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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162// SPDX-License-Identifier: GPL-2.0
//! Memory barriers.//!//! These primitives have the same semantics as their C counterparts: and the precise definitions//! of semantics can be found at [`LKMM`].//!//! [`LKMM`]: srctree/tools/memory-model/
/// A compiler barrier.////// A barrier that prevents compiler from reordering memory accesses across the barrier.#[inline(always)]pub(crate) fn barrier() { // By default, Rust inline asms are treated as being able to access any memory or flags, hence // it suffices as a compiler barrier. // // SAFETY: An empty asm block. unsafe { core::arch::asm!("") };}
/// A full memory barrier.////// A barrier that prevents compiler and CPU from reordering memory accesses across the barrier.#[inline(always)]pub fn smp_mb() { if cfg!(CONFIG_SMP) { // SAFETY: `smp_mb()` is safe to call. unsafe { bindings::smp_mb() }; } else { barrier(); }}
/// A write-write memory barrier.////// A barrier that prevents compiler and CPU from reordering memory write accesses across the/// barrier.#[inline(always)]pub fn smp_wmb() { if cfg!(CONFIG_SMP) { // SAFETY: `smp_wmb()` is safe to call. unsafe { bindings::smp_wmb() }; } else { barrier(); }}
/// A read-read memory barrier.////// A barrier that prevents compiler and CPU from reordering memory read accesses across the/// barrier.#[inline(always)]pub fn smp_rmb() { if cfg!(CONFIG_SMP) { // SAFETY: `smp_rmb()` is safe to call. unsafe { bindings::smp_rmb() }; } else { barrier(); }}