linux内核计算时间差

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bool BTime=0;int tmp;struct timeval stime,etime;if(BTime == 0){do_gettimeofday(&stime);BTime = 1;}XXXXXXXXXXXif(wc->BTime == 1){do_gettimeofday(&etime);tmp = (etime.tv_sec - stime.tv_sec)*1000000 + (etime.tv_usec - stime.tv_usec);  //tmp即为时间差BTime = 0;}printk(" Timer is %d us\n",tmp);