From: Alexandre Courbot <acourbot@nvidia.com>
To: "Danilo Krummrich" <dakr@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Daniel Almeida" <daniel.almeida@collabora.com>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Trevor Gross" <tmgross@umich.edu>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Viresh Kumar" <viresh.kumar@linaro.org>,
"Will Deacon" <will@kernel.org>,
"Peter Zijlstra" <peterz@infradead.org>,
"Mark Rutland" <mark.rutland@arm.com>
Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org,
Alexandre Courbot <acourbot@nvidia.com>
Subject: [PATCH v2 3/7] rust: cpufreq: always inline functions using build_assert with arguments
Date: Fri, 28 Nov 2025 11:11:39 +0900 [thread overview]
Message-ID: <20251128-io-build-assert-v2-3-a9ea9ce7d45d@nvidia.com> (raw)
In-Reply-To: <20251128-io-build-assert-v2-0-a9ea9ce7d45d@nvidia.com>
`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>
---
rust/kernel/cpufreq.rs | 2 ++
1 file changed, 2 insertions(+)
diff --git a/rust/kernel/cpufreq.rs b/rust/kernel/cpufreq.rs
index 1a555fcb120a..df5d9f6f43f3 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
next prev parent reply other threads:[~2025-11-28 2:12 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-28 2:11 [PATCH v2 0/7] rust: build_assert: document and fix use with function arguments Alexandre Courbot
2025-11-28 2:11 ` [PATCH v2 1/7] rust: build_assert: add instructions for " Alexandre Courbot
2025-11-30 21:44 ` John Hubbard
2025-11-30 21:56 ` Miguel Ojeda
2025-11-30 22:00 ` John Hubbard
2025-11-30 22:42 ` Miguel Ojeda
2025-12-01 0:52 ` John Hubbard
2025-12-01 3:44 ` Miguel Ojeda
2025-12-01 4:36 ` John Hubbard
2025-12-01 16:43 ` Miguel Ojeda
2025-12-01 19:31 ` John Hubbard
2025-12-01 23:06 ` Miguel Ojeda
2025-12-02 1:38 ` John Hubbard
2025-12-01 19:53 ` Edwin Peer
2025-12-03 3:18 ` Alexandre Courbot
2025-11-28 2:11 ` [PATCH v2 2/7] rust: io: always inline functions using build_assert with arguments Alexandre Courbot
2025-12-01 20:06 ` Edwin Peer
2025-12-02 10:14 ` Alice Ryhl
2025-11-28 2:11 ` Alexandre Courbot [this message]
2025-11-28 6:12 ` [PATCH v2 3/7] rust: cpufreq: " Viresh Kumar
2025-11-28 9:32 ` Alice Ryhl
2025-11-28 9:55 ` Viresh Kumar
2025-11-28 2:11 ` [PATCH v2 4/7] rust: bits: " Alexandre Courbot
2025-11-28 2:11 ` [PATCH v2 5/7] rust: sync: refcount: " Alexandre Courbot
2025-11-28 2:11 ` [PATCH v2 6/7] rust: irq: " Alexandre Courbot
2025-11-28 2:11 ` [PATCH v2 7/7] rust: num: bounded: add missing comment for always inlined function Alexandre Courbot
2025-11-28 14:02 ` [PATCH v2 0/7] rust: build_assert: document and fix use with function arguments Daniel Almeida
2025-11-30 16:09 ` Daniel Almeida
2025-11-30 17:48 ` Miguel Ojeda
2025-12-03 3:19 ` Alexandre Courbot
2025-12-03 18:37 ` Miguel Ojeda
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