On 9/29/24 5:17 PM, Danilo Krummrich wrote:
On Sat, Sep 28, 2024 at 08:43:57PM +0100, Gary Guo wrote:On Thu, 12 Sep 2024 00:53:01 +0200 Danilo Krummrich <dakr@xxxxxxxxxx> wrote: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@xxxxxxxxxx> --- rust/Makefile | 43 +++++---------------- rust/exports.c | 1 - rust/kernel/alloc/allocator.rs | 63 +------------------------------ scripts/Makefile.build | 7 +--- scripts/generate_rust_analyzer.py | 11 +----- 5 files changed, 15 insertions(+), 110 deletions(-) diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 72b1232b1f7d..529ec5972e55 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -262,18 +262,13 @@ $(obj)/%.lst: $(obj)/%.c FORCE# Compile Rust sources (.rs)# --------------------------------------------------------------------------- - -rust_allowed_features := new_uninit -Would it make sense to throw in a soon-to-be-stable (or already-stable-but-beyond-min-rust-version) feature here to not have to remove the build system support for unstable feature directly?It's only about those two lines, right? I can only remove the `new_uninit` and leave `rust_allowed_features :=` and leave...For example, I know that const_refs_to_static might be added here soon-ish.# `--out-dir` is required to avoid temporaries being created by `rustc` in the # current working directory, which may be not accessible in the out-of-tree # modules case. rust_common_cmd = \ RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \ - -Zallow-features=$(rust_allowed_features) \...this line, I guess?
Seems like I can't, it blows up with an empty feature list. I'll keep it as it is for now. Shouldn't be a big deal to add it again, once needed.
I think this actually allow all features instead of allowing none.-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 \ diff --git a/scripts/generate_rust_analyzer.py b/scripts/generate_rust_analyzer.py index d2bc63cde8c6..09e1d166d8d2 100755 --- a/scripts/generate_rust_analyzer.py +++ b/scripts/generate_rust_analyzer.py @@ -64,13 +64,6 @@ def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs): [], )- append_crate(- "alloc", - sysroot_src / "alloc" / "src" / "lib.rs", - ["core", "compiler_builtins"], - cfg=crates_cfgs.get("alloc", []), - ) - append_crate( "macros", srctree / "rust" / "macros" / "lib.rs", @@ -96,7 +89,7 @@ def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs): append_crate( "kernel", srctree / "rust" / "kernel" / "lib.rs", - ["core", "alloc", "macros", "build_error", "bindings"], + ["core", "macros", "build_error", "bindings"], cfg=cfg, ) crates[-1]["source"] = { @@ -133,7 +126,7 @@ def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs): append_crate( name, path, - ["core", "alloc", "kernel"], + ["core", "kernel"], cfg=cfg, )
