diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 4d31688b22b3..2d22f1fcd8e2 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -12,7 +12,6 @@
 #include "as-layout.h"
 #include "kern_util.h"
 #include "os.h"
-#include "sysdep/barrier.h"
 #include "sysdep/mcontext.h"
 
 void (*sig_info[NSIG])(int, struct uml_pt_regs *) = {
diff --git a/arch/um/sys-x86/shared/sysdep/barrier.h b/arch/um/sys-x86/shared/sysdep/barrier.h
deleted file mode 100644
index 89ee23bc8da4..000000000000
--- a/arch/um/sys-x86/shared/sysdep/barrier.h
+++ /dev/null
@@ -1,5 +0,0 @@
-#ifdef __i386__
-#include "barrier_32.h"
-#else
-#include "barrier_64.h"
-#endif
diff --git a/arch/um/sys-x86/shared/sysdep/barrier_32.h b/arch/um/sys-x86/shared/sysdep/barrier_32.h
deleted file mode 100644
index b58d52c5b2f4..000000000000
--- a/arch/um/sys-x86/shared/sysdep/barrier_32.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#ifndef __SYSDEP_I386_BARRIER_H
-#define __SYSDEP_I386_BARRIER_H
-
-/* Copied from include/asm-i386 for use by userspace.  i386 has the option
- * of using mfence, but I'm just using this, which works everywhere, for now.
- */
-#define mb() asm volatile("lock; addl $0,0(%esp)")
-
-#endif
diff --git a/arch/um/sys-x86/shared/sysdep/barrier_64.h b/arch/um/sys-x86/shared/sysdep/barrier_64.h
deleted file mode 100644
index 7b610befdc8f..000000000000
--- a/arch/um/sys-x86/shared/sysdep/barrier_64.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#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