#ifndef _MB_H

#define _MB_H

/* These definitions are not yet in distros, so I have cut and pasted just

   the needed definitions in here */

#ifdef __powerpc__

#define rmb() asm volatile ("sync" : : : "memory")

#elif defined (__s390__)

#define rmb() asm volatile("bcr 15,0" ::: "memory")

#elif defined (__sh__)

#if defined(__SH4A__) || defined(__SH5__)

#define rmb()          asm volatile("synco" ::: "memory")

#else

#define rmb()          asm volatile("" ::: "memory")

#endif

#elif defined (__hppa__)

#define rmb()           asm volatile("" ::: "memory")

#elif defined (__sparc__)

#define rmb()           asm volatile("":::"memory")

#elif defined (__alpha__)

#define rmb()           asm volatile("mb" ::: "memory")

#elif defined(__ia64__)

#define rmb()           asm volatile ("mf" ::: "memory")

#elif defined(__arm__)

/*

 * Use the __kuser_memory_barrier helper in the CPU helper page. See

 * arch/arm/kernel/entry-armv.S in the kernel source for details.

 */

#define rmb()           ((void(*)(void))0xffff0fa0)()

#elif defined(__aarch64__)

#define rmb()           asm volatile("dmb ld" ::: "memory")

#elif defined(__mips__)

#define rmb()           asm volatile(                                   \

                                ".set   mips2\n\t"                      \

                                "sync\n\t"                              \

                                ".set   mips0"                          \

				: /* no output */                       \

				: /* no input */                        \

				: "memory")

#elif defined(__i386__)

#define rmb() asm volatile("lock; addl $0,0(%%esp)" ::: "memory")

#elif defined(__x86_64)

#if defined(__KNC__)

#define rmb() __sync_synchronize()

#else

#define rmb() asm volatile("lfence":::"memory")

#endif

#else

#error Need to define rmb for this architecture!

#error See the kernel source directory: tools/perf/perf.h file

#endif

#endif