From: Alexandre Courbot <acourbot@nvidia.com>
Date: Mon, 8 Dec 2025 02:47:03 +0000 (+0900)
Subject: rust: sync: refcount: always inline functions using build_assert with arguments
X-Git-Tag: v6.19-rc8~13^2~7
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d6ff6e870077ae0f01a6f860ca1e4a5a825dc032;p=thirdparty%2Fkernel%2Flinux.git

rust: sync: refcount: 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@vger.kernel.org
Fixes: bb38f35b35f9 ("rust: implement `kernel::sync::Refcount`")
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251208-io-build-assert-v3-5-98aded02c1ea@nvidia.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---

diff --git a/rust/kernel/sync/refcount.rs b/rust/kernel/sync/refcount.rs
index 19236a5bccde..6c7ae8b05a0b 100644
--- a/rust/kernel/sync/refcount.rs
+++ b/rust/kernel/sync/refcount.rs
@@ -23,7 +23,8 @@ impl Refcount {
     /// Construct a new [`Refcount`] from an initial value.
     ///
     /// The initial value should be non-saturated.
-    #[inline]
+    // Always inline to optimize out error path of `build_assert`.
+    #[inline(always)]
     pub fn new(value: i32) -> Self {
         build_assert!(value >= 0, "initial value saturated");
         // SAFETY: There are no safety requirements for this FFI call.