linux-kernel - Re: [PATCH 04/10] gpu: nova-core: Add a slice-buffer (sbuffer) datastructure

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aL1kbG0YYy0FQCGM@google.com>
Date: Sun, 7 Sep 2025 10:54:36 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Alistair Popple <apopple@...dia.com>
Cc: dri-devel@...ts.freedesktop.org, dakr@...nel.org, acourbot@...dia.com, 
	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>, Benno Lossin <lossin@...nel.org>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, John Hubbard <jhubbard@...dia.com>, 
	Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>, linux-kernel@...r.kernel.org, 
	nouveau@...ts.freedesktop.org
Subject: Re: [PATCH 04/10] gpu: nova-core: Add a slice-buffer (sbuffer) datastructure

On Wed, Aug 27, 2025 at 06:20:01PM +1000, Alistair Popple wrote:
> From: Joel Fernandes <joelagnelf@...dia.com>
> 
> A data structure that can be used to write across multiple slices which
> may be out of order in memory. This lets SBuffer user correctly and
> safely write out of memory order, without error-prone tracking of
> pointers/offsets.
> 
>  let mut buf1 = [0u8; 3];
>  let mut buf2 = [0u8; 5];
>  let mut sbuffer = SBuffer::new([&mut buf1[..], &mut buf2[..]]);
> 
>  let data = b"hellowo";
>  let result = sbuffer.write(data);
> 
> An internal conversion of gsp.rs to use this resulted in a nice -ve delta:
> gsp.rs: 37 insertions(+), 99 deletions(-)
> 
> Co-developed-by: Alistair Popple <apopple@...dia.com>
> Signed-off-by: Alistair Popple <apopple@...dia.com>
> Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>

This seems like duplication of the logic in rust/kernel/iov_iter.rs [1].

Alice

[1]: https://lore.kernel.org/r/20250822-iov-iter-v5-0-6ce4819c2977@google.com