x86-64: ffz need only search the first 32-bits

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

diff --git a/arch/arch-x86_64.h b/arch/arch-x86_64.h
index fabdb9ad923db49458417994ef428b1bf3d9499e..a8f075a00a5656079f0a5107accad2eff34c0cd0 100644 (file)
--- a/arch/arch-x86_64.h
+++ b/arch/arch-x86_64.h
@@ -19,23 +19,24 @@
 #endif
 
 #ifndef __NR_async_exec
-#define __NR_async_exec                280
-#define __NR_async_wait                281
-#define __NR_umem_add          282
-#define __NR_async_thread      283
+#define __NR_async_exec                286
+#define __NR_async_wait                287
+#define __NR_umem_add          288
+#define __NR_async_thread      289
 #endif
 
 #define        FIO_HUGE_PAGE           2097152
 
 #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 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