f438c1dd9e
It may be unclear for readers which upstream Rust version these files are based on. They may be unaware that they are intended to match the minimum (and only, so far) supported version of Rust in the kernel. Thus clarify it. Reviewed-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Reviewed-by: Gary Guo <gary@garyguo.net> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Tested-by: Ariel Miculas <amiculas@cisco.com> Tested-by: David Gow <davidgow@google.com> Tested-by: Boqun Feng <boqun.feng@gmail.com> Link: https://lore.kernel.org/r/20230418214347.324156-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
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alloc
These source files come from the Rust standard library, hosted in the https://github.com/rust-lang/rust repository, licensed under "Apache-2.0 OR MIT" and adapted for kernel use. For copyright details, see https://github.com/rust-lang/rust/blob/master/COPYRIGHT.
Please note that these files should be kept as close as possible to upstream. In general, only additions should be performed (e.g. new methods). Eventually, changes should make it into upstream so that, at some point, this fork can be dropped from the kernel tree.
The Rust upstream version on top of which these files are based matches
the output of scripts/min-tool-version.sh rustc.
Rationale
On one hand, kernel folks wanted to keep alloc in-tree to have more
freedom in both workflow and actual features if actually needed
(e.g. receiver types if we ended up using them), which is reasonable.
On the other hand, Rust folks wanted to keep alloc as close as
upstream as possible and avoid as much divergence as possible, which
is also reasonable.
We agreed on a middle-ground: we would keep a subset of alloc
in-tree that would be as small and as close as possible to upstream.
Then, upstream can start adding the functions that we add to alloc
etc., until we reach a point where the kernel already knows exactly
what it needs in alloc and all the new methods are merged into
upstream, so that we can drop alloc from the kernel tree and go back
to using the upstream one.
By doing this, the kernel can go a bit faster now, and Rust can slowly incorporate and discuss the changes as needed.