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>

*** 19,28 ****
--- 19,29 ----
   * 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   */
  
*** 415,425 ****
  
          if (p->p_proc_flag & P_PR_LOCK)
                  return (1);
  
          p->p_proc_flag |= P_PR_LOCK;
-         THREAD_KPRI_REQUEST();
  
          return (0);
  }
  
  /*
--- 416,425 ----
*** 500,510 ****
          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)
  {
--- 500,509 ----
*** 517,527 ****
          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)
  {
--- 516,525 ----