datapath.c: Use built-in RCU list checking
authorMadhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Tue, 18 Feb 2020 19:58:02 +0000 (01:28 +0530)
committerDavid S. Miller <davem@davemloft.net>
Tue, 18 Feb 2020 20:46:27 +0000 (12:46 -0800)
hlist_for_each_entry_rcu() has built-in RCU and lock checking.

Pass cond argument to list_for_each_entry_rcu() to silence
false lockdep warning when CONFIG_PROVE_RCU_LIST is enabled
by default.

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/openvswitch/datapath.c

index 659c2a7..c047afd 100644 (file)
@@ -179,7 +179,8 @@ struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
        struct hlist_head *head;
 
        head = vport_hash_bucket(dp, port_no);
-       hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
+       hlist_for_each_entry_rcu(vport, head, dp_hash_node,
+                               lockdep_ovsl_is_held()) {
                if (vport->port_no == port_no)
                        return vport;
        }
@@ -2042,7 +2043,8 @@ static unsigned int ovs_get_max_headroom(struct datapath *dp)
        int i;
 
        for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
-               hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
+               hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
+                                       lockdep_ovsl_is_held()) {
                        dev = vport->dev;
                        dev_headroom = netdev_get_fwd_headroom(dev);
                        if (dev_headroom > max_headroom)
@@ -2061,7 +2063,8 @@ static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
 
        dp->max_headroom = new_headroom;
        for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
-               hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
+               hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
+                                       lockdep_ovsl_is_held())
                        netdev_set_rx_headroom(vport->dev, new_headroom);
 }