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syslet: add proper read barrier between user_tail and completion read
[fio.git]
/
arch
/
arch-x86_64.h
diff --git
a/arch/arch-x86_64.h
b/arch/arch-x86_64.h
index 4f75addc1be14fd35d46e9631a57b50978bb6023..979c3206185f87334488d60179ff9918e13642cf 100644
(file)
--- a/
arch/arch-x86_64.h
+++ b/
arch/arch-x86_64.h
@@
-29,7
+29,8
@@
#define FIO_HAVE_SYSLET
#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)
{
static inline unsigned long fio_ffz(unsigned long bitmask)
{