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);