linux-kernel - Re: [PATCH v3 05/10] rust: uaccess: add UserSliceWriter::write_slice

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Message-Id: <DDXFFQCZJW8Y.3GMX8666EJQ2I@nvidia.com>
Date: Sat, 01 Nov 2025 23:27:17 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Miguel Ojeda" <miguel.ojeda.sandonis@...il.com>, "Alice Ryhl"
 <aliceryhl@...gle.com>
Cc: "Danilo Krummrich" <dakr@...nel.org>, <gregkh@...uxfoundation.org>,
 <rafael@...nel.org>, <ojeda@...nel.org>, <alex.gaynor@...il.com>,
 <boqun.feng@...il.com>, <gary@...yguo.net>, <bjorn3_gh@...tonmail.com>,
 <lossin@...nel.org>, <a.hindborg@...nel.org>, <tmgross@...ch.edu>,
 <mmaurer@...gle.com>, <rust-for-linux@...r.kernel.org>,
 <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 05/10] rust: uaccess: add
 UserSliceWriter::write_slice_file()

On Sat Oct 25, 2025 at 3:02 AM JST, Miguel Ojeda wrote:
> On Thu, Oct 23, 2025 at 1:20 PM Alice Ryhl <aliceryhl@...gle.com> wrote:
>>
>> I would love to have infallible conversions from usize to u64 (and u32
>> to usize), but we can't really modify the stdlib to add them.
>
> I don't have a link at hand now, but we already (recently too, I
> think) discussed having these "we know it is infallible in the kernel"
> conversions. Maybe there was a patch posted even.
>
> Otherwise, I will create a good first issue.

Are you referring to this discussion?

https://lore.kernel.org/rust-for-linux/DDK4KADWJHMG.1FUPL3SDR26XF@kernel.org/

If so, I have posted something along those lines:

https://lore.kernel.org/rust-for-linux/20251029-nova-as-v3-4-6a30c7333ad9@nvidia.com/

We planned to have it stew in Nova for a bit, but I don't mind moving
this to the core code if you think that looks good enough.