8634 epoll fails to wake on certain edge-triggered conditions
8635 epoll should not emit POLLNVAL
8636 recursive epoll should emit EPOLLRDNORM
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Igor Kozhukhov <igor@dilos.org>

*** 21,30 ****
--- 21,31 ----
  /*
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   * Copyright 2012 Milan Jurik. All rights reserved.
   * Copyright (c) 2016 by Delphix. All rights reserved.
+  * Copyright 2017 Joyent, Inc.
   */
  
  
  /*
   * Overview of the RSM Kernel Agent:
*** 2417,2429 ****
          return (e);
  }
  
  static void
  rsm_remap_local_importers(rsm_node_id_t src_nodeid,
!     rsm_memseg_id_t ex_segid,
!     ddi_umem_cookie_t cookie)
! 
  {
          rsmresource_t   *p = NULL;
          rsmhash_table_t *rhash = &rsm_import_segs;
          uint_t          index;
  
--- 2418,2428 ----
          return (e);
  }
  
  static void
  rsm_remap_local_importers(rsm_node_id_t src_nodeid,
!     rsm_memseg_id_t ex_segid, ddi_umem_cookie_t cookie)
  {
          rsmresource_t   *p = NULL;
          rsmhash_table_t *rhash = &rsm_import_segs;
          uint_t          index;
  
*** 3642,3655 ****
   *
   * Will also be called from rsm_rebind with disconnect_flag FALSE.
   *
   */
  static void
! rsm_force_unload(rsm_node_id_t src_nodeid,
!     rsm_memseg_id_t ex_segid,
      boolean_t disconnect_flag)
- 
  {
          rsmresource_t   *p = NULL;
          rsmhash_table_t *rhash = &rsm_import_segs;
          uint_t          index;
          DBG_DEFINE(category,
--- 3641,3652 ----
   *
   * Will also be called from rsm_rebind with disconnect_flag FALSE.
   *
   */
  static void
! rsm_force_unload(rsm_node_id_t src_nodeid, rsm_memseg_id_t ex_segid,
      boolean_t disconnect_flag)
  {
          rsmresource_t   *p = NULL;
          rsmhash_table_t *rhash = &rsm_import_segs;
          uint_t          index;
          DBG_DEFINE(category,
*** 6760,6770 ****
          DBG_PRINTF((category, RSM_DEBUG_VERBOSE, "rsm_disconnect done\n"));
  
          return (DDI_SUCCESS);
  }
  
- /*ARGSUSED*/
  static int
  rsm_chpoll(dev_t dev, short events, int anyyet, short *reventsp,
      struct pollhead **phpp)
  {
          minor_t         rnum;
--- 6757,6766 ----
*** 6782,6802 ****
          if ((res == NULL) || (res == RSMRC_RESERVED) ||
              (res->rsmrc_type == RSM_RESOURCE_BAR)) {
                  return (ENXIO);
          }
  
-         *reventsp = 0;
- 
          /*
           * An exported segment must be in state RSM_STATE_EXPORT; an
           * imported segment must be in state RSM_STATE_ACTIVE.
           */
          seg = (rsmseg_t *)res;
  
          if (seg->s_pollevent) {
                  *reventsp = POLLRDNORM;
!         } else if (!anyyet) {
                  /* cannot take segment lock here */
                  *phpp = &seg->s_poll;
                  seg->s_pollflag |= RSM_SEGMENT_POLL;
          }
          DBG_PRINTF((category, RSM_DEBUG_VERBOSE, "rsm_chpoll done\n"));
--- 6778,6800 ----
          if ((res == NULL) || (res == RSMRC_RESERVED) ||
              (res->rsmrc_type == RSM_RESOURCE_BAR)) {
                  return (ENXIO);
          }
  
          /*
           * An exported segment must be in state RSM_STATE_EXPORT; an
           * imported segment must be in state RSM_STATE_ACTIVE.
           */
          seg = (rsmseg_t *)res;
  
          if (seg->s_pollevent) {
                  *reventsp = POLLRDNORM;
!         } else {
!                 *reventsp = 0;
!         }
! 
!         if ((*reventsp == 0 && !anyyet) || (events & POLLET)) {
                  /* cannot take segment lock here */
                  *phpp = &seg->s_poll;
                  seg->s_pollflag |= RSM_SEGMENT_POLL;
          }
          DBG_PRINTF((category, RSM_DEBUG_VERBOSE, "rsm_chpoll done\n"));