linux-kernel - [PATCH v2] rust : Update the bios_limit_callback to use the C FFI types #1170

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Message-Id: <20250612104127.10299-1-abhinav.ogl@gmail.com>
Date: Thu, 12 Jun 2025 16:11:28 +0530
From: Abhinav Ananthu <abhinav.ogl@...il.com>
To: "Rafael J . Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>
Cc: 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>,
	linux-pm@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Abhinav Ananthu <abhinav.ogl@...il.com>
Subject: [PATCH v2] rust : Update the bios_limit_callback to use the C FFI types #1170

Update the `bios_limit_callback` function to use `c_int` and `c_uint` types,
which match the C ABI for the corresponding callback function. These types are
imported from the prelude.

This change ensures the Rust function signature exactly matches its expected
C counterpart, avoiding potential issues with type mismatches in the FFI
boundary.

Reported-by: Miguel Ojeda <ojeda@...nel.org>
Closes: https://lore.kernel.org/rust-for-linux/CANiq72=WpuGELzLbH-fxdOeJy9fiDFwatz6ynERDh=HP2z2MBw@mail.gmail.com/.
Signed-off-by: Abhinav Ananthu <abhinav.ogl@...il.com>
---

 rust/kernel/cpufreq.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/kernel/cpufreq.rs b/rust/kernel/cpufreq.rs
index b0a9c6182aec..e97607ed86c2 100644
--- a/rust/kernel/cpufreq.rs
+++ b/rust/kernel/cpufreq.rs
@@ -1277,7 +1277,7 @@ extern "C" fn update_limits_callback(ptr: *mut bindings::cpufreq_policy) {
     /// Driver's `bios_limit` callback.
     ///
     /// SAFETY: Called from C. Inputs must be valid pointers.
-    extern "C" fn bios_limit_callback(cpu: i32, limit: *mut u32) -> kernel::ffi::c_int {
+    extern "C" fn bios_limit_callback(cpu: c_int, limit: *mut c_uint) -> c_int {
         from_result(|| {
             let mut policy = PolicyCpu::from_cpu(cpu as u32)?;
 
-- 
2.34.1