+int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long address, int write_access)
+{
+ pte_t *ptep;
+ pte_t entry;
+ int ret;
+
+ ptep = huge_pte_alloc(mm, address);
+ if (!ptep)
+ return VM_FAULT_OOM;
+
+ entry = *ptep;
+ if (pte_none(entry))
+ return hugetlb_no_page(mm, vma, address, ptep, write_access);
+
+ ret = VM_FAULT_MINOR;
+
+ spin_lock(&mm->page_table_lock);
+ /* Check for a racing update before calling hugetlb_cow */
+ if (likely(pte_same(entry, *ptep)))
+ if (write_access && !pte_write(entry))
+ ret = hugetlb_cow(mm, vma, address, ptep, entry);
+ spin_unlock(&mm->page_table_lock);
+
+ return ret;
+}
+