[PATCH] sched: use for_each_cpu

The per cpu schedule counters need to be summed up over all possible cpus. 
When testing hotplug cpu remove I saw the sum of the online cpu count for
nr_uninterruptible go negative which made the load average go nuts.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/sched.c

@@ -1095,7 +1095,7 @@ unsigned long nr_uninterruptible(void)
 {
 	unsigned long i, sum = 0;
 
-	for_each_online_cpu(i)
+	for_each_cpu(i)
 		sum += cpu_rq(i)->nr_uninterruptible;
 
 	return sum;
@@ -1105,7 +1105,7 @@ unsigned long long nr_context_switches(void)
 {
 	unsigned long long i, sum = 0;
 
-	for_each_online_cpu(i)
+	for_each_cpu(i)
 		sum += cpu_rq(i)->nr_switches;
 
 	return sum;
@@ -1115,7 +1115,7 @@ unsigned long nr_iowait(void)
 {
 	unsigned long i, sum = 0;
 
-	for_each_online_cpu(i)
+	for_each_cpu(i)
 		sum += atomic_read(&cpu_rq(i)->nr_iowait);
 
 	return sum;