linux-kernel - [PATCH v3 3/7] rust: cpufreq: always inline functions using build

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Message-Id: <20251208-io-build-assert-v3-3-98aded02c1ea@nvidia.com>
Date: Mon, 08 Dec 2025 11:47:01 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Daniel Almeida <daniel.almeida@...labora.com>, 
 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>, 
 Trevor Gross <tmgross@...ch.edu>, "Rafael J. Wysocki" <rafael@...nel.org>, 
 Viresh Kumar <viresh.kumar@...aro.org>, Will Deacon <will@...nel.org>, 
 Peter Zijlstra <peterz@...radead.org>, Mark Rutland <mark.rutland@....com>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-pm@...r.kernel.org, Alexandre Courbot <acourbot@...dia.com>, 
 stable@...r.kernel.org
Subject: [PATCH v3 3/7] rust: cpufreq: always inline functions using
 build_assert with arguments

`build_assert` relies on the compiler to optimize out its error path.
Functions using it with its arguments must thus always be inlined,
otherwise the error path of `build_assert` might not be optimized out,
triggering a build error.

Cc: stable@...r.kernel.org
Fixes: c6af9a1191d0 ("rust: cpufreq: Extend abstractions for driver registration")
Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
Reviewed-by: Daniel Almeida <daniel.almeida@...labora.com>
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 rust/kernel/cpufreq.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rust/kernel/cpufreq.rs b/rust/kernel/cpufreq.rs
index f968fbd22890..0879a79485f8 100644
--- a/rust/kernel/cpufreq.rs
+++ b/rust/kernel/cpufreq.rs
@@ -1015,6 +1015,8 @@ impl<T: Driver> Registration<T> {
         ..pin_init::zeroed()
     };

+    // Always inline to optimize out error path of `build_assert`.
+    #[inline(always)]
     const fn copy_name(name: &'static CStr) -> [c_char; CPUFREQ_NAME_LEN] {
         let src = name.to_bytes_with_nul();
         let mut dst = [0; CPUFREQ_NAME_LEN];

-- 
2.52.0