diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/qemu/sys_membarrier.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/qemu/sys_membarrier.h b/include/qemu/sys_membarrier.h index 9ce7f5210b..316e3dc4a2 100644 --- a/include/qemu/sys_membarrier.h +++ b/include/qemu/sys_membarrier.h @@ -9,9 +9,19 @@ #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 |