5042 stop using deprecated atomic functions

*** 291,301 ****
          if (fem_create("portfop_fem",
              (const struct fs_operation_def *)port_vnodesrc_template,
              (fem_t **)&femp)) {
                  return (NULL);
          }
!         if (casptr(&fop_femop, NULL, femp) != NULL) {
                  /*
                   * some other thread beat us to it.
                   */
                  fem_free(femp);
          }
--- 291,301 ----
          if (fem_create("portfop_fem",
              (const struct fs_operation_def *)port_vnodesrc_template,
              (fem_t **)&femp)) {
                  return (NULL);
          }
!         if (atomic_cas_ptr(&fop_femop, NULL, femp) != NULL) {
                  /*
                   * some other thread beat us to it.
                   */
                  fem_free(femp);
          }
*** 309,319 ****
          if (fop_fsemop != NULL)
                  return (fop_fsemop);
          if (fsem_create("portfop_fsem", port_vfssrc_template, &fsemp)) {
                  return (NULL);
          }
!         if (casptr(&fop_fsemop, NULL, fsemp) != NULL) {
                  /*
                   * some other thread beat us to it.
                   */
                  fsem_free(fsemp);
          }
--- 309,319 ----
          if (fop_fsemop != NULL)
                  return (fop_fsemop);
          if (fsem_create("portfop_fsem", port_vfssrc_template, &fsemp)) {
                  return (NULL);
          }
!         if (atomic_cas_ptr(&fop_fsemop, NULL, fsemp) != NULL) {
                  /*
                   * some other thread beat us to it.
                   */
                  fsem_free(fsemp);
          }
*** 1085,1095 ****
              offsetof(portfop_t, pfop_node));
          npvp->pvp_vp = vp;
          /*
           * If v_fopdata is not null, some other thread beat us to it.
           */
!         if (casptr(&vp->v_fopdata, NULL, npvp) != NULL) {
                  mutex_destroy(&npvp->pvp_mutex);
                  list_destroy(&npvp->pvp_pfoplist);
                  kmem_free(npvp, sizeof (*npvp));
          }
  }
--- 1085,1095 ----
              offsetof(portfop_t, pfop_node));
          npvp->pvp_vp = vp;
          /*
           * If v_fopdata is not null, some other thread beat us to it.
           */
!         if (atomic_cas_ptr(&vp->v_fopdata, NULL, npvp) != NULL) {
                  mutex_destroy(&npvp->pvp_mutex);
                  list_destroy(&npvp->pvp_pfoplist);
                  kmem_free(npvp, sizeof (*npvp));
          }
  }