diff options
| author | Alexandre Courbot <acourbot@nvidia.com> | 2025-12-08 11:47:02 +0900 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2026-01-18 20:40:11 +0100 |
| commit | 09c3c9112d71c44146419c87c55c710e68335741 (patch) | |
| tree | bb142a73b98f09050b4c6eb3253a77ffdc742a34 /rust/kernel | |
| parent | ac3c50b9a24e9ebeb585679078d6c47922034bb6 (diff) | |
rust: bits: 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: cc84ef3b88f4 ("rust: bits: add support for bits/genmask macros")
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://patch.msgid.link/20251208-io-build-assert-v3-4-98aded02c1ea@nvidia.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'rust/kernel')
| -rw-r--r-- | rust/kernel/bits.rs | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/rust/kernel/bits.rs b/rust/kernel/bits.rs index 553d50265883..2daead125626 100644 --- a/rust/kernel/bits.rs +++ b/rust/kernel/bits.rs @@ -27,7 +27,8 @@ macro_rules! impl_bit_fn { /// /// This version is the default and should be used if `n` is known at /// compile time. - #[inline] + // Always inline to optimize out error path of `build_assert`. + #[inline(always)] pub const fn [<bit_ $ty>](n: u32) -> $ty { build_assert!(n < <$ty>::BITS); (1 as $ty) << n @@ -75,7 +76,8 @@ macro_rules! impl_genmask_fn { /// This version is the default and should be used if the range is known /// at compile time. $(#[$genmask_ex])* - #[inline] + // Always inline to optimize out error path of `build_assert`. + #[inline(always)] pub const fn [<genmask_ $ty>](range: RangeInclusive<u32>) -> $ty { let start = *range.start(); let end = *range.end(); |