[PATCH v3 3/7] rust: cpufreq: always inline functions using build_assert with arguments

Alexandre Courbot
2025-12-08T02:47:26Z

`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@vger.kernel.org
Fixes: c6af9a1191d0 ("rust: cpufreq: Extend abstractions for driver registration")
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.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