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Commit f23e59fb authored by Alexander Duyck's avatar Alexander Duyck Committed by David S. Miller
Browse files

fib_trie: Move parent from key_vector to tnode 



This change pulls the parent pointer from the key_vector and places it in
the tnode structure.

Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6e22d174

net/ipv4/fib_trie.c

+5 −6
Original line number Diff line number Diff line
@@ -93,8 +93,6 @@ typedef unsigned int t_key; 
#define IS_LEAF(n) (!(n)->bits)



struct key_vector {

	struct key_vector __rcu *parent;



	t_key key;

	unsigned char pos;		/* 2log(KEYLENGTH) bits needed */

	unsigned char bits;		/* 2log(KEYLENGTH) bits needed */
@@ -111,6 +109,7 @@ struct tnode { 
	struct rcu_head rcu;

	t_key empty_children;		/* KEYLENGTH bits needed */

	t_key full_children;		/* KEYLENGTH bits needed */

	struct key_vector __rcu *parent;

	struct key_vector kv[1];

#define tn_bits kv[0].bits

};
@@ -165,21 +164,21 @@ static inline struct tnode *tn_info(struct key_vector *kv) 
}



/* caller must hold RTNL */

#define node_parent(n) rtnl_dereference((n)->parent)

#define node_parent(tn) rtnl_dereference(tn_info(tn)->parent)

#define get_child(tn, i) rtnl_dereference((tn)->tnode[i])



/* caller must hold RCU read lock or RTNL */

#define node_parent_rcu(n) rcu_dereference_rtnl((n)->parent)

#define node_parent_rcu(tn) rcu_dereference_rtnl(tn_info(tn)->parent)

#define get_child_rcu(tn, i) rcu_dereference_rtnl((tn)->tnode[i])



/* wrapper for rcu_assign_pointer */

static inline void node_set_parent(struct key_vector *n, struct key_vector *tp)

{

	if (n)

		rcu_assign_pointer(n->parent, tp);

		rcu_assign_pointer(tn_info(n)->parent, tp);

}



#define NODE_INIT_PARENT(n, p) RCU_INIT_POINTER((n)->parent, p)

#define NODE_INIT_PARENT(n, p) RCU_INIT_POINTER(tn_info(n)->parent, p)



/* This provides us with the number of children in this node, in the case of a

 * leaf this will return 0 meaning none of the children are accessible.