13902 Fix for 13717 may break 8-disk raidz2
13915 installctx() blocking allocate causes problems
Portions contributed by: Jerry Jelinek <gjelinek@gmail.com>
Change-Id: I934d69946cec42630fc541fa8c7385b862b69ca2

@@ -19,10 +19,11 @@
  * CDDL HEADER END
  */
 
 /*
  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2021 Joyent, Inc.
  */
 
 #include <sys/param.h>
 #include <sys/thread.h>
 #include <sys/cpuvar.h>

@@ -316,11 +317,11 @@
 
         /*
          * Add a device context to the subject thread.
          */
         installctx(t, ctx, kcpc_save, kcpc_restore, NULL,
-            kcpc_lwp_create, NULL, kcpc_free);
+            kcpc_lwp_create, NULL, kcpc_free, NULL);
 
         /*
          * Ask the backend to program the hardware.
          */
         if (t == curthread) {

@@ -1422,11 +1423,11 @@
                 ttolwp(ct)->lwp_pcb.pcb_flags |= CPC_OVERFLOW;
                 aston(ct);
         }
 
         installctx(ct, cctx, kcpc_save, kcpc_restore,
-            NULL, kcpc_lwp_create, NULL, kcpc_free);
+            NULL, kcpc_lwp_create, NULL, kcpc_free, NULL);
 }
 
 /*
  * Counter Stoppage Theory
  *