blk_trace_startstop 539 block/blktrace.c ret = blk_trace_startstop(q, start); blk_trace_startstop 561 block/blktrace.c blk_trace_startstop(q, 0); blk_trace_startstop 322 include/linux/blktrace_api.h extern int blk_trace_startstop(struct request_queue *q, int start);