>> Thanks,
>> Jarek P.
>> ----------> (synchronize take 6 all-in-one for 2.6.29x, .28, or .27)
>>
>> diff -Nurp a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
>> --- a/net/ipv4/fib_trie.c 2009-06-29 05:30:50.000000000 +0000
>> +++ b/net/ipv4/fib_trie.c 2009-07-01 05:15:37.000000000 +0000
>> @@ -123,6 +123,7 @@ struct tnode {
>> union {
>> struct rcu_head rcu;
>> struct work_struct work;
>> + struct tnode *tnode_free;
>> };
>> struct node *child[0];
>> };
>> @@ -161,6 +162,8 @@ static void tnode_put_child_reorg(struct
>> static struct node *resize(struct trie *t, struct tnode *tn);
>> static struct tnode *inflate(struct trie *t, struct tnode *tn);
>> static struct tnode *halve(struct trie *t, struct tnode *tn);
>> +/* tnodes to free after resize(); protected by RTNL */
>> +static struct tnode *tnode_free_head;
>>
>> static struct kmem_cache *fn_alias_kmem __read_mostly;
>> static struct kmem_cache *trie_leaf_kmem __read_mostly;
>> @@ -385,6 +388,24 @@ static inline void tnode_free(struct tno
>> call_rcu(&tn->rcu, __tnode_free_rcu);
>> }
>>
>> +static void tnode_free_safe(struct tnode *tn)
>> +{
>> + BUG_ON(IS_LEAF(tn));
>> + tn->tnode_free = tnode_free_head;
>> + tnode_free_head = tn;
>> +}
>> +
>> +static void tnode_free_flush(void)
>> +{
>> + struct tnode *tn;
>> +
>> + while ((tn = tnode_free_head)) {
>> + tnode_free_head = tn->tnode_free;
>> + tn->tnode_free = NULL;
>> + tnode_free(tn);
>> + }
>> +}
>> +
>> static struct leaf *leaf_new(void)
>> {
>> struct leaf *l = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL);
>> @@ -495,7 +516,7 @@ static struct node *resize(struct trie *
>>
>> /* No children */
>> if (tn->empty_children == tnode_child_length(tn)) {
>> - tnode_free(tn);
>> + tnode_free_safe(tn);
>> return NULL;
>> }
>> /* One child */
>> @@ -509,7 +530,7 @@ static struct node *resize(struct trie *
>>
>> /* compress one level */
>> node_set_parent(n, NULL);
>> - tnode_free(tn);
>> + tnode_free_safe(tn);
>> return n;
>> }
>> /*
>> @@ -670,7 +691,7 @@ static struct node *resize(struct trie *
>> /* compress one level */
>>
>> node_set_parent(n, NULL);
>> - tnode_free(tn);
>> + tnode_free_safe(tn);
>> return n;
>> }
>>
>> @@ -756,7 +777,7 @@ static struct tnode *inflate(struct trie
>> put_child(t, tn, 2*i, inode->child[0]);
>> put_child(t, tn, 2*i+1, inode->child[1]);
>>
>> - tnode_free(inode);
>> + tnode_free_safe(inode);
>> continue;
>> }
>>
>> @@ -801,9 +822,9 @@ static struct tnode *inflate(struct trie
>> put_child(t, tn, 2*i, resize(t, left));
>> put_child(t, tn, 2*i+1, resize(t, right));
>>
>> - tnode_free(inode);
>> + tnode_free_safe(inode);
>> }
>> - tnode_free(oldtnode);
>> + tnode_free_safe(oldtnode);
>> return tn;
>> nomem:
>> {
>> @@ -885,7 +906,7 @@ static struct tnode *halve(struct trie *
>> put_child(t, newBinNode, 1, right);
>> put_child(t, tn, i/2, resize(t, newBinNode));
>> }
>> - tnode_free(oldtnode);
>> + tnode_free_safe(oldtnode);
>> return tn;
>> nomem:
>> {
>> @@ -983,12 +1004,14 @@ fib_find_node(struct trie *t, u32 key)
>> return NULL;
>> }
>>
>> -static struct node *trie_rebalance(struct trie *t, struct tnode *tn)
>> +static void trie_rebalance(struct trie *t, struct tnode *tn, bool sync)
>> {
>> int wasfull;
>> - t_key cindex, key = tn->key;
>> + t_key cindex, key;
>> struct tnode *tp;
>>
>> + key = tn->key;
>> +
>> while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) {
>> cindex = tkey_extract_bits(key, tp->pos, tp->bits);
>> wasfull = tnode_full(tp, tnode_get_child(tp, cindex));
>> @@ -999,6 +1022,10 @@ static struct node *trie_rebalance(struc
>>
>> tp = node_parent((struct node *) tn);
>> if (!tp)
>> + rcu_assign_pointer(t->trie, (struct node *)tn);
>> +
>> + //tnode_free_flush();
>> + if (!tp)
>> break;
>> tn = tp;
>> }
>> @@ -1007,7 +1034,12 @@ static struct node *trie_rebalance(struc
>> if (IS_TNODE(tn))
>> tn = (struct tnode *)resize(t, (struct tnode *)tn);
>>
>> - return (struct node *)tn;
>> + rcu_assign_pointer(t->trie, (struct node *)tn);
>> + if (sync)
>> + synchronize_rcu();
>> + tnode_free_flush();
>> +
>> + return;
>> }
>>
>> /* only used from updater-side */
>> @@ -1155,7 +1187,7 @@ static struct list_head *fib_insert_node
>>
>> /* Rebalance the trie */
>>
>> - rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
>> + trie_rebalance(t, tp, true);
>> done:
>> return fa_head;
>> }
>> @@ -1575,7 +1607,7 @@ static void trie_leaf_remove(struct trie
>> if (tp) {
>> t_key cindex = tkey_extract_bits(l->key, tp->pos, tp->bits);
>> put_child(t, (struct tnode *)tp, cindex, NULL);
>> - rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
>> + trie_rebalance(t, tp, false);
>> } else
>> rcu_assign_pointer(t->trie, NULL);
>>
>>
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