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See also: https://bugs.freedesktop.org/show_bug.cgi?id=86997
diff -ru spice-protocol-0.12.7/spice/barrier.h spice-0.12.5/spice-common/spice-protocol/spice/barrier.h
--- spice-protocol-0.12.7/spice/barrier.h 2013-12-10 20:42:54.000000000 -0200
+++ spice-protocol-0.12.7/spice/barrier.h 2014-12-04 13:45:54.593329844 -0200
@@ -34,12 +34,7 @@
#ifdef __GNUC__
-#ifdef __i386__
-#define spice_mb() __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory")
-#else
-//mfence
-#define spice_mb() __asm__ __volatile__ ("lock; addl $0,0(%%rsp)": : :"memory")
-#endif
+#define spice_mb() __sync_synchronize()
#else
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