1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/proc.h b/kernel/proc.h
index e86bde1..8e90008 100644
--- a/kernel/proc.h
+++ b/kernel/proc.h
@@ -88,12 +88,14 @@ struct proc {
 
   // p->lock must be held when using these:
   enum procstate state;        // Process state
-  struct proc *parent;         // Parent process
   void *chan;                  // If non-zero, sleeping on chan
   int killed;                  // If non-zero, have been killed
   int xstate;                  // Exit status to be returned to parent's wait
   int pid;                     // Process ID
 
+  // proc_tree_lock must be held when using this:
+  struct proc *parent;         // Parent process
+
   // these are private to the process, so p->lock need not be held.
   uint64 kstack;               // Virtual address of kernel stack
   uint64 sz;                   // Size of process memory (bytes)