OS-5370 panic in signalfd
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>

*** 8,18 ****
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright 2015 Joyent, Inc.
   */
  
  /*
   * Header file to support the signalfd facility. Note that this facility
   * is designed to be binary compatible with the Linux signalfd facility, modulo
--- 8,18 ----
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright 2016 Joyent, Inc.
   */
  
  /*
   * Header file to support the signalfd facility. Note that this facility
   * is designed to be binary compatible with the Linux signalfd facility, modulo
*** 73,89 ****
  #else
  
  #define SIGNALFDMNRN_SIGNALFD   0
  #define SIGNALFDMNRN_CLONE      1
  
- typedef struct sigfd_wake_list {
-         list_node_t sigfd_wl_lst;
-         void *sigfd_wl_state;
- } sigfd_wake_list_t;
- 
  /*
   * This holds the proc_t state for a process which is using signalfd.
   */
  typedef struct sigfd_proc_state {
          void (*sigfd_pollwake_cb)(void *, int);
          list_t sigfd_list;
  } sigfd_proc_state_t;
--- 73,85 ----
  #else
  
  #define SIGNALFDMNRN_SIGNALFD   0
  #define SIGNALFDMNRN_CLONE      1
  
  /*
   * This holds the proc_t state for a process which is using signalfd.
+  * Its presence and contents are protected by p_lock.
   */
  typedef struct sigfd_proc_state {
          void (*sigfd_pollwake_cb)(void *, int);
          list_t sigfd_list;
  } sigfd_proc_state_t;