EXPORT_SYMBOL's in lib-y considered harmful:
<--  snip  -->
...
  MODPOST 1837 modules
ERROR: "__raw_readsl" [drivers/ssb/ssb.ko] undefined!
ERROR: "__raw_writesl" [drivers/ssb/ssb.ko] undefined!
ERROR: "__raw_writesl" [drivers/net/smc91x.ko] undefined!
ERROR: "__raw_readsl" [drivers/net/smc91x.ko] undefined!
ERROR: "__raw_writesl" [drivers/net/3c59x.ko] undefined!
ERROR: "__raw_readsl" [drivers/net/3c59x.ko] undefined!
...
make[2]: *** [__modpost] Error 1
<--  snip  -->
Reported-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
 # Makefile for SuperH-specific library files..
 #
 
-lib-y  = delay.o io.o memset.o memmove.o memchr.o \
+lib-y  = delay.o memset.o memmove.o memchr.o \
         checksum.o strlen.o div64.o div64-generic.o
 
+obj-y                          += io.o
+
 memcpy-y                       := memcpy.o
 memcpy-$(CONFIG_CPU_SH4)       := memcpy-sh4.o