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acrn-kernel/arch/um/sys-x86_64/shared/sysdep/barrier.h

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#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
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