net/core/failover.c:225:4: error: call to undeclared function 'netdev_lock_ops'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
net/core/failover.c:227:4: error: call to undeclared function 'netdev_unlock_ops'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]