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kernel/linux-rt-4.4.41/tools/arch/mips/include/asm/barrier.h 690 Bytes
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  #ifndef _TOOLS_LINUX_ASM_MIPS_BARRIER_H
  #define _TOOLS_LINUX_ASM_MIPS_BARRIER_H
  /*
   * FIXME: This came from tools/perf/perf-sys.h, where it was first introduced
   * in c1e028ef40b8d6943b767028ba17d4f2ba020edb, more work needed to make it
   * more closely follow the Linux kernel arch/mips/include/asm/barrier.h file.
   * Probably when we continue work on tools/ Kconfig support to have all the
   * CONFIG_ needed for properly doing that.
   */
  #define mb()		asm volatile(					\
  				".set	mips2
  \t"			\
  				"sync
  \t"				\
  				".set	mips0"				\
  				: /* no output */			\
  				: /* no input */			\
  				: "memory")
  #define wmb()	mb()
  #define rmb()	mb()
  
  #endif /* _TOOLS_LINUX_ASM_MIPS_BARRIER_H */