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Date: Tue, 26 Aug 2025 22:27:00 +0200
Message-Id: <DCCN4NA8LSGD.10TKRH3LRGAEN@kernel.org>
Subject: Re: [PATCH v3 3/5] rust: scatterlist: Add abstraction for sg_table
Cc: <akpm@linux-foundation.org>, <ojeda@kernel.org>,
 <alex.gaynor@gmail.com>, <boqun.feng@gmail.com>, <gary@garyguo.net>,
 <bjorn3_gh@protonmail.com>, <lossin@kernel.org>, <a.hindborg@kernel.org>,
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 <linux-kernel@vger.kernel.org>
To: "Daniel Almeida" <daniel.almeida@collabora.com>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20250825132539.122412-1-dakr@kernel.org>
 <20250825132539.122412-4-dakr@kernel.org>
 <6625A8C0-33B2-4AFC-984B-130F8E06113D@collabora.com>
 <DCCLKO6HTCM8.YR8VE8PAXQTM@kernel.org>
 <3BD5A415-CD19-4B8E-A2A3-78F60FCC863A@collabora.com>
In-Reply-To: <3BD5A415-CD19-4B8E-A2A3-78F60FCC863A@collabora.com>

On Tue Aug 26, 2025 at 10:16 PM CEST, Daniel Almeida wrote:
> // SAFETY: It is not possible to mutate a `SGEntry` through a shared refe=
rence,
> // so it is safe to send a &SGEntry to another task.
>
> Or any variation of the wording above.
>
> In any case, I agree that this is splitting hairs a bit and I have nothin=
g
> against keeping it as-is, I just thought it be a tad clearer :)

Yeah, that's what I meant. The definition of Sync even says "Types that are=
 not
Sync are those that have interior mutability in a non-thread-safe form [...=
]".
[1].

So, both our wordings basically come down to "It's Sync because it's Sync."=
 :)

But don't get me wrong, I'm fine being a bit more verbose about this.

[1] https://doc.rust-lang.org/std/marker/trait.Sync.html