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Message-ID: <87h69rpvja.fsf@kernel.org>
Date: Fri, 04 Oct 2024 20:34:01 +0200
From: Andreas Hindborg <a.hindborg@...nel.org>
To: "Gary Guo" <gary@...yguo.net>
Cc: "Boqun Feng" <boqun.feng@...il.com>, "Miguel Ojeda" <ojeda@...nel.org>,
"Alex Gaynor" <alex.gaynor@...il.com>, Björn Roy Baron
<bjorn3_gh@...tonmail.com>, "Benno Lossin" <benno.lossin@...ton.me>,
"Alice Ryhl" <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>,
"Jens Axboe" <axboe@...nel.dk>, "Will Deacon" <will@...nel.org>, "Peter
Zijlstra" <peterz@...radead.org>, "Mark Rutland" <mark.rutland@....com>,
<linux-block@...r.kernel.org>, <rust-for-linux@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] rust: block: convert `block::mq` to use `Refcount`
Hi Gary,
"Gary Guo" <gary@...yguo.net> writes:
[...]
> // SAFETY: All instances of `Request<T>` are reference counted. This
> // implementation of `AlwaysRefCounted` ensure that increments to the ref count
> // keeps the object alive in memory at least until a matching reference count
> // decrement is executed.
> unsafe impl<T: Operations> AlwaysRefCounted for Request<T> {
> fn inc_ref(&self) {
> - let refcount = &self.wrapper_ref().refcount();
> -
> - #[cfg_attr(not(CONFIG_DEBUG_MISC), allow(unused_variables))]
> - let updated = atomic_relaxed_op_unless(refcount, |x| x + 1, 0);
> -
> - #[cfg(CONFIG_DEBUG_MISC)]
> - if !updated {
> - panic!("Request refcount zero on clone")
> - }
> + self.wrapper_ref().refcount().inc();
What happened to the debug code?
BR Andreas
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