linux-kernel - Re: [PATCH v2 1/5] rust: phy: implement `Send` for `Registration`

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Message-Id: <20240329.005352.498033770146111357.fujita.tomonori@gmail.com>
Date: Fri, 29 Mar 2024 00:53:52 +0000 (UTC)
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: wedsonaf@...il.com
Cc: rust-for-linux@...r.kernel.org, ojeda@...nel.org,
 alex.gaynor@...il.com, boqun.feng@...il.com, gary@...yguo.net,
 bjorn3_gh@...tonmail.com, benno.lossin@...ton.me, a.hindborg@...sung.com,
 aliceryhl@...gle.com, linux-kernel@...r.kernel.org,
 walmeida@...rosoft.com, fujita.tomonori@...il.com, tmgross@...ch.edu,
 netdev@...r.kernel.org
Subject: Re: [PATCH v2 1/5] rust: phy: implement `Send` for `Registration`

Hi,

On Thu, 28 Mar 2024 16:54:53 -0300
Wedson Almeida Filho <wedsonaf@...il.com> wrote:

> From: Wedson Almeida Filho <walmeida@...rosoft.com>
> 
> In preparation for requiring `Send` for `Module` implementations in the
> next patch.
> 
> Cc: FUJITA Tomonori <fujita.tomonori@...il.com>
> Cc: Trevor Gross <tmgross@...ch.edu>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Wedson Almeida Filho <walmeida@...rosoft.com>
> ---
>  rust/kernel/net/phy.rs | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs
> index 96e09c6e8530..265d0e1c1371 100644
> --- a/rust/kernel/net/phy.rs
> +++ b/rust/kernel/net/phy.rs
> @@ -640,6 +640,10 @@ pub struct Registration {
>      drivers: Pin<&'static mut [DriverVTable]>,
>  }
>  
> +// SAFETY: The only action allowed in a `Registration` instance is dropping it, which is safe to do
> +// from any thread because `phy_drivers_unregister` can be called from any thread context.
> +unsafe impl Send for Registration {}
> +
>  impl Registration {
>      /// Registers a PHY driver.
>      pub fn register(

After the following discussion, I dropped Send for Registration:

https://lore.kernel.org/netdev/8f476b7c-4647-457b-ab45-d6a979da4e78@lunn.ch/T/

If you guys think that Send can be added here, it's fine by me.


Once this In-place module series are merged, I'll revisit the phy
module initialization to remove `static mut DRIVERS`.