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The monolithic hash_lock could cause huge contention when inserting/deletiing vxlan_fdbs into the fdb_head. Use FDB_HASH_SIZE hash_locks to protect insertions/deletions of vxlan_fdbs into the fdb_head hash table. Suggested-by: David S. Miller <davem@davemloft.net> Signed-off-by: Litao jiao <jiaolitao@raisecom.com> Signed-off-by: David S. Miller <davem@davemloft.net>