netdev - [PATCH net] rust: net::phy scope ThisModule usage in the module_phy

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Message-ID: <20241113174438.327414-3-sergeantsagara@protonmail.com>
Date: Wed, 13 Nov 2024 17:45:22 +0000
From: Rahul Rameshbabu <sergeantsagara@...tonmail.com>
To: netdev@...r.kernel.org, rust-for-linux@...r.kernel.org
Cc: FUJITA Tomonori <fujita.tomonori@...il.com>, Trevor Gross <tmgross@...ch.edu>, Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Rahul Rameshbabu <sergeantsagara@...tonmail.com>
Subject: [PATCH net] rust: net::phy scope ThisModule usage in the module_phy_driver macro

Similar to the use of $crate::Module, ThisModule should be referred to as
$crate::ThisModule in the macro evaluation. The reason the macro previously
did not cause any errors is because all the users of the macro would use
kernel::prelude::*, bringing ThisModule into scope.

Fixes: 2fe11d5ab35d ("rust: net::phy add module_phy_driver macro")
Signed-off-by: Rahul Rameshbabu <sergeantsagara@...tonmail.com>
---

Notes:
    How I came up with this change:

    I was working on my own rust bindings and rust driver when I compared my
    macro_rule to the one used for module_phy_driver. I noticed, if I made a
    driver that does not use kernel::prelude::*, that the ThisModule type
    identifier used in the macro would cause an error without being scoped in
    the macro_rule. I believe the correct implementation for the macro is one
    where the types used are correctly expanded with needed scopes.

 rust/kernel/net/phy.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs
index 910ce867480a..80f9f571b88c 100644
--- a/rust/kernel/net/phy.rs
+++ b/rust/kernel/net/phy.rs
@@ -837,7 +837,7 @@ const fn as_int(&self) -> u32 {
 ///         [::kernel::net::phy::create_phy_driver::<PhySample>()];
 ///
 ///     impl ::kernel::Module for Module {
-///         fn init(module: &'static ThisModule) -> Result<Self> {
+///         fn init(module: &'static ::kernel::ThisModule) -> Result<Self> {
 ///             let drivers = unsafe { &mut DRIVERS };
 ///             let mut reg = ::kernel::net::phy::Registration::register(
 ///                 module,
@@ -899,7 +899,7 @@ struct Module {
                 [$($crate::net::phy::create_phy_driver::<$driver>()),+];

             impl $crate::Module for Module {
-                fn init(module: &'static ThisModule) -> Result<Self> {
+                fn init(module: &'static $crate::ThisModule) -> Result<Self> {
                     // SAFETY: The anonymous constant guarantees that nobody else can access
                     // the `DRIVERS` static. The array is used only in the C side.
                     let drivers = unsafe { &mut DRIVERS };

base-commit: 73af53d82076bbe184d9ece9e14b0dc8599e6055
-- 
2.44.1