diff --git a/kernel/proc.c b/kernel/proc.c
index 44bacc2..ade12d9 100644
--- a/kernel/proc.c
+++ b/kernel/proc.c
@@ -6,16 +6,15 @@
 #include "proc.h"
 #include "defs.h"
 
-struct {
-  struct spinlock lock;
-  struct proc proc[NPROC];
-} ptable;
+struct proc proc[NPROC];
 
 struct cpu cpus[NCPU];
 
 struct proc *initproc;
 
+struct spinlock pid_lock;
 int nextpid = 1;
+
 extern void forkret(void);
 
 // for returning  out of the kernel
@@ -30,8 +29,8 @@ procinit(void)
 {
   struct proc *p;
   
-  initlock(&ptable.lock, "ptable");
-  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++)
+  initlock(&pid_lock, "nextpid");
+  for(p = proc; p < &proc[NPROC]; p++)
       initlock(&p->lock, "proc");
 }
 
@@ -68,9 +67,9 @@ int
 allocpid() {
   int pid;
   
-  acquire(&ptable.lock);
+  acquire(&pid_lock);
   pid = nextpid++;
-  release(&ptable.lock);
+  release(&pid_lock);
   return pid;
 }
 
@@ -85,7 +84,7 @@ allocproc(void)
 {
   struct proc *p;
 
-  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++) {
+  for(p = proc; p < &proc[NPROC]; p++) {
     acquire(&p->lock);
     if(p->state == UNUSED) {
       goto found;
@@ -297,7 +296,7 @@ reparent(struct proc *p, struct proc *parent) {
   struct proc *pp;
   int child_of_init = (p->parent == initproc);
 
-  for(pp = ptable.proc; pp < &ptable.proc[NPROC]; pp++){
+  for(pp = proc; pp < &proc[NPROC]; pp++){
     if (pp != p && pp != parent) {
       acquire(&pp->lock);
       if(pp->parent == p){
@@ -375,7 +374,7 @@ wait(void)
   for(;;){
     // Scan through table looking for exited children.
     havekids = 0;
-    for(np = ptable.proc; np < &ptable.proc[NPROC]; np++){
+    for(np = proc; np < &proc[NPROC]; np++){
       if(np->parent != p)
         continue;
       acquire(&np->lock);
@@ -421,7 +420,7 @@ scheduler(void)
     // Enable interrupts on this processor.
     intr_on();
 
-    for(p = ptable.proc; p < &ptable.proc[NPROC]; p++) {
+    for(p = proc; p < &proc[NPROC]; p++) {
       acquire(&p->lock);
       if(p->state == RUNNABLE) {
         // Switch to chosen process.  It is the process's job
@@ -557,7 +556,7 @@ wakeup(void *chan)
 {
   struct proc *p;
 
-  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++) {
+  for(p = proc; p < &proc[NPROC]; p++) {
     acquire(&p->lock);
     if(p->state == SLEEPING && p->chan == chan) {
       p->state = RUNNABLE;
@@ -574,7 +573,7 @@ kill(int pid)
 {
   struct proc *p;
 
-  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+  for(p = proc; p < &proc[NPROC]; p++){
     if(p->pid == pid){
       acquire(&p->lock);
       if(p->pid != pid)
@@ -637,7 +636,7 @@ procdump(void)
   struct proc *p;
   char *state;
 
-  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+  for(p = proc; p < &proc[NPROC]; p++){
     if(p->state == UNUSED)
       continue;
     if(p->state >= 0 && p->state < NELEM(states) && states[p->state])