[PATCH] ia64: Update function prototype for sn_io_addr

Add "const" to function prototype for sn_io_addr. Cuts boot time
on simulator in half.
Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: David Mosberger <davidm@hpl.hp.com>

include/asm-ia64/sn/sn2/io.h

@@ -8,10 +8,11 @@
 
 #ifndef _ASM_SN_SN2_IO_H
 #define _ASM_SN_SN2_IO_H
+#include <linux/compiler.h>
+#include <asm/intrinsics.h>
 
-extern void * sn_io_addr(unsigned long port); /* Forward definition */
+extern void * sn_io_addr(unsigned long port) __attribute_const__; /* Forward definition */
 extern void sn_mmiob(void); /* Forward definition */
-#include <asm/intrinsics.h>
 
 #define __sn_mf_a()   ia64_mfa()