BUGS

runoff.list:
	bootmain.c missing

mmu.h:
	funny \ alignment in mmu.h

main.c:
	should use static int bcpu to avoid having live
	stack variable across the asm volatile that 
	changes %esp and %ebp.

	cpus[0] -> cpus[bcpu]

init.c:
	should while(wait() >= 0);
	not just wait();

proc.c:
	comment at top of scheduler() should say
		via longjmp back to the scheduler
	not
		via longjmp back to the top of scheduler

	sched should panic if state == RUNNING.

	forkret comment should say "Return" not "return"
	
	as a consequence of the implementation of proc_kill,
	any loop calling sleep should check for p->killed
	and be able to break out with an error return.

	can swap procdump up after proc_kill
	and then have proc_exit and proc_wait on same sheet

	proc_exit should wake up proc[1] if any
	reparenting was done.

	sched ->  switch2scheduler?  or just switch?

trap.c
	if spin locks are ever held without cli,
	trap should call yield() only if nlock == 0

main.c, proc.c, trap.c:
	use a constant for 3 (USER).