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rust: error: add
From
implementations for Error
Add a set of `From` implementations for the `Error` kernel type. These implementations allow to easily convert from standard Rust error types to the usual kernel errors based on one of the `E*` integer codes. On top of that, the question mark Rust operator (`?`) implicitly performs a conversion on the error value using the `From` trait when propagating. Thus it is extra convenient to use. For instance, a kernel function that needs to convert a `i64` into a `i32` and to bubble up the error as a kernel error may write: fn f(x: i64) -> Result<...> { ... let y = i32::try_from(x)?; ... } which will transform the `TryFromIntError` into an `Err(EINVAL)`. Co-developed-by: Adam Bratschi-Kaye <[email protected]> Signed-off-by: Adam Bratschi-Kaye <[email protected]> Co-developed-by: Nándor István Krácser <[email protected]> Signed-off-by: Nándor István Krácser <[email protected]> Signed-off-by: Wedson Almeida Filho <[email protected]> Reviewed-by: Finn Behrens <[email protected]> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <[email protected]>
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