OS-7753 THREAD_KPRI_RELEASE does nothing of the sort
Reviewed by: Bryan Cantrill <bryan@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

@@ -19,10 +19,11 @@
  * CDDL HEADER END
  */
 
 /*
  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2019 Joyent, Inc.
  */
 
 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
 /*        All Rights Reserved   */
 

@@ -415,11 +416,10 @@
 
         if (p->p_proc_flag & P_PR_LOCK)
                 return (1);
 
         p->p_proc_flag |= P_PR_LOCK;
-        THREAD_KPRI_REQUEST();
 
         return (0);
 }
 
 /*

@@ -500,11 +500,10 @@
         while (p->p_proc_flag & P_PR_LOCK) {
                 cv_wait(&pr_pid_cv[p->p_slot], &p->p_lock);
         }
 
         p->p_proc_flag |= P_PR_LOCK;
-        THREAD_KPRI_REQUEST();
 }
 
 void
 sprunlock(proc_t *p)
 {

@@ -517,11 +516,10 @@
         ASSERT(MUTEX_HELD(&p->p_lock));
 
         cv_signal(&pr_pid_cv[p->p_slot]);
         p->p_proc_flag &= ~P_PR_LOCK;
         mutex_exit(&p->p_lock);
-        THREAD_KPRI_RELEASE();
 }
 
 void
 pid_init(void)
 {