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x86, um: trim the junk from uml ptrace-*.h
[mirror_ubuntu-bionic-kernel.git] / arch / um / include / shared / sysdep-x86_64 / barrier.h
1 #ifndef __SYSDEP_X86_64_BARRIER_H
2 #define __SYSDEP_X86_64_BARRIER_H
3
4 /* Copied from include/asm-x86_64 for use by userspace. */
5 #define mb() asm volatile("mfence":::"memory")
6
7 #endif
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