linux-kernel - [PATCH] rust/kernel/faux: mark Registration methods inline

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Message-Id: <20250309-faux-inline-v1-1-c1b692862433@ethancedwards.com>
Date: Sun, 09 Mar 2025 22:14:36 -0400
From: Ethan Carter Edwards <ethan@...ancedwards.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>, 
 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>, 
 Trevor Gross <tmgross@...ch.edu>, Nathan Chancellor <nathan@...nel.org>, 
 Nick Desaulniers <nick.desaulniers+lkml@...il.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 llvm@...ts.linux.dev, Ethan Carter Edwards <ethan@...ancedwards.com>
Subject: [PATCH] rust/kernel/faux: mark Registration methods inline

When building the kernel on Arch Linux using on x86_64 with tools:
$ rustc --version
rustc 1.84.0 (9fc6b4312 2025-01-07)
$ cargo --version
cargo 1.84.0 (66221abde 2024-11-19)
$ clang --version
clang version 19.1.7
Target: x86_64-pc-linux-gnu

The following symbols are generated:
$ nm vmlinux | rg ' _R' | rustfilt | rg faux
ffffffff81959ae0 T <kernel::faux::Registration>::new
ffffffff81959b40 T <kernel::faux::Registration as core::ops::drop::Drop>::drop

However, these Rust symbols are wrappers around bindings in the C faux
code. Inlining these functions removes the middle-man wrapper function
After applying this patch, the above function signatures disappear.

Link: https://github.com/Rust-for-Linux/linux/issues/1145
Signed-off-by: Ethan Carter Edwards <ethan@...ancedwards.com>
---
 rust/kernel/faux.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rust/kernel/faux.rs b/rust/kernel/faux.rs
index 5acc0c02d451f6d5a26b837d509374d508f26368..5fdd85ea64398130066d38e42f7c7485673f290c 100644
--- a/rust/kernel/faux.rs
+++ b/rust/kernel/faux.rs
@@ -24,6 +24,7 @@

 impl Registration {
     /// Create and register a new faux device with the given name.
+    #[inline]
     pub fn new(name: &CStr) -> Result<Self> {
         // SAFETY:
         // - `name` is copied by this function into its own storage
@@ -50,6 +51,7 @@ fn as_ref(&self) -> &device::Device {
 }

 impl Drop for Registration {
+    #[inline]
     fn drop(&mut self) {
         // SAFETY: `self.0` is a valid registered faux_device via our type invariants.
         unsafe { bindings::faux_device_destroy(self.as_raw()) }

---
base-commit: fc2f191f850d9a2fb1b78c51d49076e60fb42c49
change-id: 20250309-faux-inline-6c8eead1bcd0

Best regards,
-- 
Ethan Carter Edwards <ethan@...ancedwards.com>