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The `Cow` type [1] requires that its generic parameter type implements the `ToOwned` trait [2], which provides a method to create owned data from borrowed data, usually by cloning. However, it is infallible, and thus in most cases it is not useful for the kernel. [3] Therefore, introduce `cfg(no_borrow)` to remove the `borrow` module (which contains `ToOwned` and `Cow`) from `alloc`. Link: https://doc.rust-lang.org/alloc/borrow/enum.Cow.html [1] Link: https://doc.rust-lang.org/alloc/borrow/trait.ToOwned.html [2] Link: https://lore.kernel.org/rust-for-linux/20221204103153.117675b1@GaryWorkstation/ [3] Cc: Gary Guo <gary@garyguo.net> Cc: Wedson Almeida Filho <wedsonaf@gmail.com> Cc: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Miguel Ojeda <ojeda@kernel.org> Reviewed-by: Wei Liu <wei.liu@kernel.org> Reviewed-by: Finn Behrens <fin@nyantec.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.