro_util.rs          | 1310 +++
 rust/zerocopy/src/util/macros.rs              | 1067 +++
 rust/zerocopy/src/util/mod.rs                 |  938 ++
 rust/zerocopy/src/wrappers.rs                 | 1034 +++
 scripts/Makefile.build                        |    1 +
 scripts/generate_rust_analyzer.py             |   38 +-
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base-commit: 025fd4b4fd382112bd4489e5b4437a295934fc19
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2.54.0