blk_add_trace_sleeprq 1138 kernel/trace/blktrace.c 	ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL);
blk_add_trace_sleeprq 1159 kernel/trace/blktrace.c 	unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL);