blk_add_trace_bio_frontmerge 1132 kernel/trace/blktrace.c 	ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL);
blk_add_trace_bio_frontmerge 1162 kernel/trace/blktrace.c 	unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL);