linux-kernel - Re: [PATCH v2 2/4] rust: nvmem: Add an abstraction for nvmem providers

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Message-Id: <DG6A3L2W1YC0.YOB6BUMGG38F@kernel.org>
Date: Wed, 04 Feb 2026 16:22:16 +0100
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Link Mauve" <linkmauve@...kmauve.fr>
Cc: <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>, "Gary Guo"
 <gary@...yguo.net>, 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>, "Daniel Almeida"
 <daniel.almeida@...labora.com>, "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 2/4] rust: nvmem: Add an abstraction for nvmem
 providers

On Wed Feb 4, 2026 at 5:04 AM CET, Link Mauve wrote:
> +impl Device {
> +    /// Register a managed nvmem provider on the given device.
> +    pub fn nvmem_register<T>(&self, mut config: NvmemConfig<T>, priv_: &T::Priv)
> +    where
> +        T: NvmemProvider + Default,
> +    {
> +        // FIXME: The last cast to mut indicates some unsoundness here.
> +        config.inner.priv_ = core::ptr::from_ref(priv_).cast::<c_void>().cast_mut();
> +        config.inner.dev = self.as_raw();
> +        config.inner.reg_read = Some(NvmemConfig::<T>::reg_read);
> +        config.inner.reg_write = Some(NvmemConfig::<T>::reg_write);
> +        // SAFETY: Both self and config can’t be null here, and should have the correct type.
> +        unsafe { bindings::devm_nvmem_register(self.as_raw(), &config.inner) };
> +    }
> +}

This should not be a method on the generic device type. Typically we use a
Registration struct for this, i.e. this would become
nvmem::Registration::register().