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tools/virtio: fix smp_mb on x86

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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]>
This commit is contained in:
Michael S. Tsirkin 2018-01-26 01:36:44 +02:00 • committed by David S. Miller
commit 491847f3b2
1 changed files with 1 additions and 1 deletions
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tools/virtio/ringtest/main.h
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@ -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