Linus Torvalds e3610441d1 Rust changes for v6.14 ... Toolchain and infrastructure: - Finish the move to custom FFI integer types started in the previous cycle and finally map 'long' to 'isize' and 'char' to 'u8'. Do a few cleanups on top thanks to that. - Start to use 'derive(CoercePointee)' on Rust >= 1.84.0. This is a major milestone on the path to build the kernel using only stable Rust features. In particular, previously we were using the unstable features 'coerce_unsized', 'dispatch_from_dyn' and 'unsize', and now we will use the new 'derive_coerce_pointee' one, which is on track to stabilization. This new feature is a macro that essentially expands into code that internally uses the unstable features that we were using before, without having to expose those. With it, stable Rust users, including the kernel, will be able to build custom smart pointers that work with trait objects, e.g.: fn f(p: &Arc<dyn Display>) { pr_info!("{p}\n"); } let a: Arc<dyn Display> = Arc::new(42i32, GFP_KERNEL)?; let b: Arc<dyn Display> = Arc::new("hello there", GFP_KERNEL)?; f(&a); // Prints "42". f(&b); // Prints "hello there". Together with the 'arbitrary_self_types' feature that we started using in the previous cycle, using our custom smart pointers like 'Arc' will eventually only rely in stable Rust. - Introduce 'PROCMACROLDFLAGS' environment variable to allow to link Rust proc macros using different flags than those used for linking Rust host programs (e.g. when 'rustc' uses a different C library than the host programs' one), which Android needs. - Help kernel builds under macOS with Rust enabled by accomodating other naming conventions for dynamic libraries (i.e. '.so' vs. '.dylib') which are used for Rust procedural macros. The actual support for macOS (i.e. the rest of the pieces needed) is provided out-of-tree by others, following the policy used for other parts of the kernel by Kbuild. - Run Clippy for 'rusttest' code too and clean the bits it spotted. - Provide Clippy with the minimum supported Rust version to improve the suggestions it gives. - Document 'bindgen' 0.71.0 regression. 'kernel' crate: - 'build_error!': move users of the hidden function to the documented macro, prevent such uses in the future by moving the function elsewhere and add the macro to the prelude. - 'types' module: add improved version of 'ForeignOwnable::borrow_mut' (which was removed in the past since it was problematic); change 'ForeignOwnable' pointer type to '*mut'. - 'alloc' module: implement 'Display' for 'Box' and align the 'Debug' implementation to it; add example (doctest) for 'ArrayLayout::new()'. - 'sync' module: document 'PhantomData' in 'Arc'; use 'NonNull::new_unchecked' in 'ForeignOwnable for Arc' impl. - 'uaccess' module: accept 'Vec's with different allocators in 'UserSliceReader::read_all'. - 'workqueue' module: enable run-testing a couple more doctests. - 'error' module: simplify 'from_errno()'. - 'block' module: fix formatting in code documentation (a lint to catch these is being implemented). - Avoid 'unwrap()'s in doctests, which also improves the examples by showing how kernel code is supposed to be written. - Avoid 'as' casts with 'cast{,_mut}' calls which are a bit safer. And a few other cleanups. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEPjU5OPd5QIZ9jqqOGXyLc2htIW0FAmeNeRsACgkQGXyLc2ht IW0exRAAx3ag/JaiR3n5aDBJqUX/Vi6/u+3fTiHOGp9oMFK4ZYR9rlWIr0ArU8a0 4PApTR5ozrD+lgD1gCjHikhvpacLoTcz0WD0sP8qWlSqQFiMcTXmmWQfeJc7hheE 4zyKlxswvbHjnOs/k24i5FS4E/CRpC7TJT5RkybaWVunsIps/im4xTnXfUzMhjVG SWcRaJtQA8xze9iiRlqw9EFQL6iT5gIKAe0I2i2J+zYzsY6m23fQ/8IxvglaiSDT /GIIqDscMH6drfQFRsvTtkcw0Mq64e6hlyWS9s4b9Q0IhgS0sju0qbQrfLLet75t 1r+JlBZYhQy+4LXZTgBmQ8mVR8NEurnsOullm2AoTy6EYCPvXExSv4JCXYVvgPh+ d4j/0pCeKUg9aDUtuEAUPHGQk1j7mORGf4J8jPQXla/7/YfqJvluycpMe54gLZpA FU24aqtb5/q3/Gqm8omKe/7FdYsu44E1haiP77bhNeYM3pWJrlIovBCafBtc1mQM lMtK6EjiQqrz1kEWutx+RQeeiir1G++GlVNGO2LSdNi/6qfjfBQM9dEqsCc8i3XL rsLL368SEKQENhSNJFceg6RX37WPwcyIkHAeZ91ijSz6W4I5HtUZpD3UPcgJoiaS xuOi44bR6Lt0zXF7eaXZTUh2gf8o++tsgfc4OZPaZ3azn6Y3pXw= =VLNX -----END PGP SIGNATURE----- Merge tag 'rust-6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux Pull rust updates from Miguel Ojeda: "Toolchain and infrastructure: - Finish the move to custom FFI integer types started in the previous cycle and finally map 'long' to 'isize' and 'char' to 