linux-kernel - Re: [PATCH v2 3/6] rust: arc: split unsafe block, add missing comment

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Message-ID: <CAH5fLgjukqj49UHw33uJewc5Z5q=_f4uXzv2jyQ2=2eFCyWa=A@mail.gmail.com>
Date: Fri, 8 Nov 2024 13:47:15 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Tamir Duberstein <tamird@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	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>, Danilo Krummrich <dakr@...nel.org>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/6] rust: arc: split unsafe block, add missing comment

On Fri, Nov 8, 2024 at 1:41 PM Tamir Duberstein <tamird@...il.com> wrote:
>
> On Fri, Nov 8, 2024 at 7:37 AM Alice Ryhl <aliceryhl@...gle.com> wrote:
> > You could write `unsafe { (*self.ptr.as_ptr()).refcount.get() }` to
> > avoid the as_ref call.
>
> Doesn't `(*self.ptr.as_ptr())` have the same problem?

It's not quite the same. Both `*ptr` and `(*ptr).field` are place
expressions which do not inherently involve the creation of a
reference in the way that `NonNull::as_ref` does.

Alice