1 // SPDX-License-Identifier: GPL-2.0 2 3 //! Atomic primitives. 4 //! 5 //! These primitives have the same semantics as their C counterparts: and the precise definitions of 6 //! semantics can be found at [`LKMM`]. Note that Linux Kernel Memory (Consistency) Model is the 7 //! only model for Rust code in kernel, and Rust's own atomics should be avoided. 8 //! 9 //! # Data races 10 //! 11 //! [`LKMM`] atomics have different rules regarding data races: 12 //! 13 //! - A normal write from C side is treated as an atomic write if 14 //! CONFIG_KCSAN_ASSUME_PLAIN_WRITES_ATOMIC=y. 15 //! - Mixed-size atomic accesses don't cause data races. 16 //! 17 //! [`LKMM`]: srctree/tools/memory-model/ 18 19 #[allow(dead_code, unreachable_pub)] 20 mod internal; 21 pub mod ordering; 22 23 pub use internal::AtomicImpl; 24 pub use ordering::{Acquire, Full, Relaxed, Release}; 25