linux-kernel - Re: [PATCH v2] rust: enable slice_flatten feature and provide it through an extension trait

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Message-Id: <DE0LXMXWMDNI.WIHMY9TEPRVE@nvidia.com>
Date: Wed, 05 Nov 2025 17:10:47 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Alice Ryhl" <aliceryhl@...gle.com>, "Alexandre Courbot"
 <acourbot@...dia.com>
Cc: "Miguel Ojeda" <ojeda@...nel.org>, "Boqun Feng" <boqun.feng@...il.com>,
 "Gary Guo" <gary@...yguo.net>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, "Benno Lossin" <lossin@...nel.org>, "Andreas
 Hindborg" <a.hindborg@...nel.org>, "Trevor Gross" <tmgross@...ch.edu>,
 "Danilo Krummrich" <dakr@...nel.org>, "Nathan Chancellor"
 <nathan@...nel.org>, "Nicolas Schier" <nicolas.schier@...ux.dev>,
 <linux-kernel@...r.kernel.org>, <rust-for-linux@...r.kernel.org>,
 <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v2] rust: enable slice_flatten feature and provide it
 through an extension trait

On Tue Nov 4, 2025 at 11:10 PM JST, Alice Ryhl wrote:
>> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
>> index d0ee33a487be..a84b9e3171a3 100644
>> --- a/scripts/Makefile.build
>> +++ b/scripts/Makefile.build
>> @@ -308,6 +308,7 @@ $(obj)/%.lst: $(obj)/%.c FORCE
>>  
>>  # The features in this list are the ones allowed for non-`rust/` code.
>>  #
>> +#   - Stable since Rust 1.80.0: `feature(slice_flatten)`.
>>  #   - Stable since Rust 1.81.0: `feature(lint_reasons)`.
>>  #   - Stable since Rust 1.82.0: `feature(asm_const)`,
>>  #     `feature(offset_of_nested)`, `feature(raw_ref_op)`.
>> @@ -317,7 +318,7 @@ $(obj)/%.lst: $(obj)/%.c FORCE
>>  #
>>  # Please see https://github.com/Rust-for-Linux/linux/issues/2 for details on
>>  # the unstable features in use.
>> -rust_allowed_features := asm_const,asm_goto,arbitrary_self_types,lint_reasons,offset_of_nested,raw_ref_op,used_with_arg
>> +rust_allowed_features := asm_const,asm_goto,arbitrary_self_types,lint_reasons,offset_of_nested,raw_ref_op,slice_flatten,used_with_arg
>
> You should double-check, but I don't think you need to list it here
> because all uses of the unstable method are under the `rust/` directory.

Confirmed that this is not needed, thank you!