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>

*** 20,30 ****
   */
  
  /*
   * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
!  * Copyright 2012 Joyent, Inc.  All rights reserved.
   */
  
  #ifndef _SYS_FSS_H
  #define _SYS_FSS_H
  
--- 20,30 ----
   */
  
  /*
   * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
!  * Copyright 2019 Joyent, Inc.
   */
  
  #ifndef _SYS_FSS_H
  #define _SYS_FSS_H
  
*** 158,168 ****
  #define FSSPROJ2FSSZONE(fssx)   ((fssx)->fssp_fsszone)
  
  /*
   * fss_flags
   */
! #define FSSKPRI         0x01    /* the thread is in kernel mode */
  #define FSSBACKQ        0x02    /* thread should be placed at the back of */
                                  /* the dispatch queue if preempted */
  #define FSSRESTORE      0x04    /* thread was not preempted, due to schedctl */
                                  /* restore priority from fss_scpri */
  
--- 158,168 ----
  #define FSSPROJ2FSSZONE(fssx)   ((fssx)->fssp_fsszone)
  
  /*
   * fss_flags
   */
! /* Formerly: FSSKPRI    0x01 - the thread is in kernel mode */
  #define FSSBACKQ        0x02    /* thread should be placed at the back of */
                                  /* the dispatch queue if preempted */
  #define FSSRESTORE      0x04    /* thread was not preempted, due to schedctl */
                                  /* restore priority from fss_scpri */