must be active, but we must be able to choose the 4.4@acronym{BSD}
scheduler
with the @option{-mlfqs} kernel option. Passing this
-option sets @code{enable_mlfqs}, declared in @file{threads/init.h}, to
+option sets @code{thread_mlfqs}, declared in @file{threads/thread.h}, to
true when the options are parsed by @func{parse_options}, which happens
midway through @func{main}.