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[IPV4] fib_trie: fix warning from rcu_assign_poinger 

This gets rid of a warning caused by the test in rcu_assign_pointer.
I tried to fix rcu_assign_pointer, but that devolved into a long set
of discussions about doing it right that came to no real solution.
Since the test in rcu_assign_pointer for constant NULL would never
succeed in fib_trie, just open code instead.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
wifi-calibration
Stephen Hemminger 2008-03-22 17:59:58 -07:00 committed by David S. Miller
parent 69d1506731
commit 6440cc9e0f
1 changed files with 5 additions and 2 deletions
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7
net/ipv4/fib_trie.c
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@ -177,10 +177,13 @@ static inline struct tnode *node_parent_rcu(struct node *node)
return rcu_dereference(ret);
}
/* Same as rcu_assign_pointer
* but that macro() assumes that value is a pointer.
*/
static inline void node_set_parent(struct node *node, struct tnode *ptr)
{
rcu_assign_pointer(node->parent,
(unsigned long)ptr | NODE_TYPE(node));
smp_wmb();
node->parent = (unsigned long)ptr | NODE_TYPE(node);
}
static inline struct node *tnode_get_child(struct tnode *tn, unsigned int i)