[NET]: Wider use of for_each_*cpu()

In 'net' change the explicit use of for-loops and NR_CPUS into the
general for_each_cpu() or for_each_online_cpu() constructs, as
appropriate.  This widens the scope of potential future optimizations
of the general constructs, as well as takes advantage of the existing
optimizations of first_cpu() and next_cpu(), which is advantageous
when the true CPU count is much smaller than NR_CPUS.

Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 5f043d3..00116d8 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3065,12 +3065,9 @@
 	/* Register us to receive netdevice events */
 	register_netdevice_notifier(&pktgen_notifier_block);
         
-	for (cpu = 0; cpu < NR_CPUS ; cpu++) {
+	for_each_online_cpu(cpu) {
 		char buf[30];
 
-		if (!cpu_online(cpu))
-			continue;
-
                 sprintf(buf, "kpktgend_%i", cpu);
                 pktgen_create_thread(buf, cpu);
         }