re #13613 rb4516 Tunables needs volatile keyword

@@ -20,16 +20,17 @@
  */
 /*
  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
+/*
+ * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
+ */
 
 #ifndef _SYS_RCTL_IMPL_H
 #define _SYS_RCTL_IMPL_H
 
-#pragma ident   "%Z%%M% %I%     %E% SMI"
-
 #include <sys/rctl.h>
 #include <sys/time.h>
 #include <sys/types.h>
 
 #ifdef  __cplusplus

@@ -57,12 +58,12 @@
         int             rcq_local_signal;
         id_t            rcq_local_recipient_pid;
         hrtime_t        rcq_firing_time;
 } rctl_opaque_t;
 
-extern uint_t rlim_fd_cur;
-extern uint_t rlim_fd_max;
+extern volatile uint_t rlim_fd_cur;
+extern volatile uint_t rlim_fd_max;
 
 /* Given an array of rctlblk_t calculate the address of the n'th element */
 #define RCTLBLK_INC(blk, n)     (rctlblk_t *)(((char *)blk) \
         + (n * rctlblk_size()))