[PATCH] percpu data: only iterate over possible CPUs

percpu_data blindly allocates bootmem memory to store NR_CPUS instances of
cpudata, instead of allocating memory only for possible cpus.

As a preparation for changing that, we need to convert various 0 -> NR_CPUS
loops to use for_each_cpu().

(The above only applies to users of asm-generic/percpu.h.  powerpc has gone it
alone and is presently only allocating memory for present CPUs, so it's
currently corrupting memory).

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Jens Axboe <axboe@suse.de>
Cc: Anton Blanchard <anton@samba.org>
Acked-by: William Irwin <wli@holomorphy.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 3 insertions, 3 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index ffb82073056e..2afb0de95329 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3237,7 +3237,7 @@ static int __init net_dev_init(void)
          *      Initialise the packet receive queues.
          */
 
-        for (i = 0; i < NR_CPUS; i++) {
+        for_each_cpu(i) {
                 struct softnet_data *queue;
 
                 queue = &per_cpu(softnet_data, i);
diff --git a/net/core/utils.c b/net/core/utils.c
index ac1d1fcf8673..fdc4f38bc46c 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -121,7 +121,7 @@ void __init net_random_init(void)
 {
         int i;
 
-        for (i = 0; i < NR_CPUS; i++) {
+        for_each_cpu(i) {
                 struct nrnd_state *state = &per_cpu(net_rand_state,i);
                 __net_srandom(state, i+jiffies);
         }
@@ -133,7 +133,7 @@ static int net_random_reseed(void)
         unsigned long seed[NR_CPUS];
 
         get_random_bytes(seed, sizeof(seed));
-        for (i = 0; i < NR_CPUS; i++) {
+        for_each_cpu(i) {
                 struct nrnd_state *state = &per_cpu(net_rand_state,i);
                 __net_srandom(state, seed[i]);
         }