'u8'. Do a few cleanups on top thanks to that. - Start to use 'derive(CoercePointee)' on Rust >= 1.84.0. This is a major milestone on the path to build the kernel using only stable Rust features. In particular, previously we were using the unstable features 'coerce_unsized', 'dispatch_from_dyn' and 'unsize', and now we will use the new 'derive_coerce_pointee' one, which is on track to stabilization. This new feature is a macro that essentially expands into code that internally uses the unstable features that we were using before, without having to expose those. With it, stable Rust users, including the kernel, will be able to build custom smart pointers that work with trait objects, e.g.: fn f(p: &Arc<dyn Display>) { pr_info!("{p}\n"); } let a: Arc<dyn Display> = Arc::new(42i32, GFP_KERNEL)?; let b: Arc<dyn Display> = Arc::new("hello there", GFP_KERNEL)?; f(&a); // Prints "42". f(&b); // Prints "hello there". Together with the 'arbitrary_self_types' feature that we started using in the previous cycle, using our custom smart pointers like 'Arc' will eventually only rely in stable Rust. - Introduce 'PROCMACROLDFLAGS' environment variable to allow to link Rust proc macros using different flags than those used for linking Rust host programs (e.g. when 'rustc' uses a different C library than the host programs' one), which Android needs. - Help kernel builds under macOS with Rust enabled by accomodating other naming conventions for dynamic libraries (i.e. '.so' vs. '.dylib') which are used for Rust procedural macros. The actual support for macOS (i.e. the rest of the pieces needed) is provided out-of-tree by others, following the policy used for other parts of the kernel by Kbuild. - Run Clippy for 'rusttest' code too and clean the bits it spotted. - Provide Clippy with the minimum supported Rust version to improve the suggestions it gives. - Document 'bindgen' 0.71.0 regression. 'kernel' crate: - 'build_error!': move users of the hidden function to the documented macro, prevent such uses in the future by moving the function elsewhere and add the macro to the prelude. - 'types' module: add improved version of 'ForeignOwnable::borrow_mut' (which was removed in the past since it was problematic); change 'ForeignOwnable' pointer type to '*mut'. - 'alloc' module: implement 'Display' for 'Box' and align the 'Debug' implementation to it; add example (doctest) for 'ArrayLayout::new()' - 'sync' module: document 'PhantomData' in 'Arc'; use 'NonNull::new_unchecked' in 'ForeignOwnable for Arc' impl. - 'uaccess' module: accept 'Vec's with different allocators in 'UserSliceReader::read_all'. - 'workqueue' module: enable run-testing a couple more doctests. - 'error' module: simplify 'from_errno()'. - 'block' module: fix formatting in code documentation (a lint to catch these is being implemented). - Avoid 'unwrap()'s in doctests, which also improves the examples by showing how kernel code is supposed to be written. - Avoid 'as' casts with 'cast{,_mut}' calls which are a bit safer. And a few other cleanups" * tag 'rust-6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux: (32 commits) kbuild: rust: add PROCMACROLDFLAGS rust: uaccess: generalize userSliceReader to support any Vec rust: kernel: add improved version of `ForeignOwnable::borrow_mut` rust: kernel: reorder `ForeignOwnable` items rust: kernel: change `ForeignOwnable` pointer to mut rust: arc: split unsafe block, add missing comment rust: types: avoid `as` casts rust: arc: use `NonNull::new_unchecked` rust: use derive(CoercePointee) on rustc >= 1.84.0 rust: alloc: add doctest for `ArrayLayout::new()` rust: init: update `stack_try_pin_init` examples rust: error: import `kernel`'s `LayoutError` instead of `core`'s rust: str: replace unwraps with question mark operators rust: page: remove unnecessary helper function from doctest rust: rbtree: remove unwrap in asserts rust: init: replace unwraps with question mark operators rust: use host dylib naming convention to support macOS rust: add `build_error!` to the prelude rust: kernel: move `build_error` hidden function to prevent mistakes rust: use the `build_error!` macro, not the hidden function ...		2025-01-21 17:48:03 -08:00
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drm	Rust changes for v6.14	2025-01-21 17:48:03 -08:00
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