Add write barriers

[fio.git] / arch / arch-x86_64.h

diff --git a/arch/arch-x86_64.h b/arch/arch-x86_64.h
index 4f75addc1be14fd35d46e9631a57b50978bb6023..216e74e2e32a409d1d7bbee30aa38f771cafdb40 100644 (file)
--- a/arch/arch-x86_64.h
+++ b/arch/arch-x86_64.h
@@ -29,13 +29,15 @@
 
 #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")
+#define write_barrier()        __asm__ __volatile__("sfence":::"memory")
 
-static inline unsigned long fio_ffz(unsigned long bitmask)
+static inline unsigned int arch_ffz(unsigned int bitmask)
 {
-       __asm__("bsfq %1,%0" :"=r" (bitmask) :"r" (~bitmask));
+       __asm__("bsfl %1,%0" :"=r" (bitmask) :"r" (~bitmask));
        return bitmask;
 }
-
+#define ARCH_HAVE_FFZ
 
 #endif