linux-kernel - Re: [RFC 2/5] rust: sync: Arc: Introduces ArcInner::count()

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Date:   Fri, 3 Feb 2023 06:22:15 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Peter Zijlstra <peterz@...radead.org>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Vincenzo Palazzo <vincenzopalazzodev@...il.com>
Subject: Re: [RFC 2/5] rust: sync: Arc: Introduces ArcInner::count()

On Thu, Feb 02, 2023 at 10:47:12PM +0100, Miguel Ojeda wrote:
> On Thu, Feb 2, 2023 at 5:52 PM Boqun Feng <boqun.feng@...il.com> wrote:
> >
> > As I said, I'm open to remove the printing of the refcount, and if you
> > and Peter think maybe it's OK to do that after the explanation above,
> 
> Perhaps part of the confusion came from the overloaded "safe" term.
> 
> When Gary and Boqun used the term "safe", they meant it in the Rust
> sense, i.e. calling the method will not allow to introduce undefined
> behavior. While I think Peter and Greg are using the term to mean
> something different.

Yes, I mean it in a "this is not giving you the value you think you are
getting and you can not rely on it for anything at all as it is going to
be incorrect" meaning.

Which in kernel code means "this is not something you should do".

thanks,

greg k-h