[PATCH] count_vm_events() fix

Dopey bug.  Causes hopelessly-wrong numbers from vmstat(8) and several other
counters.

Cc: Christoph Lameter <clameter@engr.sgi.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

include/linux/vmstat.h

@@ -57,7 +57,7 @@ static inline void __count_vm_events(enum vm_event_item item, long delta)
 
 static inline void count_vm_events(enum vm_event_item item, long delta)
 {
-	get_cpu_var(vm_event_states.event[item])++;
+	get_cpu_var(vm_event_states.event[item]) += delta;
 	put_cpu();
 }