openrisc: Export symbols needed by modules

This was detected by allmodconfig, errors reported:

 ERROR: "empty_zero_page" [net/ceph/libceph.ko] undefined!
 ERROR: "__ucmpdi2" [lib/842/842_decompress.ko] undefined!
 ERROR: "empty_zero_page" [fs/nfs/objlayout/objlayoutdriver.ko] undefined!
 ERROR: "empty_zero_page" [fs/exofs/exofs.ko] undefined!
 ERROR: "empty_zero_page" [fs/crypto/fscrypto.ko] undefined!
 ERROR: "__ucmpdi2" [fs/btrfs/btrfs.ko] undefined!
 ERROR: "pm_power_off" [drivers/regulator/act8865-regulator.ko] undefined!
 ERROR: "__ucmpdi2" [drivers/media/i2c/adv7842.ko] undefined!
 ERROR: "__clear_user" [drivers/md/dm-mod.ko] undefined!
 ERROR: "__clear_user" [net/netfilter/x_tables.ko] undefined!

Signed-off-by: Stafford Horne <shorne@gmail.com>

arch/openrisc/kernel/or32_ksyms.c

@@ -30,6 +30,7 @@
 #include <asm/hardirq.h>
 #include <asm/delay.h>
 #include <asm/pgalloc.h>
+#include <asm/pgtable.h>
 
 #define DECLARE_EXPORT(name) extern void name(void); EXPORT_SYMBOL(name)
 
@@ -42,6 +43,9 @@ DECLARE_EXPORT(__muldi3);
 DECLARE_EXPORT(__ashrdi3);
 DECLARE_EXPORT(__ashldi3);
 DECLARE_EXPORT(__lshrdi3);
+DECLARE_EXPORT(__ucmpdi2);
 
+EXPORT_SYMBOL(empty_zero_page);
 EXPORT_SYMBOL(__copy_tofrom_user);
+EXPORT_SYMBOL(__clear_user);
 EXPORT_SYMBOL(memset);

arch/openrisc/kernel/process.c

@@ -90,6 +90,7 @@ void arch_cpu_idle(void)
 }
 
 void (*pm_power_off) (void) = machine_power_off;
+EXPORT_SYMBOL(pm_power_off);
 
 /*
  * When a process does an "exec", machine state like FPU and debug