netdev - Re: [PATCH net-next v7 2/5] rust: net::phy add module_phy

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Date: Fri, 17 Nov 2023 09:39:08 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: fujita.tomonori@...il.com
Cc: andrew@...n.ch, benno.lossin@...ton.me, miguel.ojeda.sandonis@...il.com, 
	netdev@...r.kernel.org, rust-for-linux@...r.kernel.org, tmgross@...ch.edu, 
	wedsonaf@...il.com, Alice Ryhl <aliceryhl@...gle.com>
Subject: Re: [PATCH net-next v7 2/5] rust: net::phy add module_phy_driver macro

FUJITA Tomonori <fujita.tomonori@...il.com> writes:
> This macro creates an array of kernel's `struct phy_driver` and
> registers it. This also corresponds to the kernel's
> `MODULE_DEVICE_TABLE` macro, which embeds the information for module
> loading into the module binary file.
> 
> A PHY driver should use this macro.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>

A few minor nits:

> +    (drivers: [$($driver:ident),+], device_table: [$($dev:expr),+], $($f:tt)*) => {

Here, you can add $(,)? to allow trailing commas when the macro is used.
Like this:

(drivers: [$($driver:ident),+ $(,)?], device_table: [$($dev:expr),+ $(,)?], $($f:tt)*) => {


> +            ::kernel::bindings::mdio_device_id {

Here, I recommend `$crate` instead of `::kernel`.


> +/// #[no_mangle]
> +/// static __mod_mdio__phydev_device_table: [::kernel::bindings::mdio_device_id; 2] = [
> +///     ::kernel::bindings::mdio_device_id {
> +///         phy_id: 0x003b1861,
> +///         phy_id_mask: 0xffffffff,
> +///     },
> +///     ::kernel::bindings::mdio_device_id {
> +///         phy_id: 0,
> +///         phy_id_mask: 0,
> +///     },
> +/// ];

I'd probably put a safety comment on the `#[no_mangle]` invocation to say that
"C will not read off the end of this constant since the last element is zero".

Alice