linux-stable-rt/arch/um/include/sysdep-x86_64/barrier.h

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C

#ifndef __SYSDEP_X86_64_BARRIER_H
#define __SYSDEP_X86_64_BARRIER_H
/* Copied from include/asm-x86_64 for use by userspace. */
#define mb() asm volatile("mfence":::"memory")
#endif