mirror of https://github.com/torvalds/linux.git
34 lines
1.1 KiB
Rust
34 lines
1.1 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2025 Google LLC.
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//! Traits for rendering or updating values exported to DebugFS.
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use crate::sync::Mutex;
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use core::fmt::{self, Debug, Formatter};
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/// A trait for types that can be written into a string.
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///
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/// This works very similarly to `Debug`, and is automatically implemented if `Debug` is
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/// implemented for a type. It is also implemented for any writable type inside a `Mutex`.
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///
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/// The derived implementation of `Debug` [may
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/// change](https://doc.rust-lang.org/std/fmt/trait.Debug.html#stability)
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/// between Rust versions, so if stability is key for your use case, please implement `Writer`
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/// explicitly instead.
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pub trait Writer {
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/// Formats the value using the given formatter.
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fn write(&self, f: &mut Formatter<'_>) -> fmt::Result;
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}
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impl<T: Writer> Writer for Mutex<T> {
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fn write(&self, f: &mut Formatter<'_>) -> fmt::Result {
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self.lock().write(f)
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}
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}
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impl<T: Debug> Writer for T {
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fn write(&self, f: &mut Formatter<'_>) -> fmt::Result {
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writeln!(f, "{self:?}")
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}
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}
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