re #13613 rb4516 Tunables needs volatile keyword

*** 20,35 ****
   */
  /*
   * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  #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
--- 20,36 ----
   */
  /*
   * 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
  
  #include <sys/rctl.h>
  #include <sys/time.h>
  #include <sys/types.h>
  
  #ifdef  __cplusplus
*** 57,68 ****
          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;
  
  /* 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()))
  
--- 58,69 ----
          int             rcq_local_signal;
          id_t            rcq_local_recipient_pid;
          hrtime_t        rcq_firing_time;
  } rctl_opaque_t;
  
! 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()))