zero_page_patch

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 817a875..fe1a16b 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -804,30 +804,33 @@ int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
                return VM_FAULT_OOM;
        if (unlikely(khugepaged_enter(vma, vma->vm_flags)))
                return VM_FAULT_OOM;
-       if (!(flags & FAULT_FLAG_WRITE) && !mm_forbids_zeropage(mm) &&
-                       transparent_hugepage_use_zero_page()) {
+       if (!(flags & FAULT_FLAG_WRITE) && !mm_forbids_zeropage(mm)) {
                spinlock_t *ptl;
                pgtable_t pgtable;
                struct page *zero_page;
-               bool set;
+               /* bool set; */
                pgtable = pte_alloc_one(mm, haddr);
+               pr_info("read-fault, vm_start = %04lx\n", vma->vm_start);
                if (unlikely(!pgtable))
                        return VM_FAULT_OOM;
-               zero_page = get_huge_zero_page();
+               /* zero_page = get_huge_zero_page(); */
+               zero_page = get_zeroed_page(GFP_KERNEL);
+               pr_info("zero-page allocated\n");
                if (unlikely(!zero_page)) {
                        pte_free(mm, pgtable);
                        count_vm_event(THP_FAULT_FALLBACK);
                        return VM_FAULT_FALLBACK;
                }
                ptl = pmd_lock(mm, pmd);
-               set = set_huge_zero_page(pgtable, mm, vma, haddr, pmd,
-                               zero_page);
+               /*set = set_huge_zero_page(pgtable, mm, vma, haddr, pmd,
+                               zero_page); */
                spin_unlock(ptl);
-               if (!set) {
+               /*if (!set) {
                        pte_free(mm, pgtable);
                        put_huge_zero_page();
-               }
-               return 0;
+               }*/
+               /* return 0; */
+               return VM_FAULT_FALLBACK;
        }
        page = alloc_hugepage_vma(transparent_hugepage_defrag(vma),
                        vma, haddr, numa_node_id(), 0);
diff --git a/mm/memory.c b/mm/memory.c
index 54f3a9b..5259d2f 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -756,8 +756,13 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
                        goto check_pfn;
                if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
                        return NULL;
-               if (!is_zero_pfn(pfn))
+               if (!is_zero_pfn(pfn)) {
+                       pr_info("vm_start = %04lx, !is_zero_pfn, have_pte_special, pid = %d\n", vma->vm_start, current->pid);
                        print_bad_pte(vma, addr, pte, NULL);
+                       pr_info("printed zero page\n");
+               } else {
+                       pr_info("vm_start = %04lx, is_zero_pfn, have_pte_special, pid = %d\n",vma->vm_start, current->pid);
+               }
                return NULL;
        }

@@ -778,8 +783,10 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
                }
        }

-       if (is_zero_pfn(pfn))
+       if (is_zero_pfn(pfn)) {
+               pr_info("vm_start = %04lx, is_zero_pfn, don't have pte special, pid = %d\n", vma->vm_start, current->pid);
                return NULL;
+       }
 check_pfn:
        if (unlikely(pfn > highest_memmap_pfn)) {
                print_bad_pte(vma, addr, pte, NULL);