rust: error: Add a helper to convert a C ERR_PTR to a `Result`
Some kernel C API functions return a pointer which embeds an optional `errno`. Callers are supposed to check the returned pointer with `IS_ERR()` and if this returns `true`, retrieve the `errno` using `PTR_ERR()`. Create a Rust helper function to implement the Rust equivalent: transform a `*mut T` to `Result<*mut T>`. Lina: Imported from rust-for-linux/linux, with subsequent refactoring and contributions squashed in and attributed below. Renamed the function to from_err_ptr(). Co-developed-by:Boqun Feng <boqun.feng@gmail.com> Signed-off-by:
Boqun Feng <boqun.feng@gmail.com> Co-developed-by:
Miguel Ojeda <ojeda@kernel.org> Signed-off-by:
Miguel Ojeda <ojeda@kernel.org> Co-developed-by:
Fox Chen <foxhlchen@gmail.com> Signed-off-by:
Fox Chen <foxhlchen@gmail.com> Co-developed-by:
Gary Guo <gary@garyguo.net> Signed-off-by:
Gary Guo <gary@garyguo.net> Signed-off-by:
Sven Van Asbroeck <thesven73@gmail.com> Reviewed-by:
Martin Rodriguez Reboredo <yakoyoku@gmail.com> Signed-off-by:
Asahi Lina <lina@asahilina.net> Link: https://lore.kernel.org/r/20230224-rust-error-v3-5-03779bddc02b@asahilina.net [ Add a removal of `#[allow(dead_code)]`. ] Signed-off-by:
Miguel Ojeda <ojeda@kernel.org>
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