linux-kernel - Re: [PATCH v5 0/6] rust: reduce pointer casts, enable related lints

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Message-ID: <D8PAQXHJDVQE.36QKQGBVVL4QU@proton.me>
Date: Tue, 25 Mar 2025 11:05:40 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Tamir Duberstein <tamird@...il.com>
Cc: Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 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>, Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, Brendan Higgins <brendan.higgins@...ux.dev>, David Gow <davidgow@...gle.com>, Rae Moar <rmoar@...gle.com>, Bjorn Helgaas <bhelgaas@...gle.com>, Luis Chamberlain <mcgrof@...nel.org>, Russ Weight <russ.weight@...ux.dev>, Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
	linux-pci@...r.kernel.org, linux-block@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 0/6] rust: reduce pointer casts, enable related lints

On Mon Mar 24, 2025 at 10:59 PM CET, Tamir Duberstein wrote:
> On Mon, Mar 24, 2025 at 5:55 PM Benno Lossin <benno.lossin@...ton.me> wrote:
>> On Mon Mar 24, 2025 at 9:55 PM CET, Tamir Duberstein wrote:
>> > On Mon, Mar 24, 2025 at 4:16 PM Benno Lossin <benno.lossin@...ton.me> wrote:
>> >> * `cast_lossless` (maybe this catches some of the `num as int_type`
>> >>   conversions I mentioned above)
>> >
>> > Yeah, suggested the same above. I had hoped this would deal with the
>> > char as u32 pattern but it did not.
>>
>> Aw that's a shame. Maybe we should create a clippy issue for that,
>> thoughts?
>
> Yeah, it's not clear to me why it isn't covered by `cast_lossless`.
> Might just be a bug. Want to file it?

Done: https://github.com/rust-lang/rust-clippy/issues/14469

>> >> I'll leave it up to you what you want to do with this: add it to this
>> >> series, make a new one, or let someone else handle it. If you don't want
>> >> to handle it, let me know, then I'll create a good-first-issue :)
>> >
>> > I'll add a patch for `cast_lossless` -- the rest should probably go
>> > into an issue.
>>
>> Do you mind filing the issue? Then you can decide yourself what you want
>> to do yourself vs what you want to leave for others. Feel free to copy
>> from my mail summary.
>
> Well, I don't really know what's left to do. We're pretty close at
> this point to having enabled everything but the nukes. Then there's
> the strict provenance thing, which I suppose we can write down.

Yes, but there are also these from my original mail:
* `shared_ref as *const _` (for example in rust/kernel/uaccess.rs:247,
  rust/kernel/str.rs:32 and rust/kernel/fs/file.rs:367), these we can
  replace with `let ptr: *const ... = shared_ref;`. Don't know if there
  is a clippy lint for this.

And the other points (haven't taken a look at the other series you
submitted, so I don't know to what extend you fixed the other `as` casts
I mentioned). So I figured you might know which ones we still have after
applying all your patches :)

---
Cheers,
Benno