diff options
| author | FUJITA Tomonori <fujita.tomonori@gmail.com> | 2025-08-21 09:20:54 +0900 |
|---|---|---|
| committer | Danilo Krummrich <dakr@kernel.org> | 2025-08-21 16:58:07 +0200 |
| commit | 842aedc3907deb154eedb88c7e4c3278c9b33701 (patch) | |
| tree | b67620de5b6620ca04e5f76a16729efc6663e509 /rust/kernel/processor.rs | |
| parent | 44d454fcffa8b08d6d66df132121c1d387fa85db (diff) | |
rust: Add cpu_relax() helper
Add cpu_relax() helper in preparation for supporting
read_poll_timeout().
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Link: https://lore.kernel.org/r/20250821002055.3654160-2-fujita.tomonori@gmail.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Diffstat (limited to 'rust/kernel/processor.rs')
| -rw-r--r-- | rust/kernel/processor.rs | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/rust/kernel/processor.rs b/rust/kernel/processor.rs new file mode 100644 index 000000000000..85b49b3614dd --- /dev/null +++ b/rust/kernel/processor.rs @@ -0,0 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Processor related primitives. +//! +//! C header: [`include/linux/processor.h`](srctree/include/linux/processor.h) + +/// Lower CPU power consumption or yield to a hyperthreaded twin processor. +/// +/// It also happens to serve as a compiler barrier. +#[inline] +pub fn cpu_relax() { + // SAFETY: Always safe to call. + unsafe { bindings::cpu_relax() } +} |