[VLAN]: Avoid a 4-order allocation.

This patch splits the vlan_group struct into a multi-allocated struct. On
x86_64, the size of the original struct is a little more than 32KB, causing
a 4-order allocation, which is prune to problems caused by buddy-system
external fragmentation conditions.

I couldn't just use vmalloc() because vfree() cannot be called in the
softirq context of the RCU callback.

Signed-off-by: Dan Aloni <da-x@monatomic.org>
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 1f83988a6a64..02b61b85b62c 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -1132,8 +1132,7 @@ static void gfar_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
 
         spin_lock_irqsave(&priv->rxlock, flags);
 
-        if (priv->vlgrp)
-                priv->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(priv->vgrp, vid, NULL);
 
         spin_unlock_irqrestore(&priv->rxlock, flags);
 }