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) 1992, 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>
*** 1200,1210 ****
  
          /*
           * 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
           */
  
--- 1201,1210 ----
*** 1232,1242 ****
                  } else {
                          rval = syscall_ap();
                  }
          }
  
-         THREAD_KPRI_REQUEST();  /* regain priority from read lock */
          rw_exit(module_lock);
          return (rval);
  }
  
  /*
--- 1232,1241 ----