net: introduce netdev_alloc_pcpu_stats() for drivers

There are many drivers calling alloc_percpu() to allocate pcpu stats
and then initializing ->syncp. So just introduce a helper function for them.

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 9 deletions

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index de51c48c4393..566adbf5c506 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -556,7 +556,7 @@ static const struct net_device_ops vlan_netdev_ops;
 static int vlan_dev_init(struct net_device *dev)
 {
         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
-        int subclass = 0, i;
+        int subclass = 0;
 
         netif_carrier_off(dev);
 
@@ -606,17 +606,10 @@ static int vlan_dev_init(struct net_device *dev)
 
         vlan_dev_set_lockdep_class(dev, subclass);
 
-        vlan_dev_priv(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
+        vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
                 return -ENOMEM;
 
-        for_each_possible_cpu(i) {
-                struct vlan_pcpu_stats *vlan_stat;
-                vlan_stat = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
-                u64_stats_init(&vlan_stat->syncp);
-        }
-
-
         return 0;
 }