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Commit 491847f3 authored Jan 26, 2018 by Michael S. Tsirkin Committed by David S. Miller Jan 29, 2018

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 <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent b4eab7de

tools/virtio/ringtest/main.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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