linux-kernel - Re: [PATCH V3] implement `ww_mutex` abstraction for the Rust tree

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Message-ID: <20250619141401.GI1613376@noisy.programming.kicks-ass.net>
Date: Thu, 19 Jun 2025 16:14:01 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Onur Özkan <work@...rozkan.dev>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com, will@...nel.org, boqun.feng@...il.com,
	longman@...hat.com, ojeda@...nel.org, alex.gaynor@...il.com,
	gary@...yguo.net, bjorn3_gh@...tonmail.com, lossin@...nel.org,
	a.hindborg@...nel.org, aliceryhl@...gle.com, tmgross@...ch.edu,
	dakr@...nel.org, thatslyude@...il.com
Subject: Re: [PATCH V3] implement `ww_mutex` abstraction for the Rust tree

On Thu, Jun 19, 2025 at 05:06:56PM +0300, Onur Özkan wrote:
> +bool rust_helper_ww_mutex_is_locked(struct ww_mutex *lock)
> +{
> +	return ww_mutex_is_locked(lock);
> +}

Do we really need this? In general I dislike all the _is_locked()
functions and would ideally like to remove them.

Pretty much the only useful pattern for any of the _is_locked()
functions is:

  WARN_ON_ONCE(!foo_is_locked(&foo));

Any other use is dodgy as heck.