linux-kernel - Re: [PATCH v2 1/4] rust: io: Add big-endian read and write functions

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Message-Id: <DG7E62FRLFG8.2WLEEY8VX9PRO@kernel.org>
Date: Thu, 05 Feb 2026 23:46:15 +0100
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Gary Guo" <gary@...yguo.net>
Cc: "Daniel Almeida" <daniel.almeida@...labora.com>, "Link Mauve"
 <linkmauve@...kmauve.fr>, <rust-for-linux@...r.kernel.org>, "Madhavan
 Srinivasan" <maddy@...ux.ibm.com>, "Michael Ellerman" <mpe@...erman.id.au>,
 "Nicholas Piggin" <npiggin@...il.com>, "Christophe Leroy (CS GROUP)"
 <chleroy@...nel.org>, "Srinivas Kandagatla" <srini@...nel.org>, "Miguel
 Ojeda" <ojeda@...nel.org>, "Boqun Feng" <boqun@...nel.org>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, "Benno Lossin"
 <lossin@...nel.org>, "Andreas Hindborg" <a.hindborg@...nel.org>, "Alice
 Ryhl" <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>, "Ard
 Biesheuvel" <ardb@...nel.org>, "Martin K. Petersen"
 <martin.petersen@...cle.com>, "Eric Biggers" <ebiggers@...gle.com>, "Greg
 Kroah-Hartman" <gregkh@...uxfoundation.org>, "Lyude Paul"
 <lyude@...hat.com>, "Asahi Lina" <lina+kernel@...hilina.net>, "Viresh
 Kumar" <viresh.kumar@...aro.org>, "Lorenzo Stoakes"
 <lorenzo.stoakes@...cle.com>, "Tamir Duberstein" <tamird@...nel.org>,
 "FUJITA Tomonori" <fujita.tomonori@...il.com>,
 <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
 <officialTechflashYT@...il.com>, "Ash Logan" <ash@...quark.com>, "Roberto
 Van Eeden" <rw-r-r-0644@...tonmail.com>,
 Jonathan Neuschäfer <j.neuschaefer@....net>
Subject: Re: [PATCH v2 1/4] rust: io: Add big-endian read and write
 functions

On Thu Feb 5, 2026 at 11:31 PM CET, Gary Guo wrote:
> I proposed the wrapper type because majority of devices won't need BE support,
> so adding complexity to Mmio itself is not ideal. It is also generic, so it can
> work with any IO backends, so for example, you can have `BigEndian<Pio>` and
> `BigEndian<Mmio>` and you don't need to duplicate your endianness support for
> both backends.

That implies that we swap bytes manually? That would be a waste if the CPU and
device are big-endian.