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kbuild: rust: remove the alloc crate and GlobalAlloc

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Now that we have our own `Allocator`, `Box` and `Vec` types we can remove
Rust's `alloc` crate and the `new_uninit` unstable feature.

Also remove `Kmalloc`'s `GlobalAlloc` implementation -- we can't remove
this in a separate patch, since the `alloc` crate requires a
`#[global_allocator]` to set, that implements `GlobalAlloc`.

Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://lore.kernel.org/r/20241004154149.93856-29-dakr@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Danilo Krummrich
2024-10-04 17:41:32 +02:00
committed by Miguel Ojeda
parent 8ae740c391
commit 392e34b6bc
5 changed files with 16 additions and 108 deletions
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4
scripts/Makefile.build
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@@ -248,7 +248,7 @@ $(obj)/%.lst: $(obj)/%.c FORCE
# Compile Rust sources (.rs)
# ---------------------------------------------------------------------------
rust_allowed_features := arbitrary_self_types,lint_reasons,new_uninit
rust_allowed_features := arbitrary_self_types,lint_reasons
# `--out-dir` is required to avoid temporaries being created by `rustc` in the
# current working directory, which may be not accessible in the out-of-tree
@@ -258,7 +258,7 @@ rust_common_cmd = \
-Zallow-features=$(rust_allowed_features) \
-Zcrate-attr=no_std \
-Zcrate-attr='feature($(rust_allowed_features))' \
-Zunstable-options --extern force:alloc --extern kernel \
-Zunstable-options --extern kernel \
--crate-type rlib -L $(objtree)/rust/ \
--crate-name $(basename $(notdir $@)) \
--sysroot=/dev/null \