#define FIO_HAVE_SYSLET
-#define nop __asm__ __volatile__("rep;nop": : :"memory")
+#define nop __asm__ __volatile__("rep;nop": : :"memory")
+#define read_barrier() asm volatile("lfence":::"memory")
static inline unsigned long fio_ffz(unsigned long bitmask)
{