netdev - Re: [PATCH net-next v6 3/5] rust: add second `bindgen` pass for enum exhaustiveness checking

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Date: Wed, 25 Oct 2023 10:33:33 +0900 (JST)
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: benno.lossin@...ton.me
Cc: fujita.tomonori@...il.com, netdev@...r.kernel.org,
 rust-for-linux@...r.kernel.org, andrew@...n.ch, tmgross@...ch.edu,
 miguel.ojeda.sandonis@...il.com, wedsonaf@...il.com, greg@...ah.com,
 ojeda@...nel.org
Subject: Re: [PATCH net-next v6 3/5] rust: add second `bindgen` pass for
 enum exhaustiveness checking

On Tue, 24 Oct 2023 16:29:16 +0000
Benno Lossin <benno.lossin@...ton.me> wrote:

> On 24.10.23 02:58, FUJITA Tomonori wrote:
>> From: Miguel Ojeda <ojeda@...nel.org>
> 
> I think this commit message should also explain what it is
> doing and not only the error below.

Looks ok?

This patch makes sure that the C's enum phy_state is sync with Rust
sides. If not, compiling fails. Note that this is a temporary
solution. It will be replaced with bindgen when it supports generating
the enum conversion code.

    error[E0005]: refutable pattern in function argument
         --> rust/bindings/bindings_enum_check.rs:29:6
          |
    29    |       (phy_state::PHY_DOWN
          |  ______^
    30    | |     | phy_state::PHY_READY
    31    | |     | phy_state::PHY_HALTED
    32    | |     | phy_state::PHY_ERROR
    ...     |
    35    | |     | phy_state::PHY_NOLINK
    36    | |     | phy_state::PHY_CABLETEST): phy_state,
          | |______________________________^ pattern `phy_state::PHY_NEW` not covered
          |
    note: `phy_state` defined here
         --> rust/bindings/bindings_generated_enum_check.rs:60739:10
          |
    60739 | pub enum phy_state {
          |          ^^^^^^^^^
    ...
    60745 |     PHY_NEW = 5,
          |     ------- not covered
          = note: the matched value is of type `phy_state`