linux-kernel - Re: [PATCH] rust: upgrade to Rust 1.74.1

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Date:   Thu, 14 Dec 2023 10:49:05 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>
Cc:     Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Alice Ryhl <aliceryhl@...gle.com>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev
Subject: Re: [PATCH] rust: upgrade to Rust 1.74.1

On 12/14/23 06:29, Miguel Ojeda wrote:
> This is the next upgrade to the Rust toolchain, from 1.73.0 to 1.74.1
> (i.e. the latest) [1].
> 
> See the upgrade policy [2] and the comments on the first upgrade in
> commit 3ed03f4da06e ("rust: upgrade to Rust 1.68.2").
> 
> # Unstable features
> 
> No unstable features (that we use) were stabilized.
> 
> Therefore, the only unstable features allowed to be used outside the
> `kernel` crate are still `new_uninit,offset_of`, though other code to
> be upstreamed may increase the list (e.g. `offset_of` was added recently).
> 
> Please see [3] for details.
> 
> # Other improvements
> 
> Rust 1.74.0 allows to use `#[repr(Rust)]` explicitly [4], which can be
> useful to be explicit about particular cases that would normally use
> e.g. the C representation, such as silencing lints like the upcoming
> additions we requested [5] to the `no_mangle_with_rust_abi` Clippy lint
> (which in turn triggered the `#[repr(Rust)]` addition).
> 
> Rust 1.74.0 includes a fix for one of the false negative cases we reported
> in Clippy's `disallowed_macros` lint [6] that we would like to use in
> the future.
> 
> Rust 1.74.1 fixes an ICE that the Apple AGX GPU driver was hitting [7].
> 
> # Required changes
> 
> For this upgrade, no changes were required (i.e. on our side).
> 
> # `alloc` upgrade and reviewing
> 
> The vast majority of changes are due to our `alloc` fork being upgraded
> at once.
> 
> There are two kinds of changes to be aware of: the ones coming from
> upstream, which we should follow as closely as possible, and the updates
> needed in our added fallible APIs to keep them matching the newer
> infallible APIs coming from upstream.
> 
> Instead of taking a look at the diff of this patch, an alternative
> approach is reviewing a diff of the changes between upstream `alloc` and
> the kernel's. This allows to easily inspect the kernel additions only,
> especially to check if the fallible methods we already have still match
> the infallible ones in the new version coming from upstream.
> 
> Another approach is reviewing the changes introduced in the additions in
> the kernel fork between the two versions. This is useful to spot
> potentially unintended changes to our additions.
> 
> To apply these approaches, one may follow steps similar to the following
> to generate a pair of patches that show the differences between upstream
> Rust and the kernel (for the subset of `alloc` we use) before and after
> applying this patch:
> 
>      # Get the difference with respect to the old version.
>      git -C rust checkout $(linux/scripts/min-tool-version.sh rustc)
>      git -C linux ls-tree -r --name-only HEAD -- rust/alloc |
>          cut -d/ -f3- |
>          grep -Fv README.md |
>          xargs -IPATH cp rust/library/alloc/src/PATH linux/rust/alloc/PATH
>      git -C linux diff --patch-with-stat --summary -R > old.patch
>      git -C linux restore rust/alloc
> 
>      # Apply this patch.
>      git -C linux am rust-upgrade.patch
> 
>      # Get the difference with respect to the new version.
>      git -C rust checkout $(linux/scripts/min-tool-version.sh rustc)
>      git -C linux ls-tree -r --name-only HEAD -- rust/alloc |
>          cut -d/ -f3- |
>          grep -Fv README.md |
>          xargs -IPATH cp rust/library/alloc/src/PATH linux/rust/alloc/PATH
>      git -C linux diff --patch-with-stat --summary -R > new.patch
>      git -C linux restore rust/alloc
> 
> Now one may check the `new.patch` to take a look at the additions (first
> approach) or at the difference between those two patches (second
> approach). For the latter, a side-by-side tool is recommended.
> 
> Link: https://github.com/rust-lang/rust/blob/stable/RELEASES.md#version-1741-2023-12-07 [1]
> Link: https://rust-for-linux.com/rust-version-policy [2]
> Link: https://github.com/Rust-for-Linux/linux/issues/2 [3]
> Link: https://github.com/rust-lang/rust/pull/114201 [4]
> Link: https://github.com/rust-lang/rust-clippy/issues/11219 [5]
> Link: https://github.com/rust-lang/rust-clippy/issues/11431 [6]
> Link: https://github.com/rust-lang/rust/issues/117976#issuecomment-1822225691 [7]
> Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
> ---
> [...]
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>