`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: 746680ec6696 ("rust: irq: add flags module")
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---
 rust/kernel/irq/flags.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rust/kernel/irq/flags.rs b/rust/kernel/irq/flags.rs
index adfde96ec47c..d26e25af06ee 100644
--- a/rust/kernel/irq/flags.rs
+++ b/rust/kernel/irq/flags.rs
@@ -96,6 +96,8 @@ pub(crate) fn into_inner(self) -> c_ulong {
         self.0
     }
 
+    // Always inline to optimize out error path of `build_assert`.
+    #[inline(always)]
     const fn new(value: u32) -> Self {
         build_assert!(value as u64 <= c_ulong::MAX as u64);
         Self(value as c_ulong)

-- 
2.52.0