6345 remove xhat support

@@ -3854,11 +3854,10 @@
         anon_sync_obj_t an_cookie;
         enum seg_rw arw;
         int alloc_failed = 0;
         int adjszc_chk;
         struct vattr va;
-        int xhat = 0;
         page_t *pplist;
         pfn_t pfn;
         int physcontig;
         int upgrdfail;
         int segvn_anypgsz_vnode = 0; /* for now map vnode with 2 page sizes */

@@ -3904,14 +3903,10 @@
         } else {
                 prot = svd->prot;
                 /* caller has already done segment level protection check. */
         }
 
-        if (seg->s_as->a_hat != hat) {
-                xhat = 1;
-        }
-
         if (rw == S_WRITE && segtype == MAP_PRIVATE) {
                 SEGVN_VMSTAT_FLTVNPAGES(2);
                 arw = S_READ;
         } else {
                 arw = rw;

@@ -4263,29 +4258,13 @@
                                 if (PP_ISMIGRATE(ppa[0])) {
                                         page_migrate(seg, a, ppa, pages);
                                 }
                                 SEGVN_UPDATE_MODBITS(ppa, pages, rw,
                                     prot, vpprot);
-                                if (!xhat) {
                                         hat_memload_array_region(hat, a, pgsz,
                                             ppa, prot & vpprot, hat_flag,
                                             svd->rcookie);
-                                } else {
-                                        /*
-                                         * avoid large xhat mappings to FS
-                                         * pages so that hat_page_demote()
-                                         * doesn't need to check for xhat
-                                         * large mappings.
-                                         * Don't use regions with xhats.
-                                         */
-                                        for (i = 0; i < pages; i++) {
-                                                hat_memload(hat,
-                                                    a + (i << PAGESHIFT),
-                                                    ppa[i], prot & vpprot,
-                                                    hat_flag);
-                                        }
-                                }
 
                                 if (!(hat_flag & HAT_LOAD_LOCK)) {
                                         for (i = 0; i < pages; i++) {
                                                 page_unlock(ppa[i]);
                                         }

@@ -4335,11 +4314,11 @@
 
                         /*
                          * check if we should use smallest mapping size.
                          */
                         upgrdfail = 0;
-                        if (szc == 0 || xhat ||
+                        if (szc == 0 ||
                             (pszc >= szc &&
                             !IS_P2ALIGNED(pfn, pages)) ||
                             (pszc < szc &&
                             !segvn_full_szcpages(ppa, szc, &upgrdfail,
                             &pszc))) {

@@ -4367,11 +4346,11 @@
                                                 ANON_LOCK_EXIT(&amp->a_rwlock);
                                         }
                                         ierr = -1;
                                         break;
                                 }
-                                if (szc != 0 && !xhat && !upgrdfail) {
+                                if (szc != 0 && !upgrdfail) {
                                         segvn_faultvnmpss_align_err5++;
                                 }
                                 SEGVN_VMSTAT_FLTVNPAGES(34);
                                 if (pplist != NULL) {
                                         page_free_replacement_page(pplist);