On Fri, Jan 26, 2018 at 11:56:14AM +0800, Jason Wang wrote:
>
>
> On 2018年01月26日 07:36, Michael S. Tsirkin wrote:
> > Offset 128 overlaps the last word of the redzone.
> > Use 132 which is always beyond that.
> >
> > Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> > ---
> > 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")
>
> Just wonder did "rsp" work for __i386__ ?
>
> Thanks
Oh you are right of course. Probably no one ever run this one on i386 :)
I'll add a patch on top as this is not a new bug.
> > +#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
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