Index: sys/kern/kern_jail.c
===================================================================
--- sys/kern/kern_jail.c
+++ sys/kern/kern_jail.c
@@ -2286,7 +2286,7 @@
 	 * Kill all processes unfortunate enough to be attached to this prison.
 	 */
 	sx_slock(&allproc_lock);
-	LIST_FOREACH(p, &allproc, p_list) {
+	FOREACH_PROC_IN_SYSTEM(p) {
 		PROC_LOCK(p);
 		if (p->p_state != PRS_NEW && p->p_ucred &&
 		    p->p_ucred->cr_prison == pr)
Index: sys/kern/kern_proc.c
===================================================================
--- sys/kern/kern_proc.c
+++ sys/kern/kern_proc.c
@@ -3176,7 +3176,7 @@
 		}
 	}
 	/*  Did the loop above missed any stopped process ? */
-	LIST_FOREACH(p, &allproc, p_list) {
+	FOREACH_PROC_IN_SYSTEM(p) {
 		/* No need for proc lock. */
 		if ((p->p_flag & P_TOTAL_STOP) != 0)
 			goto again;
Index: sys/kern/subr_kdb.c
===================================================================
--- sys/kern/subr_kdb.c
+++ sys/kern/subr_kdb.c
@@ -580,14 +580,12 @@
 	struct proc *p;
 	struct thread *thr;
 
-	p = LIST_FIRST(&allproc);
-	while (p != NULL) {
+	FOREACH_PROC_IN_SYSTEM(p) {
 		if (p->p_flag & P_INMEM) {
 			thr = FIRST_THREAD_IN_PROC(p);
 			if (thr != NULL)
 				return (thr);
 		}
-		p = LIST_NEXT(p, p_list);
 	}
 	return (NULL);
 }
@@ -597,11 +595,9 @@
 {
 	struct proc *p;
 
-	p = LIST_FIRST(&allproc);
-	while (p != NULL) {
+	FOREACH_PROC_IN_SYSTEM(p) {
 		if (p->p_flag & P_INMEM && p->p_pid == pid)
 			return (FIRST_THREAD_IN_PROC(p));
-		p = LIST_NEXT(p, p_list);
 	}
 	return (NULL);
 }