[NET]: NET_CLS_ROUTE : convert ip_rt_acct to per_cpu variables

ip_rt_acct needs 4096 bytes per cpu to perform some accounting.
It is actually allocated as a single huge array [4096*NR_CPUS]
(rounded up to a power of two)

Converting it to a per cpu variable is wanted to :
 - Save space on machines were num_possible_cpus() < NR_CPUS
 - Better NUMA placement (each cpu gets memory on its node)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 5b8a7603e606..4068e178d747 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -347,7 +347,7 @@ static int ip_rcv_finish(struct sk_buff *skb)
 
 #ifdef CONFIG_NET_CLS_ROUTE
         if (unlikely(skb->dst->tclassid)) {
-                struct ip_rt_acct *st = ip_rt_acct + 256*smp_processor_id();
+                struct ip_rt_acct *st = per_cpu_ptr(ip_rt_acct, smp_processor_id());
                 u32 idx = skb->dst->tclassid;
                 st[idx&0xFF].o_packets++;
                 st[idx&0xFF].o_bytes+=skb->len;