linux-kernel - Re: [PATCH 1/3] rust: completion: implement initial abstraction

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Message-ID: <aEqtexr4WwfU7rIP@pollux>
Date: Thu, 12 Jun 2025 12:35:39 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Benno Lossin <lossin@...nel.org>
Cc: gregkh@...uxfoundation.org, rafael@...nel.org, ojeda@...nel.org,
	alex.gaynor@...il.com, boqun.feng@...il.com, gary@...yguo.net,
	bjorn3_gh@...tonmail.com, benno.lossin@...ton.me,
	a.hindborg@...nel.org, aliceryhl@...gle.com, tmgross@...ch.edu,
	chrisi.schrefl@...il.com, rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>
Subject: Re: [PATCH 1/3] rust: completion: implement initial abstraction

On Thu, Jun 12, 2025 at 10:15:55AM +0200, Benno Lossin wrote:
> On Tue Jun 3, 2025 at 10:48 PM CEST, Danilo Krummrich wrote:
> > +    /// Signal all tasks waiting on this completion.
> > +    ///
> > +    /// This method wakes up all tasks waiting on this completion; after this operation the
> > +    /// completion is permanently done.
> > +    pub fn complete_all(&self) {
> > +        // SAFETY: `self.as_raw()` is a pointer to a valid `struct completion`.
> > +        unsafe { bindings::complete_all(self.as_raw()) };
> > +    }
> > +
> > +    /// Wait for completion of a task.
> > +    ///
> > +    /// This method waits for the completion of a task; it is not interruptible and there is no
> > +    /// timeout.
> 
> Another thing that we should document is weather this function returns
> immediately when `complete_all` was already called in the past.

The details are all documented in [1], which is also linked in the module
documentation of this file.

[1] https://docs.kernel.org/scheduler/completion.html