IPoIB: use kvzalloc to allocate an array of bucket pointers

This table by default takes 32KiB which is 3rd memory order. Meanwhile,
this memory is not aimed for DMA operation and could be safely allocated
by vmalloc.

Signed-off-by: Jan Dakinevich <jan.dakinevich@virtuozzo.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/ulp/ipoib/ipoib_main.c

@@ -1530,7 +1530,7 @@ static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
 		return -ENOMEM;
 	set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
 	size = roundup_pow_of_two(arp_tbl.gc_thresh3);
-	buckets = kcalloc(size, sizeof(*buckets), GFP_KERNEL);
+	buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL);
 	if (!buckets) {
 		kfree(htbl);
 		return -ENOMEM;
@@ -1558,7 +1558,7 @@ static void neigh_hash_free_rcu(struct rcu_head *head)
 	struct ipoib_neigh __rcu **buckets = htbl->buckets;
 	struct ipoib_neigh_table *ntbl = htbl->ntbl;
 
-	kfree(buckets);
+	kvfree(buckets);
 	kfree(htbl);
 	complete(&ntbl->deleted);
 }