From: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
To: Miguel Ojeda <ojeda@kernel.org>,
Wedson Almeida Filho <wedsonaf@gmail.com>,
Alex Gaynor <alex.gaynor@gmail.com>
Cc: "Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <benno.lossin@proton.me>,
"Andreas Hindborg" <a.hindborg@samsung.com>,
"Alice Ryhl" <aliceryhl@google.com>,
rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
patches@lists.linux.dev, "Jonathan Corbet" <corbet@lwn.net>,
workflows@vger.kernel.org, linux-doc@vger.kernel.org
Subject: Re: [PATCH 3/3] rust: upgrade to Rust 1.73.0
Date: Thu, 5 Oct 2023 18:30:21 -0300 [thread overview]
Message-ID: <7a98dc62-924c-4b6a-844d-d6db2b9e5a3b@gmail.com> (raw)
In-Reply-To: <20231005210556.466856-4-ojeda@kernel.org>
On 10/5/23 18:05, Miguel Ojeda wrote:
> This is the next upgrade to the Rust toolchain, from 1.72.1 to 1.73.0
> (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 feature allowed to be used outside
> the `kernel` crate is still `new_uninit`, though other code to be
> upstreamed may increase the list.
>
> Please see [3] for details.
>
> # Required changes
>
> For the upgrade, the following changes are required:
>
> - Allow `internal_features` for `feature(compiler_builtins)` since
> now Rust warns about using internal compiler and standard library
> features (similar to how it also warns about incomplete ones) [4].
>
> - A cleanup for a documentation link thanks to a new `rustdoc` lint.
> See previous commits for details.
>
> - A need to make an intra-doc link to a macro explicit, due to a
> change in behavior in `rustdoc`. See previous commits for details.
>
> # `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-1730-2023-10-05 [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/compiler-team/issues/596 [4]
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
> ---
> [...]
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
next prev parent reply other threads:[~2023-10-05 21:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-05 21:05 [PATCH 0/3] Rust 1.73.0 upgrade Miguel Ojeda
2023-10-05 21:05 ` [PATCH 1/3] rust: task: remove redundant explicit link Miguel Ojeda
2023-10-05 21:29 ` Martin Rodriguez Reboredo
2023-10-06 8:17 ` Finn Behrens
2023-10-06 8:51 ` Alice Ryhl
2023-10-09 8:48 ` Vincenzo Palazzo
2023-10-05 21:05 ` [PATCH 2/3] rust: print: use explicit link in documentation Miguel Ojeda
2023-10-05 21:30 ` Martin Rodriguez Reboredo
2023-10-06 8:14 ` Finn Behrens
2023-10-06 8:52 ` Alice Ryhl
2023-10-09 8:48 ` Vincenzo Palazzo
2023-10-05 21:05 ` [PATCH 3/3] rust: upgrade to Rust 1.73.0 Miguel Ojeda
2023-10-05 21:30 ` Martin Rodriguez Reboredo [this message]
2023-10-06 9:08 ` Alice Ryhl
2023-10-09 8:49 ` Vincenzo Palazzo
2023-10-15 19:35 ` [PATCH 0/3] Rust 1.73.0 upgrade Miguel Ojeda
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