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-rw-r--r--arch/um/sys-i386/shared/sysdep/barrier.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/um/sys-i386/shared/sysdep/barrier.h b/arch/um/sys-i386/shared/sysdep/barrier.h
new file mode 100644
index 000000000000..b58d52c5b2f4
--- /dev/null
+++ b/arch/um/sys-i386/shared/sysdep/barrier.h
@@ -0,0 +1,9 @@
1#ifndef __SYSDEP_I386_BARRIER_H
2#define __SYSDEP_I386_BARRIER_H
3
4/* Copied from include/asm-i386 for use by userspace. i386 has the option
5 * of using mfence, but I'm just using this, which works everywhere, for now.
6 */
7#define mb() asm volatile("lock; addl $0,0(%esp)")
8
9#endif