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) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright 2019 Joyent, Inc.
   */
  
  #include <sys/param.h>
  #include <sys/vmparam.h>
  #include <sys/types.h>
*** 1024,1034 ****
  
          /*
           * Try to autoload the system call if necessary.
           */
          module_lock = lock_syscall(se, code);
-         THREAD_KPRI_RELEASE();  /* drop priority given by rw_enter */
  
          /*
           * we've locked either the loaded syscall or nosys
           */
          if (callp->sy_flags & SE_ARGC) {
--- 1025,1034 ----
*** 1038,1048 ****
                  rval = (*sy_call)(a0, a1, a2, a3, a4, a5);
          } else {
                  rval = syscall_ap();
          }
  
-         THREAD_KPRI_REQUEST();  /* regain priority from read lock */
          rw_exit(module_lock);
          return (rval);
  }
  
  /*
--- 1038,1047 ----