linux-kernel - Re: [PATCH] rust: sync: add wait_interruptible

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Message-ID: <20250203115418.GB14028@noisy.programming.kicks-ass.net>
Date: Mon, 3 Feb 2025 12:54:18 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Trevor Gross <tmgross@...ch.edu>, Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rust: sync: add wait_interruptible_freezable

On Thu, Jan 30, 2025 at 11:30:44AM +0000, Alice Ryhl wrote:
> Binder allows you to freeze a process where some of its threads are
> blocked on the Binder driver. To make this work, we need to pass
> TASK_FREEZABLE when going to sleep in the appropriate places. Thus, add
> a new method wait_interruptible_freezable for the condition variable so
> that sleeps where this is supported can be marked as such.

The constraint on freezable is that you must not hold locks. There is a
lockdep check for this in the code, but it would probably make sense to
teach Rust about this constraint as well, hmm?