rust: Enable the new_uninit feature for kernel and driver crates

The unstable new_uninit feature enables various library APIs to create
uninitialized containers, such as `Box::assume_init()`. This is
necessary to build abstractions that directly initialize memory at the
target location, instead of doing copies through the stack.

Will be used by the DRM scheduler abstraction in the kernel crate, and
by field-wise initialization (e.g. using `place!()` or a future
replacement macro which may itself live in `kernel`) in driver crates.

Link: https://github.com/Rust-for-Linux/linux/issues/879
Link: https://github.com/Rust-for-Linux/linux/issues/2
Link: https://github.com/rust-lang/rust/issues/63291
Signed-off-by: Asahi Lina <lina@asahilina.net>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Link: https://lore.kernel.org/r/20230224-rust-new_uninit-v1-1-c951443d9e26@asahilina.net
[ Reworded to use `Link` tags. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index 223564f9f0cc38ef8150ac4d0964d79a496f4a99..1118cd3e0b5f52be6110fda86c9d5fc998d8f768 100644 (file)
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -17,6 +17,7 @@
 #![feature(core_ffi_c)]
 #![feature(dispatch_from_dyn)]
 #![feature(generic_associated_types)]
+#![feature(new_uninit)]
 #![feature(receiver_trait)]
 #![feature(unsize)]
 

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 76323201232a5402b8918fb4cbc27de20701a766..1364e3d905fc62bee8c3deeecbb8f72a6f2bee14 100644 (file)
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -277,7 +277,7 @@ $(obj)/%.lst: $(src)/%.c FORCE
 # Compile Rust sources (.rs)
 # ---------------------------------------------------------------------------
 
-rust_allowed_features := core_ffi_c
+rust_allowed_features := core_ffi_c,new_uninit
 
 rust_common_cmd = \
        RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \