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rust: error: Add from_result() helper
Add a helper function to easily return C result codes from a Rust function that calls functions which return a Result<T>. Lina: Imported from rust-for-linux/rust, originally developed by Wedson as part of file_operations.rs. Added the allow() flags since there is no user in the kernel crate yet and fixed a typo in a comment. Replaced the macro with a function taking a closure, per discussion on the ML. Co-developed-by: Fox Chen <[email protected]> Signed-off-by: Fox Chen <[email protected]> Co-developed-by: Miguel Ojeda <[email protected]> Signed-off-by: Miguel Ojeda <[email protected]> Signed-off-by: Wedson Almeida Filho <[email protected]> Reviewed-by: Martin Rodriguez Reboredo <[email protected]> Signed-off-by: Asahi Lina <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Miguel Ojeda <[email protected]>
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