From 491847f3b29cef0417a03142b96e2a6dea81cca0 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Fri, 26 Jan 2018 01:36:44 +0200 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- tools/virtio/ringtest/main.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/virtio/ringtest/main.h b/tools/virtio/ringtest/main.h index 593a328..301d59b 100644 --- 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 -- 2.7.4