TRACEFS_MAGIC
err = simple_fill_super(sb, TRACEFS_MAGIC, trace_files);
#ifndef TRACEFS_MAGIC
if (find_tracefs_mnt_single(TRACEFS_MAGIC, mnt, *ptr))
if (found && validate_tracefs_mnt(mnt, TRACEFS_MAGIC))
#ifndef TRACEFS_MAGIC
#ifndef TRACEFS_MAGIC