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2025-08-21rust: Add cpu_relax() helperFUJITA Tomonori
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>