vmstat: remove prefetch

Remove the prefetch logic in order to avoid touching impossible per cpu areas. Signed-off-by: Christoph Lameter <[email protected]> Cc: Mike Travis <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
RyanHsu · Feb 5, 2008 · 9eccf2a · 9eccf2a
1 parent 7766755
commit 9eccf2a
Showing 1 changed file with 2 additions and 9 deletions.
diff --git 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];
 	}