vmstat: remove prefetch

Remove the prefetch logic in order to avoid touching impossible per cpu
areas.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Mike Travis <travis@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 9 deletions

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 888668e0b7db..422d960ffcd8 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -21,21 +21,14 @@ EXPORT_PER_CPU_SYMBOL(vm_event_states);
 
 static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask)
 {
-        int cpu = 0;
+        int cpu;
         int i;
 
         memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long));
 
-        cpu = first_cpu(*cpumask);
-        while (cpu < NR_CPUS) {
+        for_each_cpu_mask(cpu, *cpumask) {
                 struct vm_event_state *this = &per_cpu(vm_event_states, cpu);
 
-                cpu = next_cpu(cpu, *cpumask);
-
-                if (cpu < NR_CPUS)
-                        prefetch(&per_cpu(vm_event_states, cpu));
-
-
                 for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
                         ret[i] += this->event[i];
         }