From 842aedc3907deb154eedb88c7e4c3278c9b33701 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Thu, 21 Aug 2025 09:20:54 +0900 Subject: rust: Add cpu_relax() helper Add cpu_relax() helper in preparation for supporting read_poll_timeout(). Reviewed-by: Alice Ryhl Reviewed-by: Andreas Hindborg Reviewed-by: Daniel Almeida Acked-by: Miguel Ojeda Signed-off-by: FUJITA Tomonori Link: https://lore.kernel.org/r/20250821002055.3654160-2-fujita.tomonori@gmail.com Signed-off-by: Danilo Krummrich --- rust/kernel/processor.rs | 14 ++++++++++++++ 1 file changed, 14 insertions(+) create mode 100644 rust/kernel/processor.rs (limited to 'rust/kernel/processor.rs') 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() } +} -- cgit