[PATCH 6.18 063/752] rust: cpufreq: always inline functions using build_assert with arguments

Sasha Levin
2026-02-28T17:49:01Z

From: Alexandre Courbot <acourbot@nvidia.com>

[ Upstream commit 8c8b12a55614ea05953e8d695e700e6e1322a05d ]

`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.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
rust/kernel/cpufreq.rs | 2 ++
1 file changed, 2 insertions(+)

diff --git a/rust/kernel/cpufreq.rs b/rust/kernel/cpufreq.rs
index 1a555fcb120a9..df5d9f6f43f3b 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];
--
2.51.0