linux-kernel - [PATCH] rust: kernel: cpu: mark `CpuId::current()` inline

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Message-ID: <20250811012000.444173-1-ritvikfoss@gmail.com>
Date: Mon, 11 Aug 2025 06:49:58 +0530
From: Ritvik Gupta <ritvikfoss@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.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 <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>
Cc: skhan@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH] rust: kernel: cpu: mark `CpuId::current()` inline

When building the kernel using llvm-20.1.7-rust-1.89.0-x86_64,
this symbol is generated:

$ llvm-nm --demangle vmlinux | grep CpuId
ffffffff84c77450 T <kernel::cpu::CpuId>::current

However, this Rust symbol is a trivial wrapper around
`raw_smp_processor_id` function. It doesn't make sense
to go through a trivial wrapper for such functions,
so mark it inline.

After applying this patch, the above command will produce no output.

Suggested-by: Alice Ryhl <aliceryhl@...gle.com>
Link: https://github.com/Rust-for-Linux/linux/issues/1145
Signed-off-by: Ritvik Gupta <ritvikfoss@...il.com>
---
 rust/kernel/cpu.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rust/kernel/cpu.rs b/rust/kernel/cpu.rs
index 5de730c8d817..cb6c0338ef5a 100644
--- a/rust/kernel/cpu.rs
+++ b/rust/kernel/cpu.rs
@@ -109,6 +109,7 @@ pub fn as_u32(&self) -> u32 {
     /// unexpectedly due to preemption or CPU migration. It should only be
     /// used when the context ensures that the task remains on the same CPU
     /// or the users could use a stale (yet valid) CPU ID.
+    #[inline]
     pub fn current() -> Self {
         // SAFETY: raw_smp_processor_id() always returns a valid CPU ID.
         unsafe { Self::from_u32_unchecked(bindings::raw_smp_processor_id()) }

base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
-- 
2.50.1