[PATCH] vmstat: export all_vm_events()

Add missing EXPORT_SYMBOL for all_vm_events(). Git commit
f8891e5e1f caused this:

  Building modules, stage 2.
  MODPOST
WARNING: "all_vm_events" [arch/s390/appldata/appldata_mem.ko] undefined!
  CC      arch/s390/appldata/appldata_mem.mod.o

Cc: Christoph Lameter <christoph@lameter.com>
Cc: Gerald Schaefer <geraldsc@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/vmstat.c

@@ -81,6 +81,7 @@ void all_vm_events(unsigned long *ret)
 {
 	sum_vm_events(ret, &cpu_online_map);
 }
+EXPORT_SYMBOL_GPL(all_vm_events);
 
 #ifdef CONFIG_HOTPLUG
 /*