From: Jens Axboe <axboe@kernel.dk>
Date: Wed, 16 Jan 2019 04:43:11 +0000 (-0700)
Subject: x86-64: correct read/write barriers
X-Git-Tag: fio-3.13~16
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=8287fee8a6f8ebb43081a3087d3a98bf6dc7f551;p=fio.git

x86-64: correct read/write barriers

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/arch/arch-x86_64.h b/arch/arch-x86_64.h
index 665c6b04..0cd21b8f 100644
--- a/arch/arch-x86_64.h
+++ b/arch/arch-x86_64.h
@@ -27,8 +27,8 @@ static inline void do_cpuid(unsigned int *eax, unsigned int *ebx,
 #define	FIO_HUGE_PAGE		2097152
 
 #define nop		__asm__ __volatile__("rep;nop": : :"memory")
-#define read_barrier()	__asm__ __volatile__("lfence":::"memory")
-#define write_barrier()	__asm__ __volatile__("sfence":::"memory")
+#define read_barrier()	__asm__ __volatile__("":::"memory")
+#define write_barrier()	__asm__ __volatile__("":::"memory")
 
 static inline unsigned long arch_ffz(unsigned long bitmask)
 {