5042 stop using deprecated atomic functions

*** 2870,2880 ****
          struct fem_head *head;
  
          head = kmem_alloc(sizeof (*head), KM_SLEEP);
          mutex_init(&head->femh_lock, NULL, MUTEX_DEFAULT, NULL);
          head->femh_list = NULL;
!         if (casptr(hp, NULL, head) != NULL) {
                  kmem_free(head, sizeof (*head));
                  head = *hp;
          }
          return (head);
  }
--- 2870,2880 ----
          struct fem_head *head;
  
          head = kmem_alloc(sizeof (*head), KM_SLEEP);
          mutex_init(&head->femh_lock, NULL, MUTEX_DEFAULT, NULL);
          head->femh_list = NULL;
!         if (atomic_cas_ptr(hp, NULL, head) != NULL) {
                  kmem_free(head, sizeof (*head));
                  head = *hp;
          }
          return (head);
  }
*** 3363,3373 ****
                                  fem_unlock(v->v_femhead);
                                  return;
                          }
                          fem_unlock(v->v_femhead);
                  }
!         } while (casptr(&v->v_op, r, newops) != r);
  }
  
  vnodeops_t *
  fem_getvnops(vnode_t *v)
  {
--- 3363,3373 ----
                                  fem_unlock(v->v_femhead);
                                  return;
                          }
                          fem_unlock(v->v_femhead);
                  }
!         } while (atomic_cas_ptr(&v->v_op, r, newops) != r);
  }
  
  vnodeops_t *
  fem_getvnops(vnode_t *v)
  {
*** 3506,3516 ****
                                  fem_unlock(v->vfs_femhead);
                                  return;
                          }
                          fem_unlock(v->vfs_femhead);
                  }
!         } while (casptr(&v->vfs_op, r, newops) != r);
  }
  
  vfsops_t *
  fsem_getvfsops(vfs_t *v)
  {
--- 3506,3516 ----
                                  fem_unlock(v->vfs_femhead);
                                  return;
                          }
                          fem_unlock(v->vfs_femhead);
                  }
!         } while (atomic_cas_ptr(&v->vfs_op, r, newops) != r);
  }
  
  vfsops_t *
  fsem_getvfsops(vfs_t *v)
  {