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authorChristoph Lameter <cl@linux-foundation.org>2009-10-03 19:48:23 +0900
committerTejun Heo <tj@kernel.org>2009-10-03 19:48:23 +0900
commite7dcaa4755e35d7540bf19f316f8798357c53fa0 (patch)
tree69c41151378213382199b577f2bc7b0d8bd1cc22 /drivers/net/veth.c
parentca0c9584b1f16bd5911893647cb7f1be82e60554 (diff)
downloadop-kernel-dev-e7dcaa4755e35d7540bf19f316f8798357c53fa0.zip
op-kernel-dev-e7dcaa4755e35d7540bf19f316f8798357c53fa0.tar.gz
this_cpu: Eliminate get/put_cpu
There are cases where we can use this_cpu_ptr and as the result of using this_cpu_ptr() we no longer need to determine the currently executing cpu. In those places no get/put_cpu combination is needed anymore. The local cpu variable can be eliminated. Preemption still needs to be disabled and enabled since the modifications of the per cpu variables is not atomic. There may be multiple per cpu variables modified and those must all be from the same processor. Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Acked-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Tejun Heo <tj@kernel.org> cc: Eric Biederman <ebiederm@aristanetworks.com> cc: Stephen Hemminger <shemminger@vyatta.com> cc: David L Stevens <dlstevens@us.ibm.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/net/veth.c')
-rw-r--r--drivers/net/veth.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index ade5b34..0c4a811 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -153,7 +153,7 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
struct net_device *rcv = NULL;
struct veth_priv *priv, *rcv_priv;
struct veth_net_stats *stats, *rcv_stats;
- int length, cpu;
+ int length;
skb_orphan(skb);
@@ -161,9 +161,8 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
rcv = priv->peer;
rcv_priv = netdev_priv(rcv);
- cpu = smp_processor_id();
- stats = per_cpu_ptr(priv->stats, cpu);
- rcv_stats = per_cpu_ptr(rcv_priv->stats, cpu);
+ stats = this_cpu_ptr(priv->stats);
+ rcv_stats = this_cpu_ptr(rcv_priv->stats);
if (!(rcv->flags & IFF_UP))
goto tx_drop;
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