#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