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Diffstat (limited to 'tools/virtio/ringtest/main.h')
| -rw-r--r-- | tools/virtio/ringtest/main.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/virtio/ringtest/main.h b/tools/virtio/ringtest/main.h index 90b0133004e1..5706e075adf2 100644 --- a/tools/virtio/ringtest/main.h +++ b/tools/virtio/ringtest/main.h @@ -110,11 +110,15 @@ static inline void busy_wait(void) barrier(); } +#if defined(__x86_64__) || defined(__i386__) +#define smp_mb() asm volatile("lock; addl $0,-128(%%rsp)" ::: "memory", "cc") +#else /* * Not using __ATOMIC_SEQ_CST since gcc docs say they are only synchronized * with other __ATOMIC_SEQ_CST calls. */ #define smp_mb() __sync_synchronize() +#endif /* * This abuses the atomic builtins for thread fences, and |