net: disable preemption before call smp_processor_id()
Although netif_rx() isn't expected to be called in process context with preemption enabled, it'd better handle this case. And this is why get_cpu() is used in the non-RPS #ifdef branch. If tree RCU is selected, rcu_read_lock() won't disable preemption, so preempt_disable() should be called explictly. Signed-off-by: NChangli Gao <xiaosuo@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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