| /* |
| * Process-global memory barriers |
| * |
| * Copyright (c) 2018 Red Hat, Inc. |
| * |
| * Author: Paolo Bonzini <pbonzini@redhat.com> |
| */ |
| |
| #ifndef QEMU_SYS_MEMBARRIER_H |
| #define QEMU_SYS_MEMBARRIER_H 1 |
| |
| #ifdef CONFIG_MEMBARRIER |
| /* Only block reordering at the compiler level in the performance-critical |
| * side. The slow side forces processor-level ordering on all other cores |
| * through a system call. |
| */ |
| extern void smp_mb_global_init(void); |
| extern void smp_mb_global(void); |
| #define smp_mb_placeholder() barrier() |
| #else |
| /* Keep it simple, execute a real memory barrier on both sides. */ |
| static inline void smp_mb_global_init(void) {} |
| #define smp_mb_global() smp_mb() |
| #define smp_mb_placeholder() smp_mb() |
| #endif |
| |
| #endif |
