x86: move exports to actual definitions

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/x86/lib/cmpxchg8b_emu.S b/arch/x86/lib/cmpxchg8b_emu.S
index ad53497..03a186f 100644
--- a/arch/x86/lib/cmpxchg8b_emu.S
+++ b/arch/x86/lib/cmpxchg8b_emu.S
@@ -7,6 +7,7 @@
  */
 
 #include <linux/linkage.h>
+#include <asm/export.h>
 
 .text
 
@@ -48,3 +49,4 @@
 	ret
 
 ENDPROC(cmpxchg8b_emu)
+EXPORT_SYMBOL(cmpxchg8b_emu)