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/*
* 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
#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
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