x86: make clear_fixmap() available on 64-bit as well

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/fixmap.h b/include/asm-x86/fixmap.h
index 382eb27..5bd2069 100644
--- a/include/asm-x86/fixmap.h
+++ b/include/asm-x86/fixmap.h
@@ -1,5 +1,13 @@
+#ifndef _ASM_FIXMAP_H
+#define _ASM_FIXMAP_H
+
 #ifdef CONFIG_X86_32
 # include "fixmap_32.h"
 #else
 # include "fixmap_64.h"
 #endif
+
+#define clear_fixmap(idx)			\
+	__set_fixmap(idx, 0, __pgprot(0))
+
+#endif