linux-kernel - [PATCH v4 02/13] rust: init: make `#[pin_data]` compatible with conditional compilation of fields

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Date:   Mon, 14 Aug 2023 08:46:31 +0000
From:   Benno Lossin <benno.lossin@...ton.me>
To:     Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>
Cc:     Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Andreas Hindborg <nmi@...aspace.dk>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev,
        Martin Rodriguez Reboredo <yakoyoku@...il.com>
Subject: [PATCH v4 02/13] rust: init: make `#[pin_data]` compatible with conditional compilation of fields

This patch allows one to write
```
#[pin_data]
pub struct Foo {
    #[cfg(CONFIG_BAR)]
    a: Bar,
    #[cfg(not(CONFIG_BAR))]
    a: Baz,
}
```
Before, this would result in a compile error, because `#[pin_data]`
would generate two functions named `a` for both fields unconditionally.

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>
Reviewed-by: Gary Guo <gary@...yguo.net>
Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
Signed-off-by: Benno Lossin <benno.lossin@...ton.me>
---
v3 -> v4:
- added Reviewed-by's from Gary, Alice and Martin.

 rust/kernel/init/macros.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rust/kernel/init/macros.rs b/rust/kernel/init/macros.rs
index fbaebd34f218..9182fdf99e7e 100644
--- a/rust/kernel/init/macros.rs
+++ b/rust/kernel/init/macros.rs
@@ -962,6 +962,7 @@ impl<$($impl_generics)*> $pin_data<$($ty_generics)*>
         where $($whr)*
         {
             $(
+                $(#[$($p_attr)*])*
                 $pvis unsafe fn $p_field<E>(
                     self,
                     slot: *mut $p_type,
@@ -971,6 +972,7 @@ impl<$($impl_generics)*> $pin_data<$($ty_generics)*>
                 }
             )*
             $(
+                $(#[$($attr)*])*
                 $fvis unsafe fn $field<E>(
                     self,
                     slot: *mut $type,
-- 
2.41.0