tools/virtio: fix smp_mb on x86

Offset 128 overlaps the last word of the redzone. Use 132 which is always beyond that. Signed-off-by: Michael S. Tsirkin <[email protected]> Signed-off-by: David S. Miller <[email protected]>
akeromi · Jan 29, 2018 · 491847f · 491847f
1 parent b4eab7d
commit 491847f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/tools/virtio/ringtest/main.h b/tools/virtio/ringtest/main.h
@@ -111,7 +111,7 @@ static inline void busy_wait(void)
 } 
 
 #if defined(__x86_64__) || defined(__i386__)
-#define smp_mb()     asm volatile("lock; addl $0,-128(%%rsp)" ::: "memory", "cc")
+#define smp_mb()     asm volatile("lock; addl $0,-132(%%rsp)" ::: "memory", "cc")
 #else
 /*
  * Not using __ATOMIC_SEQ_CST since gcc docs say they are only synchronized