Re: [PATCH v4 1/3] rust: ptr: add `KnownSize` trait to support DST size info extraction

["Benno Lossin" <lossin@kernel.org>]

On Mon Mar 2, 2026 at 8:42 PM CET, Gary Guo wrote:
> On Mon Mar 2, 2026 at 6:57 PM GMT, Benno Lossin wrote:
>> On Mon Mar 2, 2026 at 5:42 PM CET, Gary Guo wrote:
>>> From: Gary Guo <gary@garyguo.net>
>>>
>>> Add a `KnownSize` trait which is used obtain a size from a raw pointer's
>>> metadata. This makes it possible to obtain size information on a raw slice
>>> pointer. This is similar to Rust `core::mem::size_of_val_raw` which is not
>>> yet stable.
>>>
>>> Signed-off-by: Gary Guo <gary@garyguo.net>
>>> ---
>>>  rust/kernel/lib.rs |  1 +
>>>  rust/kernel/ptr.rs | 27 ++++++++++++++++++++++++++-
>>>  2 files changed, 27 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
>>> index 3da92f18f4ee..510cc7fe4961 100644
>>> --- a/rust/kernel/lib.rs
>>> +++ b/rust/kernel/lib.rs
>>> @@ -20,6 +20,7 @@
>>>  #![feature(generic_nonzero)]
>>>  #![feature(inline_const)]
>>>  #![feature(pointer_is_aligned)]
>>> +#![feature(slice_ptr_len)]
>>
>> Oh and this is also missing a stability comment.
>
> I don't see anything missing here? This is in the same group as other features
> that are stable in 1.79.

I didn't look at the file & only at the hunk.

Cheers,
Benno